Java Double equals() method

The equals() method of Java Double class compares this Double object against the specified Double object.

The method returns true, if the argument is not null.

Assuming d1 and d2 are the two instances of class Double, the value of d1.equals(d2) will be true if

Also returns the value true.

Overrides:

The equals() method of class Double overrides the equals() method in class Object.

Syntax

Parameters

obj - this is the object to compare with.

Return value

The equals() method will return true if objects are same, otherwise returns false.

Example 1

import java.util.Scanner;

public class Double_equalsMethodExample1 {
    public static void main(String[] args) {

        Double d1 = new Double(12345.89);

        Scanner scanner= new Scanner(System.in);
        System.out.println("Enter your bank accountNo.");
        Double d2= scanner.nextDouble();

        if(d2.equals(d1)){

            System.out.println("Your accountNo has matched.Now you can proceed with your transaction");
        }
        else
        {
            System.err.println("Incorrect bank accountNo");
        }
    }
}

Output:

Enter your bank accountNo.
12345.89
Your accountNo has matched.Now you can proceed with your transaction

Example 2

import java.util.Scanner;
public class Double_equalsMethodExample2 {
    public static void main(String[] args) {
        Double d1 = new Double(2);
        System.err.println("Q. If an ant has 4 legs.How many legs do 8 ants will have ?\n1.8 Legs \b  2.32 legs \b  3.65legs");

        Scanner scanner= new Scanner(System.in);

        System.out.println("Enter your option ");
		        Double d2 = scanner.nextDouble();

        if(d2.equals(d1)){

            System.out.println("Your answer is correct!");
        }
        else{
            System.out.println("opps! Wrong answer. Try again");
        }
    }
}

Output:

Q. If an ant has 4 legs.How many legs do 8 ants will have ?
1.8 Legs 	  2.32 legs 	  3.65legs
Enter your option 
2
Your answer is correct!

Example 3

import java.util.Scanner;
public class Double_equalsMethodExample3 {

    public static void main(String[] args) {

        Double d1 = new Double(768.90);

        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter your name.");

        String str = scanner.next();

        System.out.println("Enter your old password.");

        Double d2 = scanner.nextDouble();

        if (d1.equals(d2)) {

            System.out.println("Enter your new password");

            String str2 = scanner.next();

            System.out.println(str+" your password has successfully changed to " + str2);

        } else {

            System.out.println("Oops! wrong password. Re-enter the correct password");

        }

    }

}

Output:

Enter your name.
Himanshu
Enter your old password.
768.90
Enter your new password
panda@123
Himanshu your password has successfully changed to panda@123

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