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Compare null with null in java

While working in Java projects I sometimes used to see my colleagues writing code for null comparison as I used to wonder why would someone compare `null` with object rather than object with `null The compareTo () method of the String class two Strings (char by char) it also accepts null values. This method returns an integer representing the result, if the value of the obtained integer is −. 0: Given two Strings are equal or, null. 1 or less: The current String preceeds the argument Finally, two null references are considered to be the same, while any non-null object will be considered different from null: assertThat(null == null).isTrue(); assertThat(Hello! == null).isFalse(); Of course, the behavior of the equality operators can be limiting. What if we want to compare two objects mapped to different addresses and yet. The nullsFirst (java.util.Comparator) method returns comparator that is a null-friendly comparator and considers null values to be less than non-null. The null first operates by the following logic: The null element is considered to be less than non-null. When both elements are null, then they are considered equal

Now back to the question. If you do have what you said (eg both null is 0, both not null is 1 etc). then to me you are making a NullComparator rather than checking for null. If both objects are null surely they are equal! Both not null then you surely need to compare the attributes of those objects. If either is null, -1 or 1 doesn't matter. if C object having null value then following statement used to compare null value: if (c.toString() == null) { System.out.println(hello execute statement); } share | improve this answer | follow Compare Two Strings in Java - equals, compareTo() methods; Search String in Another String in Java - indexOf, lastIndexOf, contains methods; Java Program to Count The Frequency of Each Character in a String; JShell in Java; Wrapper Class in Java; That's all for the topic Check if a String is Null or Empty in Java. If something is missing. undefined and null are very similar, but they generally mean two very different things. Usually undefined is the result when something has had no value assigned to it, whereas null has a value, and the value is explicitly set to nothing prints null instead of ; If this is written to a file and subsequently read back in, suddenly the String is null instead of null (or , depending on how things get read in). Piscis Babelis est parvus, flavus, et hiridicus, et est probabiliter insolitissima raritas in toto mundo

Java NULL comparison

  1. Wenn ein Nachname nun null sein sollte wirft die compareTo() Methode eine NullPointerException! ↑ Nach oben. Das Interface Comparator (Comparator-Objekt) Der Vergleich mit der Methode compareTo() im InterfaceComparable im obigen Beispiel hat ein Problem: wie verglichen wird ist fix festgelegt. Möchte man nun nicht aufsteigend, sondern absteigend oder nach dem Vornamen sortieren funktioniert.
  2. A null indicates that a variable doesn't point to any object and holds no value. You can use a basic 'if' statement to check a null in a piece of code. Null is commonly used to denote or verify the non-existence of something. Within that..
  3. safe - java compare null . Wie vereinfacht man eine null-sichere compareTo() Implementierung? (11) Dies ist meine Implementierung, die ich zum Sortieren meiner ArrayList verwende. Die Null-Klassen sind auf den letzten sortiert. Für meinen Fall erweitert EntityPhone EntityAbstract und mein Container ist List <EntityAbstract>..

Comparing Strings with (possible) null values in java

it is possible to handle null pointer exception using Comparator.comparing static method. If you want to comparing loanAmount fields in your objects and you want that every not null value is greater than null you can use Comparator.nullFirst method in combination with Comparator.comparing like the below code:. Comparator.comparing(LoanAccount::getLoanAmount, Comparator.nullsFirst(Comparator. Comparator should handle null values and treat null as last in sorting. Comparator should first compare based on name in ascending order. If names are same, then it should compare based on age. Before Java 8: Before Java 8, comparator will look something like below which satisfied all conditions above The compareTo() method returns an int type value and compares two Strings character by character lexicographically based on a dictionary or natural ordering.. This method returns 0 if two Strings are equal or if both are null, a negative number if the first String comes before the argument, and a number greater than zero if the first String comes after the argument String Checking object is null or not: Here, we are going to learn how to check an object is null or not in Java? Submitted by Preeti Jain, on July 03, 2019 . With the help of == operator is useful for reference comparison and it compares two objects. == operator returns true if both references (objects) points to the same memory location otherwise it will return false if both objects point to. Comparing Long Values in Java. Last modified: August 13, 2020. by Antonio Manuel Moreno Delgado. Java + I just announced the new Learn Spring course, focused on the fundamentals of Spring 5 and Spring Boot 2: >> CHECK OUT THE COURSE. 1. Overview. In this short tutorial, we'll discuss different ways to compare two Long instances. We emphasize the problems that arise when using the reference.

Comparing Objects in Java Baeldun

  1. How to Compare Two Objects in Java. Java Object class is the super class of all the Java classes. All Java classes implements the Object class by default. The Java Object class provides the two important methods to compare two objects in Java, i.e. equals() and hashCode() method. In this section, we will learn how equals() and hashCode() method works. Along with this, we will also learn how to.
  2. e the order. If the specified comparator is null, then the returned comparator considers all non-null values to be equal.. The returned comparator is serializable if the specified comparator is serializable
  3. Javaのnullは何ですか? Java ResultSetからのnull int値の確認. ジャクソン対。 Gson. nullと空( )のJava文字列の違い. ボックス化されたLong値127と128の比較. IntelliJ IDEAを使用してすべての未使用コードを見つける方法. Java内の2つのオブジェクトを、可能なヌル値と.

Comparator nullsFirst() method in Java with examples

Difference between Null and Undefined Null. Null is used to represent an intentional absence of value. It represents a variable whose value is undefined. It accepts only one value, which is null. The Null keyword is used to define the Null type in TypeScript, but it is not useful because we can only assign a null value to it. Exampl The Java String compareTo() method is used for comparing two strings lexicographically. Each character of both the strings is converted into a Unicode value for comparison. If both the strings are equal then this method returns 0 else it returns positive or negative value. The result is positive if the first string is lexicographically greater than the second string else the result would be. In java, null is literal. It is the same as true or false. It has a special meaning. Many people confuse it with an identifier or a keyword. Important Facts about Null. There are some facts that are essential to know when you are working with null in Java. Null is case-sensitive in nature. This means that you cannot expect NULL to be a. I need help, i can't figure this one out, i have a code that will check for null values, i can't seem to catch it though. Also, what's the best way to test for null

Handling null values in Comparator (Java in General forum

Comparator.nullsLast method introduced in Java 8, returns a null-friendly comparator that considers null to be greater than non-null. Find its declaration from Java source code. Find the working of the comparator returned by nullsLast method. 1. The null element is considered to be greater than non-null. 2 I would like a review of how I am comparing two java.util.String in a private method in a java.util.Comparator.Either of the Strings could be null or blank, and would be less than the other String if that other String were not null/blank.. My gut feeling is that this is at the very least inelegant, probably difficult to read, and at worst inefficient if it had to be done millions of times.

From Java 11 onward there is also isBlank() method to check if the String is empty or contains only white spaces. Check String empty or null using isEmpty() In order to check if String empty or null in Java you should first check whether the String is null or not then check if it is empty or not. If you use or condition (||) then second part is not evaluated if the first part itself is true, so you won't be calling isEmpty() method on a null String if String itself is null Dort muss man den Sonderfall der null-Referenz als Argument von equals() explizit abfangen, weil der equals()-Contract verlangt, dass der Vergleich mit null immer false liefern muss. equals() ist deshalb in der Behandlung von null-Referenzen nicht symmetrisch: o.equals(null) muss false liefern, wohingegen null.equals(o) eine NullPointerException auslöst. compareTo() hingegen ist auch für null-Referenzen symmetrisch und wirft in beiden Fällen eine NullPointerException So when it comes to null and undefined: console.log(null == undefined); // true console.log(null === undefined); // false. Yes, null is equal to undefined in the sense they both have a nothing value, but they are of different data types. Interestingly though, when it comes comparing to an empty string Java Forum; compare a float with NULL. thread269-77384. Forum: Search: FAQs: Links: MVPs: Menu. compare a float with NULL compare a float with NULL tyris (Programmer) (OP) 27 Apr 01 05:00. if i want to compare this float with a NULL value ? i mean : i do have a float in an object: myObj.Myfloat if i do ( myObj.Myfloat.equals(NULL) it tels me that NULL is not defined . Best regards , Elise . RE.

java - compare an object to null! - Stack Overflo

  1. How compare() method works in Java; Comparator Interface in Java with Examples; Interesting facts about null in Java; Using _ (underscore) as variable name in Java; Currying Functions in Java with Examples; Using underscore in Numeric Literals in Java; Binary Search in Java; Sorting in Java; Arrays.sort() in Java with example
  2. The sort() method will call compareTo() on objects in the list without checking for null first. You have two basic choices - either remove the nulls from the list (maybe re-adding them later after the list is sorted, if you really want to have them there) - or sort the list yourslef, without using Collections.sort(). There are many algorithms books which describe techniques for doing this, if.
  3. For natural order, the element class needs to implement Comparable and override compareTo method. All null elements will be first in order and non-null elements will be in its natural order. Case-6: In this case we are passing null to nullsFirst method. As we know that if specified comparator to nullsFirst is null, then the returned comparator considers all non-null elements equal. All the.
  4. I want to compare two strings for equality in Java, when either or both could be null, so I cannot simply call .equals(). What is the best way
  5. The biggest reason where = NULL will shoot you in the foot is this, SQL 7 when shipped and installed is defaulted to ANSI_NULL OFF but SQL 2000 is defaulted to ANSI_NULL ON. Of course you can.
  6. g in Java, I considered the null value my enemy and I dreaded NullPointerExceptions, which happened fairly often to me. Over time, I learned to work with it, and nowadays.
  7. Since null is not an object, this crashes when trying to compare the contents of your object to the contents of null. The == operator checks for reference equality, which means that it looks whether the two objects are actually the very same object

Check if a String is Null or Empty in Java - KnpCod

Comparisons can be made: null === null to check strictly for null or null == undefined to check loosely for either null or undefined EVALUATION The spec for Comparable already states that implementations should throw a null pointer exception if the argument is null. Noting this behavior should not be expected to be replicated for every Comparable class. Closing as not a bug. ###@###.### 2005-03-24 21:17:42 GM Arunkumar Gudelli. I am One among a million Software engineers of India. I write beautiful markup.I make the Web useful comparing timestamp object to null . harpd dhillon. Greenhorn Posts: 8. posted 17 years ago . Hello, i'm developing a servlet that shows the fields of table in mysql , and if the field is null, it shows blank. I don't know how to compare timestamp object to null. For example: java.sql.Timestamp endtime = rs.getTimestamp(endtime); Now, i wanna check if the database value is null and if it is. An Optional is a container that can either be empty or contain a non-null value. Brian Goetz, Java Language Architect at Oracle, explained the reasoning behind adding its inclusion: Our intention was to provide a limited mechanism for library method return types where there needed to be a clear way to represent no result, and using null for such was overwhelmingly likely to cause.

java comparison null It depends on whether you consider a null entry to be a valid string value worth of comparison. is null < or > apple. The only thing I could say for sure is that null == null. If you can define where null fits into the ordering then you can write the code appropriately. In this case I might choose to throw a NullPointerExcpetion or IllegalArgumentException and try to. Java String compare. We can compare string in java on the basis of content and reference. It is used in authentication (by equals() method), sorting (by compareTo() method), reference matching (by == operator) etc.. There are three ways to compare string in java

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Indeed, JSHint, one of the more popular JavaScript linting tools, provides an option to allow the use of loose equality only when comparing to null. Of course, you can choose to be more explicit about the fact that you are checking for both null and undefined, but next time you run across == null, don't automatically think, Bad practice! Instead, take a look at the context and see if it is being used strategically A place where I share my thoughts about programming. Hello, Hibernate Validator. In every enterprise application there is a need for validation Now map the null values to default value with the help of map() method. Collect the modified stream into Map using collect() method. The null values has been successfully replaced with default value. Below is the implementation of the above approach: Example 1: With integers

The java.sql.ResultSet interface represents such tabular data returned by the SQL statements. i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general). The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned. Ich bekomme einen Null Pointer in der compare-Methode einer inneren Klasse als Comparator - wie geht das, denn ich kann die Methode doch nur aufrufen, wenn ich die beiden zu vergleichenden Objekte mitschicke? Beim Zugriff auf u1 oder u2 krachts - mal so mal so?! Java: // Baum der die Umkreise vorhaelt umkreisBaum = new TreeSet<Umkreis>( new Comparator<Umkreis>(){ @Override public int compare.

Returns a null-friendly comparator that considers null to be less than non-null. When both are null, they are considered equal. If both are non-null, the specified Comparator is used to determine the order. If the specified comparator is null, then the returned comparator considers all non-null values to be equal The null handling which Guava provides is very close to the one in Scala- they try to avoid the use of null altogether. Sir C. A. R. Hoare who invented the null reference calls it as a billing dollar mistake. Lets see how we can use Guava to avoid null and compare it with the support provided by Scala. Avoiding nulls in Java using Google. Java API documentation says that NullPointerException can be thrown, when there is an attempt to use null where an object is required. That is you are trying to access a reference where there is no value. Main scenarios are when, calling the instance method of a null object and accessing or modifying the field of a null object. When you pass null to a method when it expects a real value. It. Use IFNULL or COALESCE() function in order to convert MySQL NULL to 0.The syntax is as followsSELECT IFNULL(yourColumnName,0) AS anyAliasName FROM yourTableName. SQL's use of NULL values and Java's use of null are different concepts. So, to handle SQL NULL values in Java, there are three tactics you can use: Avoid using getXXX( ) methods that return primitive data types. Use wrapper classes for primitive data types, and use the ResultSet object's wasNull( ) method to test whether the wrapper class variable that received the value returned by the getXXX.

The constructor explicitly compares filespec with null, throwing NullPointerException when this parameter contains null. The point is to enforce the precondition that filespec not contain null There are still few techniques for using or accessing the nullable variable. One of them is safe call ?. and another one is null check !! but before figuring out the difference among both, let's understand what they are in detail first CompareTo (B) 0 (null) zurückgibt und B. CompareTo (c) 0 (null) zurückgibt, muss A. CompareTo (c) 0 (null) zurückgeben. If A.CompareTo(B) returns zero and B.CompareTo(C) returns zero, then A.CompareTo(C) must return zero. Wenn eine. CompareTo (B) einen anderen Wert als 0 (null) zurückgibt, muss B. CompareTo (a) einen Wert des umgekehrten Zeichens zurückgeben. If A.CompareTo(B) returns a. Java has different methods of comparing objects and primitives, each with its own semantics. Using the wrong one can lead to unexpected results and might introduce subtle, hard to catch bugs

Based on the result, Java will return Boolean True or False. == Operator compares the Object reference of one string with another and returns the result. How to Perform String Comparison in Java. In this Java program, We are going to perform Java string comparison. Here, we will compare two strings using both string.equals method and == operator Guide to Java 8 Comparator.comparing() Last modified: July 22, 2019. by baeldung. Java + Java 8; I just announced the new Learn Spring course, focused on the fundamentals of Spring 5 and Spring Boot 2: >> CHECK OUT THE COURSE. 1. Overview . Java 8 introduced several enhancements to the Comparator interface, including a handful of static functions that are of great utility when coming up with a.

Oracle IS NULL for beginners and professionals with examples on insert, select, update, delete, table, view, join, key, functions, procedures, indexes, cursor etc 【Java】nullを考慮しつつ複数キーでソートする . Java sort java8 この部分は、比較をcomparing(xxx).thenComparing(xxx).thenComparing...と繋いでいくことで実現できます。 ただし、全てのソートでnullは最後とする. 今回はnullが最後なのでnullsLast([Comparator])で囲いました。 そもそも、用意されているcomparatorは. For comparison, the alternative code for the first of these expressions without a null-conditional operator is: Another use for null-conditional member access is to invoke delegates in a thread-safe way with much less code. The following example defines two types, a NewsBroadcaster and a NewsReceiver. News items are sent to the receiver by the NewsBroadcaster.SendNews delegate. Public. Eine NullPointerException wird immer dann geworfen, wenn null anstelle einer Instanz eines Objekts verwendet wurde. Dies ist immer dann der Fall, wenn einer Variablen eines Objekts der Wert null zugewiesen wurde, und auf dieses Objekt entsprechend zugegriffen wird. Siehe Kapitel 04.02 Objekte.. In folgenden Fällen wird eine NullPointerException geworfen. . Bei I am new in Java programming. I want to know that how to check integer variable whether it is null or not. I have a situation I write a program that asks that how old are you. If a person accidentally press enter and does not put a value, I give a message that age can't be null. I hope someone will.

- if both object are null , it will return true - if one object is null, false will return - otherwise equality comparison based on equals() method. example : String s1 = null; String s2 = one; if you apply s1.equals(s2); Then in this case if s1 is null like here, it will give you nullpointer exception. So for safe comparison we can use Strings in Java represents an array of characters. They are represented by the String class. Using compareTo() method. The compareTo() method of the String class two Strings (char by char) it also accepts null values. This method returns an integer representing the result, if the value of the obtained integer is

compare - Comparing to null - !== vs != in JavaScript

Since Java 7 you can use the static method Objects.equals(Object, Object) to perform equals checks on two objects without caring about them being null.. If both objects are null it will return true, if one is null and another isn't it will return false.Otherwise it will return the result of calling equals on the first object with the second as argument I have a variable that has the result of a scriplet method which returns null. It's not a string, and it doesn't seem like an object eitherbecause I can't compare it to anything.. It is just null, plain and simple. How do I get around this problem? I need to know if it is null to be able to ignore it's value. This is what I wanted How do I compare two values? If one is null and other has values,if these are assigned at run time ; how do I compare with equalsIgnoreCase and equals() ? Apparently null is different from any other value,so I HAVE TO EXPECT null and other values in both elements. This happends for only first element. How do I write a refined code for comparing two values considering or expecting null ? if I. The java.sql.ResultSet interface represents such tabular data returned by the SQL statements. i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general). The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned.

How to compare String with null ?? (Java in General forum

  1. NULL is used in SQL to indicate that a value doesn't exist in the database. It's not to be confused with an empty string or a zero value. While NULL indicates the absence of a value, the empty.
  2. g is a String. Java program
  3. null !== undefined. As you can see so far, null and undefined are different, but share some similarities. Thus, it makes sense that null does not strictly equal undefined. null !== undefined . But, and this may surprise you, null loosely equals undefined. null == undefined. In JavaScript, a double equals tests for loose equality and preforms type coercion. This means we compare two values after converting them to a common type
  4. 9) Comparing nulls in Java You can compare null value using == (equal to ) operator and != (not equal to) operator, but cannot use it with other arithmetic or logical operator e.g. less than or greater than. Unlike in SQL, in Java null == null will return true, as shown below
  5. The Java String compareTo() method is used for comparing two strings lexicographically. Each character of both the strings is converted into a Unicode value for comparison. If both the strings are equal then this method returns 0 else it returns positive or negative value. The result is positive if the first string is lexicographically greater than the second string else the result would be negative
  6. A long is primitive A Long is a type reference to a Long object Long l=..... If(l==null).

In the last Java program line, we are comparing the null values, use this == operator. System.out.println(== Result : Null Equals to Null = + (null == null)); NOTE: If we use the equals method to compare the null values, it will throw an error Comparison Operators . Apache spark supports the standard comparison operators such as '>', '>=', '=', '<' and '<='. The result of these operators is unknown or NULL when one of the operands or both the operands are unknown or NULL.In order to compare the NULL values for equality, Spark provides a null-safe equal operator ('<=>'), which returns False when one of the. Java 8 introduced java.util.Optional<T>. It is a container that may or may not hold non-null values. Java 8 gave us a safer way to handle objects whose value may be null in some of the cases. It. I heard numerous times that when comparing Strings in Java, to avoid null pointer exception, we should use abc.equals(myString) instead of myString.equals(abc), but my question is, is this idea already problematic in terms of business logic? Suppose myString should not be empty in normal conditions, if we just use abc.equals(myString) to avoid null pointer exception, we may miss some.

Primitives vs. Objects. The Java type system is two-fold, consisting of eight primitive data types (boolean, byte, char, short, int, long, float, double), and object reference types.. Primitives. Primitives in Java can't be uninitialized or null, they always have a default value.It represents 0, suitable for the specific data type What is null? In SQL databases, null means that some value is unknown, missing, or irrelevant.The SQL concept of null is different than null in programming languages like JavaScript or Scala. Spark DataFrame best practices are aligned with SQL best practices, so DataFrames should use null for values that are unknown, missing or irrelevant Checks if all values in the array are not nulls.. If any value is null or the array is null then false is returned. If all elements in array are not null or the array is empty (contains no elements) true is returned. ObjectUtils.allNotNull(*) = true ObjectUtils.allNotNull(*, *) = true ObjectUtils.allNotNull(null) = false ObjectUtils.allNotNull(null, null) = false ObjectUtils.allNotNull(null. Writing code with input parameters that are not null is not ''safer;'' it's exactly the opposite — it makes Java code less readable and less safe If 26 is something and NULL is nothing and nothing is not something then NULL is not 26. Seems logical to me. Does anyone know how I can, in a cleaner way, include nulls in my results when using comparisons without having to include an explicit check each and every time. Also turning off nulls on my tables is definitely not an option. Edit

Objekte vergleichen mit Comparable und Comparator

Disallow Null Comparisons (no-eq-null) Comparing to null without a type-checking operator ( == or != ), can have unintended results as the comparison will evaluate to true when comparing to not just a null , but also an undefined value When comparing two non-null objects, the specified Comparator is used. Parameters: This argument cannot be null Throws: java.lang.NullPointerException - if nonNullComparator is null; NullComparator public NullComparator(boolean nullsAreHigh) Construct an instance that sorts null higher or lower than any non-null object it is compared with. When comparing two non-null objects, the. It's definitely a bug linked to the upgrade of Groovy. I can switch the report language from Groovy to Java and I get the expected behavior. Thanks, Matt. mdahlman. 14038 . Joined: Mar 13 2007 - 2:43am . Last seen: 6 years 2 months ago . 0. Posted on May 20, 2011 at 1:50am Hi, Sorry for my late intervention on this thread, but we were actually aware of this problem and worked to solve in the. In an expression transformation, I'm comparing the current fields of a table with potentially newer updates to those fields. I have to keep history, so I only want to update if there is a real change to a column. I was doing a field by field comparion and it partially works -- for non-null fields only. Flawed Logic I have The NULL literal. The NULL literal represents a null value, similarly to null in Java and SQL. Since JPQL is case insensitive, NULL, null and Null are equivalent. Notice that comparison with NULL in JPQL follows the SQL rules for NULL comparison rather than the Java rules, as explained in the Comparison Operators page.. Boolean Literals. Similarly to Java and SQL, JPQL supports two boolean.

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Dort muss man den Sonderfall der null-Referenz als Argument von equals() explizit abfangen, weil der equals()-Contract verlangt, dass der Vergleich mit null immer false liefern muss. equals() ist deshalb in der Behandlung von null-Referenzen nicht symmetrisch: o.equals(null) muss false liefern, wohingegen null.equals(o) eine NullPointerException auslöst. compareTo() hingegen ist auch für. null Handling. There's nothing more frustrating that having to look at 1000s of lines of Java code, to find the cause of a Null Pointer Exception (NullPointerException).. If you know what you're doing, it's usually not too much of a problem; A little understanding of Java Classes and Exceptions goes a long way to helping. This is as much a Java lesson than it is Talend at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028) //and then about 30 more at lines Why am I getting these exceptions and how do I fix it? View Replies View Related Points To Ponder For Java Null Pointer Exceptions Dec 12, 2014. This is what I wrote and I get this eror : Points to Ponder for Java Null Pointer Exception The below code ran perfectly when the Me.Shorten_Date was coded as required entry. Then the business process changed and now they want Me.Shorten_Date to be optional. And now there is a problem I can't figure out. Me.Shorten is tied to a checkbox. When the box is checked, a sub is called. When creating a new record with no Me.date entry, code runs.. Null functions. Oracle Database includes many functions to help you handle nulls. NVL and coalesce are two that map nulls to non-null values. NVL. This takes two arguments. If the first is null, it returns the second: select toy_name, volume_of_wood, nvl ( volume_of_wood , 0 ) mapped_volume_of_wood from toys; Coalesce. This is like NVL. But it. 20. null or an empty String for optional data members coderanch.com. I have a Java class that models a business domain object. This business domain object has a number of fields that are represented as String-valued data members in the corresponding class

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