Java Collections工具类

package myutil;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;

public class Collections1 {
	public static void main(String[] args){
		ArrayList nums=new ArrayList();
		Random random=new Random(System.currentTimeMillis());
		for(int i=0;i<10;i++)
			nums.add(random.nextInt(100));
		System.out.println("original:\n"+nums);
		Collections.reverse(nums);
		System.out.println("reverse:\n"+nums);
		Collections.sort(nums);
		System.out.println("sort:\n"+nums);
		Collections.shuffle(nums);
		System.out.println("shuffle:\n"+nums);
		System.out.println("max:\n"+Collections.max(nums));
		System.out.println("min:\n"+Collections.min(nums));
		System.out.println("frequency of "+nums.get(0)+":\n"+Collections.frequency(nums, nums.get(0)));
		System.out.println("binarySearch of "+nums.get(4)+":\n"+Collections.binarySearch(nums, nums.get(4)));
		int orginal=nums.get(2);
		Collections.replaceAll(nums, orginal, 88);
		System.out.println("replaceAll of "+orginal+" to value 88:\n"+nums);
	}

}