🐴 How To Use Equals Method In Java

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. 3) String compare by compareTo() method. The above code, demonstrates the use of == operator used for comparing two String objects.. 3) By Using compareTo() method. The String class compareTo() method compares values lexicographically and returns an integer value that describes if first string is less than, equal to or greater than second string. Parameters: Obj - The object to compare with. Return Value: This method returns a Boolean value, It returns true, if the Boolean objects represent the same value. It returns false, if the Boolean objects represent different value. If you need to write your own equals methods, you should always override canEqual if you change equals and hashCode. NEW in Lombok 1.14.0: To put annotations on the other parameter of the equals (and, if relevant, canEqual) method, you can use onParam=@__({@AnnotationsHere}). Be careful though! This is an experimental feature. Use Objects.equals() to compare strings, or any other objects if you're using JDK 7 or later. It will handle nulls without throwing exceptions. See more here: how-do-i-compare-strings-in-java. And if you're not running JDK 7 or later you can copy the equals method from Objects like this: This works for Java because classes are singletons and the VM guarantees this. If you're paranoid, you can use this.getClass().equals(obj.getClass()) but the two are really equivalent. This works most of the time. But sometimes, Java frameworks need to do "clever" things with the byte code. This usually means they create a subtype automatically. 3. One thing to consider is that you are not overriding the equals method from Object, as you are changing the param type. You might find this method will not be used in all cases as you might expect. Instead of: public boolean equals (Ghost other) {. you should have: public boolean equals (Object other) {. For primitive types, when calling a method, the type is previously converted (boxed) to a reference type and then the method is called. This means that for primitive types a == b will yield the same value as a.equals(b), but in the latter case two temporary boxed objects are created prior to calling the equals() method. This will make the The Object class equals method compares the object using reference. i.e. a.equals(a); always returns true. If we are going to provide our own implementation then we will use certain steps for object equality. Reflexive: a.equals(a) always returns true; Symmetric: if a.equals(b) is true then b.equals(a) should also be true. 1. If you're using eclipse (netbeans has similar features, as do most java IDEs), you can simply got to the "Source" menu, and choose "Generate hashcode () and equals ()". Then you select the fields you want to be considered (in your case the list of enum values. That being said, assuming you already have the enum, here's the code that eclipse 1. First difference between them is, equals () is a method defined inside the java.lang.Object class, and == is one type of operator and you can compare both primitive and objects using equality operator in Java. 2. Second difference between equals and == operator is that == is used to check a reference or memory address of the objects whether Is it possible to do something like this in Java for Android (this is a pseudo code) IF (some_string.equals("john" OR "mary" OR "peter" OR "etc."){ THEN do something } ? At the moment this is done via multiple String.equals() condition with || among them. xBFFstW.

how to use equals method in java