Java Integer hashCode() method

The hashCode()  method of Java Integer class returns a hash code for this Integer.  Syntax

1. public int hashCode()
2. public static int hashCode(int value) 

Parameters The parameter ‘value’ represents a value whose hash code is to be determined. Overrides The hashCode() method overrides hashCode in class Object. Return Value This method returns a hash Code value for this Integer. Example 1

public class JavaIntegerHashCodeExample1 {
    public static void main(String[] args) {
        Integer val=45;
        //returns a hash code for this Integer
        int hash=val.hashCode();
        System.out.println("Hash code for "+val+" is "+hash);
        Integer va11=78;
        System.out.println("Hash code for "+va11+" is "+va11.hashCode());
    }
}

Output

Hash code for 45 is 45
Hash code for 78 is 78

Example 2

public class JavaIntegerHashCodeExample2 {
    public static void main(String[] args) {
        Integer val=45;
        //calling a static hash code method
        int hash=Integer.hashCode(val);
        System.out.println("Hash code for "+val+" is "+hash);
        Integer va11=78;
        System.out.println("Hash code for "+va11+" is "+Integer.hashCode(va11));
    }
}

Output

Hash code for 45 is 45
Hash code for 78 is 78