Head First Java Chapter 17 Pg 554

Code:


package hpg_554;

import java.util.*;

public class Main {

LinkedList<Mountain> mtn = new LinkedList<Mountain>();


class Mountain {

String Name;
Integer Height;

public Mountain (String n, Integer h) {
Name = n;
Height = h;
}

public String getName() {
return Name;
}

public Integer getHeight() {
return Height;
}
}



public class NameCompare implements Comparator<Mountain>{
public int compare (Mountain one, Mountain two){
return one.getName().compareTo(two.getName());
}
}
public class HeightCompare implements Comparator<Mountain>{
public int compare (Mountain one, Mountain two){
return one.getHeight().compareTo(two.getHeight());
}

}

public static void main(String[] args) {
new Main().go();
}

public void go(){
mtn.add(new Mountain("Longs", 14255));
mtn.add(new Mountain("Elbert",14433));
mtn.add(new Mountain("Maroon",14256));
mtn.add(new Mountain("Castle",14264));

System.out.println("as emntered : \n " + mtn);
System.out.println();
NameCompare nc = new NameCompare();
System.out.println(mtn);

Collections.sort(mtn,nc);
System.out.println();
System.out.println("by name : \n" + mtn);

HeightCompare hc = new HeightCompare();
Collections.sort(mtn,hc);
System.out.println();
System.out.println("By Height: \n" + mtn);

}



}






Result :
(IMG:https://forums.oreilly.com/style_emoticons/default/ohmy.gif) (IMG:https://forums.oreilly.com/style_emoticons/default/ohmy.gif) (IMG:https://forums.oreilly.com/style_emoticons/default/mellow.gif)
run:
as emntered :
[hpg_554.Main$Mountain@19821f, hpg_554.Main$Mountain@addbf1, hpg_554.Main$Mountain@42e816, hpg_554.Main$Mountain@9304b1]

[hpg_554.Main$Mountain@19821f, hpg_554.Main$Mountain@addbf1, hpg_554.Main$Mountain@42e816, hpg_554.Main$Mountain@9304b1]

by name :
[hpg_554.Main$Mountain@9304b1, hpg_554.Main$Mountain@addbf1, hpg_554.Main$Mountain@19821f, hpg_554.Main$Mountain@42e816]

By Height:
[hpg_554.Main$Mountain@19821f, hpg_554.Main$Mountain@42e816, hpg_554.Main$Mountain@9304b1, hpg_554.Main$Mountain@addbf1]
BUILD SUCCESSFUL (total time: 1 second)