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What is a boolean variable in Java?

A boolean variable in Java can be created using the boolean keyword. Unlike C++, a numerical value cannot be assigned to a boolean variable in Java – only true or false can be used. The strings “true” or “false” are​ displayed on the console when a boolean variable is printed.

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Using the boolean keyword

java.lang.Boolean

The wrapper class java.lang.Boolean can be used to create a boolean variable as well. However, instead of creating an object using the keyword new, a value of true or false is directly assigned to Boolean (with an uppercase B). If a comparison with another string is required, or if the methods of the String class need to be used, the toString() method returns the boolean value as a string.

public class bool{
  public static void main(String[] args){
    // Using primitive boolean variable:
    boolean x = true;
    if(x)
      System.out.println("x = " + x);
    
    // Using java.lang.Boolean:
    Boolean y = false;
    if(y.toString().equals("false"))
      System.out.println("y = " + y);
  }
}

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