JAVA import java.util.ArrayList; import java.util.Collections; import java.util.

Question

JAVA

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Cost {

Map<String, Item> items = new HashMap<String, Cost.Item>();

public void addItem(String name, int cost){
items.put(name, new Item(name, cost));
}

public void printCost(){
List<Item> itemList = new ArrayList<Cost.Item>();
items.forEach((k,v) -> itemList.add(v));
Collections.sort(itemList);
itemList.forEach(item -> System.out.println(item.toString()));
}

//inner class
public class Item implements Comparable<Item> {
String name;
int cost; // in cents
public Item(String n, int c) {
name = n;
cost = c;
}
public String toString() {
return name + " " + cost;
}
@Override
public int compareTo(Item o) {
int intCompare = Integer.compare(this.cost, o.cost);
if(intCompare == 0)
intCompare = this.name.compareTo(o.name);
return intCompare;
}
}
}

Explanation / Answer

import java.util.Arraylist;

import java.util.Collections;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class Cost

{

Map<String,item>items=new HashMap<String,Cost.item>();

public void additem(String name,intcost)

{

items.put(name,new item(name,cost));

}

public void printCost()

{

List<item>itemList = new ArrayList<cost.item>();

items.forEach((k,v)->itemList.add(v));

Collections.sort(itemList);

itemList.forEach(item->System.out.println(item.toString()));

}

//inner class

public class item implements Comparable<itam>

{

String name;

int cost;//in cents

public item(String n,int c)

{

name = n;

cost = c;

}

public String toString()

{

return name+""+cost;

}

@Override

public int compareTo(item 0)

int intCompare = integer.compare(this .cost,0.cost);

if(intCompare ==0)

intCompare = this.name.compareTo(0,name);

return intCompare;

}

}

}

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