collectionsort.java

高质量Java程序设计 源代码

package net.betterjava.collection.sort;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

public class CollectionSort {
	public static void main(String[] args) {
		List list = new ArrayList();
		for (int i = 0; i < 6; i++) {
			list.add(String.valueOf(Math.random()));
		}

		//before sort
		Iterator it = list.iterator();
		System.out.println("before sort");
		while (it.hasNext()) {
			System.out.println(it.next());
		}

		//Collections.sort(Collections.unmodifiableList(list));
		Collections.sort(list);

		//after sort
		it = list.iterator();
		System.out.println("after sort");
		while (it.hasNext()) {
			System.out.println(it.next());
		}

		Collections.reverse(list);

		//after reverse
		it = list.iterator();
		System.out.println("after reverse");
		while (it.hasNext()) {
			System.out.println(it.next());
		}
	}
}