import java.util.*;
class Student1 {

	String name;
	int id;
	double perc;

	Student1(int id, String name, double perc){
		this.id = id;
		this.name = name;
		this.perc = perc;
	}

	void display() {
		System.out.println(id + "\t" + name + "\t" + perc);
	}
}
class StudNameSort implements Comparator<Student1>{

	@Override
	public int compare(Student1 rc, Student1 kr) {
		// TODO Auto-generated method stub
		return rc.name.compareTo(kr.name);
	}
}

class StudIdSort implements Comparator<Student1>{

	@Override
	public int compare(Student1 rc, Student1 kr) {
		// TODO Auto-generated method stub
		if(rc.id == kr.id)
			return 0;
		else if(rc.id > kr.id)
			return 1;
		else
			return -1;
	}
}

public class ComparatorDemo {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Student1 s1 = new Student1(526,"Raju", 97.67);
		Student1 s2 = new Student1(556,"Ramu", 77.67);
		Student1 s3 = new Student1(546,"Raju", 67.67);
		Student1 s4 = new Student1(536,"Chythu", 87.67);
		ArrayList<Student1> al = new ArrayList<Student1>();
		al.add(s1);
		al.add(s2);
		al.add(s3);
		al.add(s4);
		System.out.println("Before Sorting: ");
		Iterator<Student1> i = al.iterator();
		while(i.hasNext()) {
			Student1 s = (Student1)i.next();
			s.display();
		}
		System.out.println("After Name-wise Sorting: ");
		Collections.sort(al,new StudNameSort());
		Iterator<Student1> i1 = al.iterator();
		while(i1.hasNext()) {
			Student1 s = (Student1)i1.next();
			s.display();
		}
		System.out.println("After Id-wise Sorting: ");
		Collections.sort(al,new StudIdSort());
		Iterator<Student1> i2 = al.iterator();
		while(i2.hasNext()) {
			Student1 s = (Student1)i2.next();
			s.display();
		}
	}
}