alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

What this is

This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Other links

The source code

package p;

class A implements Bag {
	int size = 0;
	Comparable[] elems = new Comparable[10];
	/* (non-Javadoc)
	 * @see p.Bag#iterator()
	 */
	public java.util.Iterator iterator() {
		return new Iterator(this);
	}
	/* (non-Javadoc)
	 * @see p.Bag#add(java.lang.Comparable)
	 */
	public Bag add(Comparable e) {
		if (size + 1 == elems.length) {
			Comparable[] newElems = new Comparable[2 * size];
			System.arraycopy(elems, 0, newElems, 0, size);
			elems = newElems;
		}
		elems[size++] = e;
		return this;
	}
	/* (non-Javadoc)
	 * @see p.Bag#addAll(p.Bag)
	 */
	public Bag addAll(Bag v1) {
		java.util.Iterator i = v1.iterator();
		for (; i.hasNext(); add((Comparable) i.next()));
		return this;
	}
	public void sort() { /* insertion sort */
		for (int i = 1; i < size; i++) {
			Comparable e1 = elems[i];
			int j = i;
			while ((j > 0) && (elems[j - 1].compareTo(e1) > 0)) {
				elems[j] = elems[j - 1];
				j--;
			}
			elems[j] = e1;
		}
	}
}
class Iterator implements java.util.Iterator {
	private int count = 0;
	private A v2;
	Iterator(A v3) {
		v2 = v3;
	}
	public boolean hasNext() {
		return count < v2.size;
	}
	public Object next() {
		return v2.elems[count++];
	}
	public void remove() {
		throw new UnsupportedOperationException();
	}
}
class Client {
	public static void main(String[] args) {
		A v4 = createList();
		populate(v4);
		update(v4);
		sortList(v4);
		print(v4);
	}
	static A createList() {
		return new A();
	}
	static void populate(Bag v5) {
		v5.add("foo").add("bar");
	}
	static void update(Bag v6) {
		Bag v7 = new A().add("zap").add("baz");
		v6.addAll(v7);
	}
	static void sortList(A v8) {
		v8.sort();
	}
	static void print(Bag v9) {
		for (java.util.Iterator iter = v9.iterator(); iter.hasNext();)
			System.out.println("Object: " + iter.next());
	}
}
... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.