In Java, boolean is a basic data type with only two possible values: true and false. The boolean type is often used for conditional testing, such as comparison or checking whether a certain condition is met.
Here are some examples showing how to use boolean type in Java:
Declaring boolean variables:
boolean isTrue;
Assign a value to true or false:
isTrue = true;
or
isTrue = false;
Use a boolean expression in the if statement:
if (isTrue) { System.out.println("The statement is true."); } else { System.out.println("The statement is false."); }
Use boolean expressions in while statements:
boolean running = true; while (running) { // do something if (someCondition) { running = false; } }
Boolean logical operations (&&, ||, !):
boolean a = true; boolean b = false; // 使用&& (AND) 操作符 if (a && b) { System.out.println("Both a and b are true."); } else { System.out.println("At least one of a or b is false."); } // 使用|| (OR) 操作符 if (a || b) { System.out.println("At least one of a or b is true."); } else { System.out.println("Both a and b are false."); } // 使用! (NOT) 操作符 if (!a) { System.out.println("a is false."); } else { System.out.println("a is true."); }
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