Java - Double equals() method

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Description

The Java Double equals() method compares this object against the specified object. The result is true if and only if the argument is not null and is a Double object that represents a double that has the same value as the double represented by this object.

Declaration

Following is the declaration for java.lang.Double.equals() method

public boolean equals(Object obj)

Parameters

obj − This is the object to compare with.

Return Value

This method returns true if the objects are the same, else false.

Exception

NA

Example 1

The following example shows the usage of Double equals() method to check equality of two double objects. We've initialized two Double objects with same underlying value. Then using equals() method, we're checking the equality.

package com.tutorialspoint;
public class DoubleDemo {
   public static void main(String[] args) {

      // compares this object against the specified object
      Double obj1 = new Double("2");
      Double obj2 = new Double("2.0");
      System.out.print(obj1 + " = " + obj2);
      System.out.println(" ?  " + obj1.equals(obj2)); 
   }
} 

Output

Let us compile and run the above program, this will produce the following result −

2.0 = 2.0 ?  true

Example 2

The following example shows the usage of Double equals() method to check equality of two double objects. We've initialized two Double objects with different underlying values. Then using equals() method, we're checking the equality.

package com.tutorialspoint;
public class DoubleDemo {
   public static void main(String[] args) {

      // compares this object against the specified object
      Double obj1 = new Double("3.0");
      Double obj2 = new Double("5.0");
      System.out.print(obj1 + " = " + obj2);
      System.out.println(" ?  " + obj1.equals(obj2)); 
   }
} 

Output

Let us compile and run the above program, this will produce the following result −

3.0 = 5.0 ?  false

Example 3

The following example shows the usage of Double equals() method to check equality of two double objects. We've initialized one Double object with a value and keeping other Double object as null. Then using equals() method, we're checking the equality.

package com.tutorialspoint;
public class DoubleDemo {
   public static void main(String[] args) {

      // compares this object against the specified object
      Double obj1 = new Double("3.0");
      Double obj2 = null;
      System.out.print(obj1 + " = " + obj2);
      System.out.println(" ?  " + obj1.equals(obj2)); 
   }
} 

Output

Let us compile and run the above program, this will produce the following result −

3.0 = null ?  false