GenericDemo

package com.test.ex;

class EmployeeInfo{

public String rank;

EmployeeInfo(String rank){

this.rank=rank;

}

}

class StudentInfo{

public int grade;

StudentInfo(int grade){

this.grade=grade;

}

}

class Person<T, S>{

public T info;

public S id;

Person(T info, S id){

this.info=info;

this.id=id;

}

public <U> void printInfo(U info){

System.out.println(info);

}

}

public class GenericDemo {

public static void main(String[] args) {

EmployeeInfo e = new EmployeeInfo("lee");

Integer i = new Integer(21);

Person<EmployeeInfo,Integer> p1 = new Person<EmployeeInfo,Integer>(e,i);

//Person p1 = new Person(e,i);

System.out.println(p1.info.rank);

System.out.println(p1.id.intValue());

StudentInfo a = new StudentInfo(55);

Person<StudentInfo,Integer> p2 = new Person<StudentInfo,Integer>(a, i);

System.out.println(p2.info.grade);

p1.<Integer>printInfo(a.grade);

}

}