Yes, StringBuilder does not override Object 's .equals () function, which means the two object references are not the same and the result is false. For StringBuilder, you could use s1.toString ().equals (s2.toString ()) For your edit, you're calling the == operator on two different String objects. Since java.lang.String class override equals method, It return true if two String object contains same content but == will only return true if two references are pointing to same object. Here is an example of comparing two Strings in Java for equality using == and equals() method which will clear some doubts: Regardless of what you use, you can basically guarantee that new Employee().equals(new Person()) is going to be false (Person is not an instance of Employee). The result must be the same if you invert the arguments, so a Person cannot be equal to a subclass of itself (unless you do something very funky in the subclass' equals() method). – 99 4. A code-only answer is not high quality. While this code may be useful, you can improve it by saying why it works, how it works, when it should be used, and what its limitations are. Please edit your answer to include explanation and link to relevant documentation. – Stephen Ostermiller. 12 Answers. The best way is to use str.equalsIgnoreCase ("foo"). It's optimized specifically for this purpose. You can also convert both strings to upper- or lowercase before comparing them with equals. This is a trick that's useful to remember for other languages which might not have an equivalent of equalsIgnoreCase. Using the Not Equals Operator With equals () We can use the ! operator with the equals () method to check if the contents of the variables match or not. In the example, we take two String variables. In the if condition, we check the str1.equals (str2) with a ! operator at the beginning. The ! operator makes the result opposite, which means if dYfL9n. Write a Java method that will remove duplicates from a given list. Assuming: Method accepts type List. Return type is void. Duplicates are determined using equals () Main: Creates an instant of List and loads it with duplicate String values. Invoke removeDuplicates (), pass in this list. Outputs modified list to the console. That’s not quite true, actually. In Java, every class has the Object class as a parent. And Object’s implementation of equals() defaults to ==. In other words: if neither your class nor its ancestors provide a custom implementation of the equals() method, you’ll end-up performing a reference comparison, perhaps inadvertently. The isEqual () method of LocalDate class in Java checks if this date is equal to the specified date or not. Syntax: public boolean isEqual (ChronoLocalDate date2) Parameter: This method accept a single mandatory parameter date2 the other date to compare to and not null. Return Value: The function returns true if this date is equal to the You'll need to cast other to a Pokemon object (and use instanceof) if you want to use methods and member variables specific to the Pokemon class. You need this override if you want other JDK (or even your own) code that uses .equals() to call your custom .equals() method, instead of the base Object.equals() one. Object defines hashCode, equals, and toString and has default implementations of all three. What you are trying to achieve is good, but not practicable. If you want to force overriding of equals () and hashCode (), extend from an abstract superclass, which defines these methods as abstract. Assert.assertEquals () Method Example. Let's create a trimWhitespace () method to trim leading and trailing whitespace from the given String. We will create a JUnit test for the trimWhitespace () method to do unit testing. import static org.junit.Assert.assertEquals ; import org.junit.Test ; public class AssertEqualsExamples { /** * Trim

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