To use removeAll (), you'll have to copy the set then use it. Set one = new HashSet (firstSet); Set two = new HashSet (secondSet); one.removeAll (secondSet); two.removeAll (firstSet); If the contents of one and two are both empty, then you know that the two sets were equal. If not, then you've got the elements that made the sets unequal.
somewhat late to the party, but for the null check, you should do "Peter".equals(name). That way you don't have a possible null object to invoke an operation on
1. The equals () of arrays is inherited from Object, so it does not look at the contents of the arrrays, it only considers each array equal to itself. The Arrays.equals () methods do compare the arrays' contents. There's overloads for all primitive types, and the one for objects uses the objects' own equals () methods.
new String("a").equals(new String("a")) => true - addresses differ, but Java will took one object state ('a') and compared with other object state ('a') will found them equal and will report true. Using the equals() method you can code the comparison any way is proper for your program. intern() is a bit different story. It is intended to return
The following are the methods of the base Java Object which are present in all Java objects due to the implicit inheritance of Object. The focus of this article is the equals (Object) method which is used to test for equality among objects and gives the developer the ability to define a meaningful test of logical equivalence.
3 Answers. Sorted by: 2. Simply negate the result of equals: !string.equals ("ABC") String.equals returns a boolean value, to get the inverse of any boolean value, use the ! operator: boolean t = true; // t will be true boolean f = !t; // f will be false. Share.
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Java - abstract class, equals (), and two subclasses. I have an abstract class named Xpto and two subclasses that extend it named Person and Car. I have also a class named Test with main () and a method foo () that verifies if two persons or cars (or any object of a class that extends Xpto) are equals. Thus, I redefined equals () in both Person
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how to test equals method in java
