import java.util.*;
import java.io.*;

class MyComp implements Comparator<MyObj> {

    public int compare(MyObj mo1, MyObj mo2){
        if (mo1.y < mo2.y)
            return -1;
        if (mo1.y > mo2.y)
            return 1;
        return 0;
    }
}
class MyAnotherComp implements Comparator<MyObj> {

    public int compare(MyObj mo1, MyObj mo2){
        if (mo1.z < mo2.z)
            return -1;
        if (mo1.z > mo2.z)
            return 1;
        return 0;
    }
}

class MyObj implements Comparable<MyObj> {
    public int x;
    public int y;
    public int z;

    public MyObj(int x, int y, int z){
        this.x = x;
        this.y = y;
        this.z = z;
    }
    public int compareTo(MyObj mo){
        if (this.x < mo.x)
            return -1;
        if (this.x > mo.x)
            return 1;
        return 0;
    }
    public String toString(){
        return "[" + x + ", " + y + ", " + z + "]";
    }
}

public class Sandbox {


    public static void main(String args[]) {
        try {
            MyObj[] a = new MyObj[3];
            a[0] = new MyObj(1,2,3);
            a[1] = new MyObj(4,3,2);
            a[2] = new MyObj(3,1,2);

            for(int i = 0; i < a.length; ++i){
                System.out.print(a[i]);
            }
            System.out.println();
            Arrays.sort(a);
            for(int i = 0; i < a.length; ++i){
                System.out.print(a[i]);
            }
            System.out.println();
            Arrays.sort(a, new MyComp());
            for(int i = 0; i < a.length; ++i){
                System.out.print(a[i]);
            }
            System.out.println();
            Arrays.sort(a, new MyAnotherComp());
            for(int i = 0; i < a.length; ++i){
                System.out.print(a[i]);
            }
            System.out.println();

        } catch(Exception e){
            System.out.println(e);
            System.out.println("Unexpected error, sorry!");
        }
    }
}