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.

# `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);
  }
}

What is a boolean variable in Java?

Boolean variables in Java use the boolean keyword; values are true or false, not numerical.