How to convert a string to boolean in Java

Given a string str, the task is to convert the given string to its boolean value.

Boolean datatype consists of only two values: true and false. If the string is true (ignoring case), the Boolean equivalent will be true, else false.

Examples: 

Input: str = “true”

Output: true



Explanation: The boolean equivalent of true is true itself.

Input: str = “false” 

Output: false 

Explanation: The boolean equivalent of false is false itself.

Input: str = “yes” 

Output: false

Explanation: The boolean equivalent of yes is false since the given value is not equal to true.

 

The methods to convert the string to its boolean value are as follows:



Method 1: 

  • Using Boolean.parseBoolean() method. This is the most common method to convert String to boolean.
  • This method is used to convert a given string to its primitive boolean value.
  • If the given string contains the value true ( ignoring cases) then this method returns true, if the string contains any other value other than true then the method returns false.

Syntax:

boolean boolValue = Boolean.parseBoolean(String str)

Below is the implementation of the above approach:

Java

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class GFG {
  
    // Function to convert a string
    // to its boolean value
    public static boolean
    stringToBoolean(String str)
    {
        // convert a given string to
        // its primitive boolean value
        // using parseBoolean() method
        boolean b1
            = Boolean.parseBoolean(str);
  
        // returns primitive boolean value
        return b1;
    }
  
    // Driver code
    public static void main(String args[])
    {
        // Given String str
        String str = "yes";
  
        // print the result
        System.out.println(
            stringToBoolean(str));
  
        // Given String str
        str = "true";
  
        // print the result
        System.out.println(
            stringToBoolean(str));
  
        // Given String str
        str = "false";
  
        // print the result
        System.out.println(
            stringToBoolean(str));
    }
}

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Output


false
true
false





Method 2:  


    

  • Using Boolean.valueOf() method.
    • 

  • It is similar to Boolean.parseBoolean() method, but it returns a boolean object instead of a primitive boolean value.
    • 



Syntax:




boolean boolValue = Boolean.valueOf(String str)





Below is the implementation of the above approach:




Java














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class GFG { 


  


    // Function to convert a string 


    // to its boolean object 


    public static boolean


    stringToBoolean(String str) 


    { 


        // convert a given string to 


        // its boolean object using 


        // valueOf() method 


        boolean b1 = Boolean.valueOf(str); 


  


        // returns boolean object 


        return b1; 


    } 


  


    // Driver code 


    public static void main(String args[]) 


    { 


        // Given String str 


        String str = "yes"; 


  


        // print the result 


        System.out.println( 


            stringToBoolean(str)); 


  


        // Given String str 


        str = "true"; 


  


        // print the result 


        System.out.println( 


            stringToBoolean(str)); 


  


        // Given String str 


        str = "false"; 


  


        // print the result 


        System.out.println( 


            stringToBoolean(str)); 


    } 


}



















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Output


false
true
false







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