10.23

package cn.zaoren;

public class L {

         public int id;
        public String name;
        public int age;
        public String city;
        public String introduce() {
            return  + id +  ":   姓名：  " + name + ", 年龄：" + age + ", 国家" + city ;
        }  
    

}

package cn.zrjh;

public class Y {

    public static void main(String[] args) {
        L p1=new L();
        L p2=new L();
        L p3=new L();
        L p4=new L();
        p1.id=001;   p1.name="老A";   p1.age=250;   p1.city="earth";
        p2.id=002;   p2.name="老B";   p2.age=250;   p2.city="earth";
        p3.id=003;   p3.name="老C";   p3.age=250;   p3.city="earth";
        p4.id=004;   p4.name="老D";   p4.age=250;   p4.city="earth";
        System.out.println(p1.introduce());
        System.out.println(p2.introduce());
        System.out.println(p3.introduce());
        System.out.println(p4.introduce());

    }

}