test.java

JAVA培训用实用代码

public class Test{  //Person,Student类的定义同示例7-6
	public void method(Person e) {
		//……
		String s = e.getInfo();
		System.out.println(s);
	}
	public static  void main(String args[]){
		Test t = new Test();
		Student m = new Student();
		t.method(m);
	}
}


class Person {
	protected String name;
	protected int age;
	public String getInfo() {
	   	return "Name: "+ name + "\n" +"age: "+ age;
	}
}

class Student extends Person {
	protected String school;
	public String getInfo() {
  	   	return  "name: "+ name + "\nage: "+ age 
	          + "\nschool: "+ school;
	}
}