Difference between Equals() and ==:

Equals():
It compares the content of the object.

Example program:

package com.ngdeveloper.com;

public class Equals {

	public static void main(String[] args) {
		String s1 = "hello";
		String s2 = new String("hello");
		String s3 = s1;
		String s4 = "Hello";

		System.out.println(s1.hashCode());
		System.out.println(s2.hashCode());
		System.out.println(s3.hashCode());
		System.out.println(s4.hashCode());

		System.out.println(s1.equals(s2));
		System.out.println(s2.equals(s3));
		System.out.println(s3.equals(s1));
		System.out.println(s4.equals(s2));

	}

}

Output:

99162322
99162322
99162322
69609650
true
true
true
false

==:

It compares the object location in memory.

Example Program:

package com.ngdeveloper.com;

public class Equals {

	public static void main(String[] args) {
		String s1 = "hello";
		String s2 = new String("hello");
		String s3 = s1;
		String s4 = "hello";

		System.out.println((s1==s2));
		System.out.println((s2==s3));
		System.out.println((s3==s4));
		System.out.println((s4==s1));

	}

}

Output:

false
false
true
true

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