Java Boolean equals(Object obj) method example

Important Notes:

• overrides equals in class Object

public boolean equals(Object obj)

The equals(Object obj) method of Boolean class returns true if and only if the argument is not null and is a Boolean object that represents the same boolean value as this object.

		Boolean f1 = true;
		Boolean f2 = true;
		System.out.println(f1==f2);

Normally if the above code declaration uses float primitive type, the result would be true however since the boolean value true  is assigned to wrapper class Boolean, it would print out false. If we wanted to use the == operator instead of equals, then we need to convert the Boolean values using the booleanValue() method of Boolean class.

		f1.booleanValue() == f2.booleanValue()

The above code snippet would result to true.

Below is a simple java example on the usage of equals(Object obj) method of Boolean class.

package com.javatutorialhq.java.examples;

/*
 * This example source code demonstrates the use of 
 * equals(Object obj) method of Boolean class.
 */

public class BooleanEqualsExample {

	public static void main(String[] args) {	
		
		// instantiate a Boolean
		Boolean bool = new Boolean(true);
		
		// instantiate an Object
		Object obj = new Boolean(true);
		
		// test equality of the two value
		if(bool.equals(obj)){
			System.out.println("they are equal using equals test");
		}
		else{
			System.out.println("they are not equal using equals test");
		}
		

		// test equality of the two value using ==
		if(bool==obj){
			System.out.println("they are equal using == test");
		}
		else{
			System.out.println("they are not equal using == test");
		}
		
		
	}

}

Basically on the above example, we have declared three boolean values. We then compared all three values with each other and printed the result on the console.

Below is the sample output when you run the above example.

• Java Boolean Class Tutorial
• Java Tutorial

• Oracle Java Documentation