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equals method in java


The equals() method in java is an Object class method. It return true for two non-null reference values x and y if and only if x and y refer to the same object. That means, basic implementation of equals method compares the memory location and not compare the object values.

Syntax

public boolean equals(Object obj)

Java equals method example

package com.codesjava;
 
public class Test {
	public static void main(String args[]){
		String str1 = "codesjava";
		String str2 = "codesjava";
		//Return true, compare reference
		System.out.println(str1.equals(str2));
 
		String str3 = new String("codesjava");
		String str4 = new String("codesjava");
		//Return true, compare reference
		System.out.println(str3.equals(str4));
 
		Site site1 = new Site("codesjava", 1);
		Site site2 = new Site("codesjava", 1);
		//Return false, compare reference
		System.out.println(site1.equals(site2));		
	}
}
 
class Site{
	private String name;
	private int id;
 
	public Site(String name, int id) {
		super();
		this.name = name;
		this.id = id;
	}
 
	public String getName() {
		return name;
	}
 
	public void setName(String name) {
		this.name = name;
	}
 
	public int getId() {
		return id;
	}
 
	public void setId(int id) {
		this.id = id;
	}
}

Output

true
true
false

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