Java Boolean compareTo() Method with Examples

by Online Tutorials Library July 22, 2022

Java Boolean compareTo() method

The compareTo() method of Java Boolean class compares the Boolean instance with the Boolean argument and returns an integer value based on the result of this method.

Syntax:

Parameters:

Here, b is the Boolean instance passed (which is compared).

Return Value:

This method returns an integer value.

It returns zero, if the object b represents the same Boolean value as the argument.
It returns positive value, if object b represents true and the argument represents false.
It returns a negative value, if object b represents false and the argument represents true.

Example 1

  public class BooleanCompareToExample1 {      public static void main(String[] args) {          Boolean b1 = new Boolean(false);          Boolean b2 = new Boolean(false);          //compare b1 with b2          int b3 = b1.compareTo(b2);          if(b3==0){              System.out.println(“Both values are equal”);          }          else if(b3>0){              System.out.println(“b1 value is true”);          }          else{              System.out.println(“b2 value is true”);          }      }  }  

Test it Now

Output:

Both values are equal

Example 2

  import java.util.Scanner;    public class BooleanCompareToExample2 {      public static void main(String[] args) {          Scanner scanner = new Scanner(System.in);          int a,b;          Boolean b1=true;          Boolean b2=true;          System.out.println(“Enter two no.s”);          System.out.print(“I no : “);a = scanner.nextInt();          if(a>0){              b2 =false;          }          System.out.print(“II no : “);b = scanner.nextInt();          if(b>a){              b1 = false;              b2=true;          }          else if(a==b){              b1=true;              b2=true;          }          int val =b1.compareTo(b2);          if(val>0){              System.out.println(a+” is greater”);          }          else if(val==0){             System.out.println(a+” and “+b+” are equal.”);         }          else if(val<0){              System.out.println(b+” is greater”);          }      }  }  

Output:

Enter two no.s  I no : 89  II no : 90  90 is greater

Example 3

  import java.util.Scanner;    public class BooleanCompareToExample3 {      public static void main(String[] args) {          Scanner scanner=new Scanner(System.in);          System.out.print(“Enter your age : “);          Double a = scanner.nextDouble();          Boolean b1= true;          Boolean b2= true;          if(a<18){              b2=false;          }          int b3 = b1.compareTo(b2);          if(b3==0){              System.out.println(“Congratulations! you can vote.”);          }          else{              Double b = 18-a;              System.out.println(“Sorry! you can vote after “+b+” years. “);          }      }  }  

Output:

Enter your age : 16  Sorry! you can vote after 2.0 years.

Example 4

  public class BooleanCompareToExample4 {      public static void main(String[] args) {          boolean b1 =true;          boolean b2 =false;          for(int i=0;i<10 ;i++){              if(i==5){                  b2=false;                  break;              }          }          int val=b1.compareTo(b2);      }  }  

Test it Now

Output:

Error:(13, 19) java: boolean cannot be dereferenced

The Boolean is a primitive data type. Its object can’t be used to call the Boolean class methods. If done, so it will give the above error.

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Java Boolean compareTo() method

Syntax:

Parameters:

Return Value:

Example 1

Example 2

Example 3

Example 4

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