Java array hashcode

In Java, the hashCode() method is a method of the Object class that is used to calculate a hash code value for an object. A hash code is a numerical value that is used to identify an object in a hash-based data structure, such as a hash table or a hash map.

By default, the hashCode() method returns a different value for each object, based on the object's memory address. However, you can override the hashCode() method in your own classes to provide a more meaningful hash code value based on the object's state.

Here is an example of how to override the hashCode() method in a class:

public class MyClass {
    private int x;
    private int y;

    public MyClass(int x, int y) {
        this.x = x;
        this.y = y;
    }

    @Override
    public int hashCode() {
        int result = 17;
        result = 31 * result + x;
        result = 31 * result + y;
        return result;
    }
}

In this example, the hashCode() method calculates a hash code value based on the values of the x and y fields of the MyClass object.