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Category: Lang Package

What is the importance of SCP(String constant pool)?

What is the importance of SCP(String constant pool)?What is the importance of SCP(String constant pool)? There are two ways to create a String object in Java: Using the new operator. For example, String str = new String("Java4us");. Using a string literal or constant expression). For example, String str="Java4us"; (string literal) or String str="Java" + "4us"; (string constant expression). In our program, if a String . . . Read more

What is the Contract between equals and hashCode method?

What is the Contract between equals and hashCode method

What is the Contract between equals and hashCode method If two objects are equals by .equals() then their hashCode must be equals. That is two equivalent object should have the same hashCode that is if r1.equals(r2) is true then r1.hashcode==r2.hashcode is always true. Object class .equals() method and hashCode() method . . . Read more

What is the Relation between equals() and (==) Operator?

What is the Relation between equals() and (==) Operator?

What is the Relation between equals() and (==) Operator? (==) operator is a binary operator in java which compares the two objects based on their location in the memory. That means if two reference variables are pointing to the same object in the memory then applying (==) operator on those reference variables will return . . . Read more

Why do we have to override the equals() method in Java?

Why do we have to override the equals() method in Java?

Why do we have to override the equals() method in Java? We can use the equals method to check equality of two objects. The equals() method of java.lang.Object class acts the same as the == operator; that is, it tests for object identity rather than object equality. The implicit contract of the equals() method, however, is . . . Read more

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