package Collection;

import java.util.*;

/**
 * collection   小工具
 *
 * @author liu
 */
public class Demo01 {
    public static void main(String[] args) {
        List<Integer> arrayList = new ArrayList<>();
        arrayList.add(1);
        arrayList.add(12);
        arrayList.add(21);
        arrayList.add(15);
        arrayList.add(15);
        arrayList.add(16);

        //sort排序
        System.out.println("排序前：" + arrayList);
        Collections.sort(arrayList);
        System.out.println("排序後：" + arrayList);


        //binarySearch查詢
        System.out.println("--------查詢-----------");
        int i = Collections.binarySearch(arrayList, 15);
        System.out.println(i);

        //copy複製,需要新增元素
        System.out.println("--------複製-----------");
        List<Integer> listt = new ArrayList<>();
        for (int k = 0; k < arrayList.size(); k++) {
            listt.add(0);
        }
        Collections.copy(listt, arrayList);
        System.out.println(listt);

        //reverse反轉
        System.out.println("--------反轉-----------");
        Collections.reverse(listt);
        System.out.println(listt);

        //shuffle打亂
        System.out.println("--------打亂-----------");
        Collections.shuffle(listt);
        System.out.println(listt);

        //補充list轉陣列
        System.out.println("--------集合轉陣列-----------");
        Integer[] A = listt.toArray( new Integer[10]);
        System.out.println(Arrays.toString(A));

        //陣列轉集合
        System.out.println("--------陣列轉集合-----------");
        String[] name ={"張三","李思","王五"};
        //轉集合後，是一個受限集合，不能新增、刪除
        List<String> strList = Arrays.asList(name);
        //strList.add("2");
        //strList.remove(0);
        System.out.println(strList);

        //陣列轉集合，型別不能為int,需要修改為包裝型別
        Integer[] nums = {1,2,5,7,1,1,22};
        List<Integer> list1 =Arrays.asList(nums);
        System.out.println(list1);
    }
}