Java 基础 - instanceof关键字

instanceof 父类子类

结论：

• 子类 instanceof 父类 == true
• 父类 instanceof 子类 == false

public class Test {

 public static void main(String[] args) {
  //instanceof 父类子类
  Father father1 = new Father();
  System.out.println(father1 instanceof Father ); //ture
  System.out.println(father1 instanceof Son ); //false

  Father father2 = new Son();
  System.out.println(father2 instanceof Father ); //ture
  System.out.println(father2 instanceof Son ); //ture

  Son son = new Son();
  System.out.println(son instanceof Father ); //ture
  System.out.println(son instanceof Son ); //ture
 }
}