Question

Define the Bag class in the file Bag.java with the following structure. Define the public methods listed, including the constructors. You may add fields to the class as necessary.

// A class representing a bag of items

public class Bag {

}

// Construct a bag, initially empty, with the indicated weight that it can hold (in ounces)

public Bag ( int weight ) { ... }

// Construct a bag, initially empty, with an assumed weight of 20 ounces.

public Bag ( ) { ... }

// return the current weight of items in the bag

public int currentWeight ( ) { ... }

// put moreOunces into the bag – but never more than the weight that it can hold.

public void addItems ( int moreOunces ) { ... }

// remove amount ounces from the bag (or as many as possible when not enough is present) // return how many were actually removed.
public int removeItems ( int amount ) { ... }

Example Uses of Bag

Below is the file UseBag.java, showing usage of the Bag class. Your code should compile/run with this code.

public class UseBag {
public static void main(String[] args){

Bag b = new Bag(10); System.out.println(b.currentWeight());

b.addItems(3);

System.out.println(b.currentWeight());

b.addItems(50);

System.out.println(b.currentWeight());

int got = b.removeItems(8);

System.out.println("removed "+got+" ounces");

System.out.println(b.currentWeight());

got = b.removeItems(5);

System.out.println("removed "+got+" ounces"); System.out.println(b.currentWeight());

Bag b2 = new Bag();
b2.addItems(30); System.out.println(b2.currentWeight());

}

}

Answer 1

Following is the answer:

Bag.java

package Bag;

public class Bag {
    private int weight;
    public int ounces = 0;

    //constructor with parameter weight
    public Bag(int weight){
        this.weight = weight;
    }

    //Default constructor that assumes the weight 20
    public Bag(){
        this.weight = 20;
    }

    //addItems method that add the ounces 
    public void addItems(int moreOunces){
        //if ounces less than weight the add it else add remaining ounces (substract from weight and find how many are remaining)
        if(moreOunces <= weight ){
            ounces+=moreOunces;
        }else{
            ounces+=weight-ounces;
        }
    }

    //removes items from if amount is greater than ounces available then removes all the ounces
    public int removeItems(int amount){
        int a;
        if(amount >= ounces){
            ounces=0;
        }else{
            ounces=ounces-amount;
        }
        return amount;
    }

    public int currentWeight() {
        return ounces;
    }
}

UseBag.java

package Bag;

public class UseBag {
    public static void main(String[] args){

        Bag b = new Bag(10); System.out.println(b.currentWeight());

        b.addItems(3);

        System.out.println(b.currentWeight());

        b.addItems(50);

        System.out.println(b.currentWeight());

        int got = b.removeItems(8);

        System.out.println("removed "+got+" ounces");

        System.out.println(b.currentWeight());

        got = b.removeItems(5);

        System.out.println("removed "+got+" ounces"); System.out.println(b.currentWeight());

        Bag b2 = new Bag();
        b2.addItems(30);
        System.out.println(b2.currentWeight());

    }
}

output: