class EmployeeInfo4{
    public int rank;
    EmployeeInfo4(int rank){ this.rank = rank; }
}
class Person4<T, S>{ //generic으로 원시 기본 data type 을 사용할 수 없다. 사용하고 싶다면 wrapper class 을 사용해야한다. 원시 기본 data type을 객체화 시키는것
    public T info;
    public S id;
    Person4(T info, S id){ 
        this.info = info; 
        this.id = id;
    }
    public <U> void printInfo (U info) {
    	System.out.println(info);
    }
}
public class GenericDemo4 {
    public static void main(String[] args) { //Integer => int 에 대한 wrapping class
 
    	System.out.println("");
    	System.out.println("Multiple Generic Demo\n");
 
    	EmployeeInfo4 e = new EmployeeInfo4(1); 
    	Integer i = new Integer(10);
        Person4<EmployeeInfo4, /*int*/Integer> p1 = new Person4<EmployeeInfo4, /*int*/Integer>(e, i);
        Person4 p2 = new Person4(e, i);
        //Person4 p1 = new Person4(new EmployeeInfo4(1), new Integer(10));
 
//p1        
        System.out.println(p1.info.rank);
        System.out.println(p1.id);
        System.out.println(p1.id.intValue());
        System.out.println("end\n");
 
        p1.<Integer>printInfo(e.rank);
        p1.printInfo(e.rank);
        p1.<Integer>printInfo(i);
        p1.printInfo(i);
        p1.<Integer>printInfo(i.intValue());
        p1.printInfo(i.intValue());
        System.out.println("end\n");
 
//p2        
        System.out.println(p2.info.rank); //=>오류 why?
        System.out.println(p2.id);
        System.out.println(p2.id.intValue()); //=>오류 why?
        System.out.println("end\n");
 
        p2.<Integer>printInfo(e.rank);
        p2.printInfo(e.rank);
        p2.<Integer>printInfo(i);
        p2.printInfo(i);
        p2.<Integer>printInfo(i.intValue());
        p2.printInfo(i.intValue());
        System.out.println("end\n");
 
    }
}

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