Java Boolean toValue() Method

The valueOf() method of Java Boolean class returns a Boolean object representing the given Boolean or String value. It returns true, if the specified Boolean or string object is true else it returns false.

Syntax

1. public static Boolean valueOf(String s)
2. public static Boolean valueOf(boolean b)

Parameters

The parameters ‘b’ and‘s’ represents a Boolean and a String value.

Return Value

The valueOf() method returns a Boolean instance representing b or s.

Example 1

public class JavaBooleanValueOfMethodExample1 {
    public static void main(String[] args) {
        Boolean b1 = true;
        // will return a boolean instance corresponding to Boolean b1
        Boolean b2 = Boolean.valueOf(b1);
        System.out.println("value returned = "+b2);
        Boolean b3 = Boolean.valueOf(false);
        System.out.println("value returned = "+b3);
    }
}

Output

value returned = true
value returned = false

Example 2

import java.util.Scanner;
public class JavaBooleanValueOfMethodExample2 {
    public static void main(String[] args) {
        Boolean b1 = true;
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter two numbers: ");
        System.out.print("a = ");int a=scanner.nextInt();
        System.out.print("b = ");int b=scanner.nextInt();
        if(a<=0 || b<=0 || a==b){
            b1=false;
        }
        Boolean b2=Boolean.valueOf(b1);
        if(b2){
            a=b-a;
            b=b-a;
            a=a+b;
            System.out.println(" After swapping value : ");
            System.out.println("a : "+a);
            System.out.println("b : "+b);
        }
        else{
            System.out.println("Number not in the range. Please try with different numbers.");
        }
    }
}

Output

Enter two numbers:
a = 0
b = -19
Number not in the range. Please try with different numbers.

Example 3

public class JavaBooleanValueOfMethodExample3{
    public static void main(String[] args) {
    //return a boolean value representing the string
    String str1="true";
    Boolean b1 =Boolean.valueOf(str1);
    System.out.println("Boolean value: "+b1);
   // for any value of str other than true it will return false
    String str2="abc";
    Boolean b2 =Boolean.valueOf(str2);
    System.out.println("Boolean value: "+b2);
    }
}

Output

Boolean value: true
Boolean value: false

Example 4

public class JavaBooleanValueOfMethodExample4{
    public static void main(String[] args) {
        //for null value it will return an exception
       Boolean b1=null;
       Boolean b2= Boolean.valueOf(b1);
        System.out.println(b2);
    }
}

Output

Exception in thread "main" java.lang.NullPointerException
            at com.interf.JavaBooleanValueOfMethodExample4.main(JavaBooleanValueOfMethod
Example4.java:8)