package pjh1;public class A {    public int id;    public String name;    public int age;    public String city;    public String introduce() {    return "我的ID是" + id + ", 名字是" + name + ", 年龄是" + age + ", 居住地是" + city ;    } }

package pjh1;public class B {    public static void main(String[] args) {        // TODO Auto-generated method stub        A p1=new A();        A p2=new A();        A p3=new A();        A p4=new A();        p1.id=110001; p1.name="刘备";        p1.age=43; p1.city="蜀国";        p2.id=110002; p2.name="关羽";        p2.age=35; p2.city="蜀国";        p3.id=110003; p3.name="张飞";        p3.age=32; p3.city="蜀国";        p4.id=110004; p4.name="诸葛亮";        p4.age=25; p4.city="蜀国";        System.out.println(p1.introduce());        System.out.println(p2.introduce());        System.out.println(p3.introduce());        System.out.println(p4.introduce());        }}