test.java

来自「本人在JAVA学习中的一点小实验」· Java 代码 · 共 26 行

// Test.java
class Employee{}
class Manager extends Employee{}
class Secretary extends Employee{}
class Programmer extends Employee{}

public class Test{
  public void method(Employee e){
    if(e instanceof Manager)
      System.out.println("He is a Manager.");
    else if(e instanceof Secretary)
       System.out.println("He is a Secretary.");
    else if(e instanceof Programmer)
       System.out.println("He is a Programmer.");
  }
 public static void main(String args[]){
    Test t=new Test();
    Manager m=new Manager();
    Secretary s=new Secretary();
    Programmer p=new Programmer();
    t.method(m);
    t.method(s);
    t.method(p);
  }
}