Java Boolean valueOf() Method

The valueof() method of Java Boolean class returns a Boolean instance corresponding to the defined Boolean or to the defined String.

This method returns Boolean ‘true’ if the defined Boolean value or String value is true, and returns the Boolean ‘false’ if the defined Boolean or String value is false.

Syntax:

  public static Boolean valueOf(Boolean b)  public static Boolean valueOf(String s)   

Parameters:

b – This is a Boolean argument to be passed

s – This is the string argument to be passed.

Return Value:

The valueOf() method returns a Boolean instance corresponding to ‘b’ or to String ‘s’.

It returns true, if the defined Boolean value (b) or String value(s) is true.
It returns false, if the Boolean value b is false
It returns false, if the String contains any value other than true.

Example 1

  public class BooleanValueOfExample1 {      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(“valueOf() method will return = “+b2);          Boolean b3 = Boolean.valueOf(false);          System.out.println(“valueOf() method will return = “+b3);         }  }  

Test it Now

Output:

valueOf() method will return = true  valueOf() method will return = false

Example 2

  import java.util.Scanner;    public class BooleanValueOfExample2 {      public static void main(String[] args) {          Boolean b1 = true;          Scanner scanner = new Scanner(System.in);          System.out.print(“Enter the number whose table you want to print : “);          int n =scanner.nextInt();          if(n<0||n>20){              b1 = false;              System.out.println(“Please enter a valid number between 0-20.”);          }        // will return the boolean value of b1          if(Boolean.valueOf(b1)==true) {              System.out.println(“Table of “+n+” :”);              for (int i = 1; i < 11; i++) {                  System.out.println(n +” * “+  i + ” = ” + n * i);              }          }        }  }  

Output:

Enter the number whose table you want to print : 19  Table of 19 :  19 * 1 = 19  19 * 2 = 38  19 * 3 = 57  19 * 4 = 76  19 * 5 = 95  19 * 6 = 114  19 * 7 = 133  19 * 8 = 152  19 * 9 = 171  19 * 10 = 190

Example 3

  import java.util.Scanner;    public class BooleanValueOfExample3 {      public static void main(String[] args) {          Scanner scanner = new Scanner(System.in);          System.out.println(“Enter you age”);          int a = scanner.nextInt();          if(a>17) {              System.setProperty(“flag1”, “true”);          }          boolean b2 = Boolean.getBoolean(“flag1”);          if (Boolean.valueOf(b2) == true) {              System.out.println(“You are an adult.nYou are eligible to vote.”);          }          else{              int val2 =18-a;              System.out.println(“You are not an adult.nYou will be eligible to vote after “+val2+” years.”);          }      }  }  

Output:

Enter you age  78  You are an adult.  You are eligible to vote.

Example 4

  import java.util.Scanner;    public class BooleanValueOfExample4 {      public static void main(String[] args) {          Scanner scanner = new Scanner(System.in);          System.out.println(“True/False:”);          System.out.println(“Q. TalMahal is located in Delhi.”);          System.out.print(“Ans “); String str1 = scanner.next();         // will return boolean value corresponding to the String str          Boolean b1 = Boolean.valueOf(str1);            if (b1 ==true) {              System.out.println(“Correct answer.nAs TajMahal is located in Agra nor in Delhi.”);          } else  {              System.out.println(“Incorrect. Because TajMahal is located in Agra.”);          }      }  }  

Output:

True/False:  Q. TalMahal is located in Delhi.  Ans false  Incorrect. Because TajMahal is located in Agra.

Example 5

  public class BooleanValueOfExample5 {      public static void main(String[] args) {       //for “true” (ignoring the case) string value this method will return true.          String str = “True”;          Boolean b1 = Boolean.valueOf(str);          System.out.println(“1. Boolean value for “+str+” is “+b1);       //for “false” String value this method will return false          String str1= “false”;          Boolean b2 = Boolean.valueOf(str1);          System.out.println(“2. Boolean value for “+str1+” is “+b2);      //for any String value other than “true” this method will return false.          String str2 = “hwhfjh”;          Boolean b3 = Boolean.valueOf(str2);          System.out.println(“3. Boolean value for “+str2+” is “+b3);        }  }  

Test it Now

Output:

1. Boolean value for True is true  2. Boolean value for false is false  3. Boolean value for hwhfjh is false

Next TopicJava Boolean

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Java Boolean valueOf() Method with Examples

Java Boolean valueOf() Method

Syntax:

Parameters:

Return Value:

Example 1

Example 2

Example 3

Example 4

Example 5

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