import java.util.*;
/*
Arrays.
    toString
    sort
    binarySearch
    copyOf
    equals
 */
public class ArraysTest1 {
    public static void main(String[] args) {

        int[] arr = {90,-1,-100,10,20,30};
        System.out.println(Arrays.toString(arr));

        //排序
        Arrays.sort(arr);
        System.out.println(Arrays.toString(arr));
        //二分查找   有序
        int index = Arrays.binarySearch(arr, 20);
        System.out.println("index = " + index);


        String [] arr1 = {"安琪拉","米莱迪","妲己"};


       // String[] newArr = Arrays.copyOf(arr1, arr1.length*2);
        arr1 = Arrays.copyOf(arr1, arr1.length*2);

        System.out.println("Arrays.toString(arr1) = " + Arrays.toString(arr1));


        /*
        按照范围复制
         Arrays.copyOfRange(数组名, 开始下标, 结束下标);
       结果 [开始下标, 结束下标)
         */
        String[] strings = Arrays.copyOfRange(arr1, 0, 2);

        System.out.println("Arrays.toString(strings) = " + Arrays.toString(strings));//"安琪拉","米莱迪"



        int[] arr3 = new int[6];

        System.out.println("Arrays.toString(arr3) = " + Arrays.toString(arr3));

        //Arrays.fill(arr3, 66);

        /*
        按照范围填充
          Arrays.fill(数组名, 开始下标, 结束下标, 填充的值);
          [开始下标, 结束下标)
         */
        Arrays.fill(arr3, 1, 4, 88);


        System.out.println("Arrays.toString(arr3) = " + Arrays.toString(arr3));



        int [] arr4 = {1,2,3};
        int [] arr5 = {1,3,2};
        //数组== 比较的是地址值
        System.out.println(arr4==arr5);
            //比较的是数组元素的内容  按照下标逐个比较
        boolean flag = Arrays.equals(arr4, arr5);
        System.out.println("flag = " + flag);
        System.out.println(10==10);//true

    }
}