How to use true and false in Java?

In Java, true and false are the literal values of the boolean type. The boolean type has only two literal values, true and false, used to represent true and false.

You can directly assign a boolean value to a boolean type variable, for example:

boolean isTrue = true;
boolean isFalse = false;

You can also use boolean values in logical expressions and conditional statements, for example:

boolean isTrue = true;
boolean isFalse = false;

if (isTrue) {
   System.out.println("It is true");
} else {
   System.out.println("It is false");
}

In the example above, the program will only output “It is true” when isTrue is true, otherwise it will output “It is false”.

Boolean types can also be used in logical operations with other boolean types, such as the AND (&&), OR (||), and NOT (!) operators. For example:

boolean isTrue = true;
boolean isFalse = false;

boolean result = isTrue && isFalse; // 逻辑与运算
boolean result2 = isTrue || isFalse; // 逻辑或运算
boolean result3 = !isTrue; // 逻辑非运算

In the example above, the value of “result” is false, the value of “result2” is true, and the value of “result3” is false.

In Java, true and false are the literal values used for representing true and false, respectively. You can assign them to boolean variables for use in logical expressions, conditional statements, and logical operations with other boolean types.