铂西学习日记---Collections工具类

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

public class CollectionsDemo {
    
    public static void main(String[] args) {
        demo1();
    }

    public static void demo1(){
        List list = new ArrayList<>();
        list.add("JACK");
        list.add("TOM");
        list.add("LILY");
        list.add("LIU");
        list.add("ZHANG");
        list.add("GUI");

        

//        Collections.reverse(list);
//        Collections.shuffle(list);
//        Collections.sort(list);
        //Collections.sort(list,Comparator c); 自定义比较器
//        Collections.swap(list,0,1);
//        Collections.rotate(list,1);
        System.out.println(list);

        

        //二分查找时一定要先排序
        Collections.sort(list);
        int tomIndex = Collections.binarySearch(list, "TOM");
        System.out.println(list.get(tomIndex));

        System.out.println(Collections.max(list));
        System.out.println(Collections.min(list));

//        Collections.fill(list,"刘铂西");
        System.out.println(list);

//        System.out.println(Collections.frequency(list,"刘铂西"));

//        Collections.replaceAll(list,"刘铂西","lsq666");
        System.out.println(list);

        
        List