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package com.course.objects;

import java.util.Comparator;

import java.util.ArrayList;

import java.util.Collections;

/**

*

* @author rafiul

* There are two general way for comparing of objects in java

* First: Implement Comparable Interface in your object which

* have an abstract method name compareTo(Object o). Which will

* allow your object to compare with other same class objects

*

* Second: Use Comparator Interface which which allow you to create

* an instant compare functionality with its abstract method name

* compare(Object o1, Object o2)

*/

class Box implements Comparable<Box>{

public int h;

public int w;

public int l;

public Box(int h, int w, int l){

this.h = h;

this.w = w;

this.l = l;

}

public int compareTo(Box o){

if(o.h > this.h) return 1;

if(o.h < this.h) return -1;

return 0;

}

public String toString(){

return String.format("h: %d, w: %d, l: %d",h,w,l);

}

}

public class ObjectCompare{

public static void main(String[] args) {

ArrayList<Box> list1 = new ArrayList<Box>();

list1.add(new Box(2,4,6));

list1.add(new Box(1,2,3));

list1.add(new Box(4,8,12));

Collections.sort(list1);

System.out.println("First Example");

for(Box b : list1){

System.out.println(b);

}

/*-----------------------------------------------*/

Comparator<Box> c = new Comparator<Box>(){

public int compare(Box o1, Box o2){

if(o1.h > o2.h) return 1;

if(o1.h < o2.h) return -1;

return 0;

}

};

ArrayList<Box> list2 = new ArrayList<Box>();

list2.add(new Box(2,4,6));

list2.add(new Box(1,2,3));

list2.add(new Box(4,8,12));

list2.sort(c);

System.out.println("Second Example");

for(Box b : list2){

System.out.println(b);

}

}

}