package com.sxt.arraytest2;

/*

 * 数组的工具类

 */

import java.util.Arrays;

public class TestArrays {

    public static void main(String[] args) {

        int[] arr = new int[10];

        Arrays.fill(arr, 111);//填充所有元素为111

        System.out.println(Arrays.toString(arr));//遍历数组

        Arrays.fill(arr, 0, 4, 555);//填充下标0-4所有元素为111

        System.out.println(Arrays.toString(arr));//遍历数组

        int[]arr2 = {34,43,34,54,432};

        int[]arr3 = {1,2,3,4,5};

        System.out.println(Arrays.equals(arr2, arr3));//false

        int[]arr4 = new int[5];

        int[]arr5 = new int[5];

        System.out.println(Arrays.equals(arr4, arr5));//true  看API 比较的是值

        Arrays.sort(arr2);//排序  DualPivotQuicksort

        System.out.println(Arrays.toString(arr2));

        //数组的复制：生成新的数组

        int[] arr6 = Arrays.copyOf(arr3,10);//注意生成新的数组！！

        System.out.println(Arrays.toString(arr6));

        System.out.println("-----------------------");

        //数组的复制：不会生成新的数组

        System.arraycopy(arr2, 0, arr3, 0, 3);

        System.out.println(Arrays.toString(arr3));

        //数组的合并

        int[]arr7 = new int[arr2.length+arr3.length];

        for(int i=0; i<arr2.length; i++){

            arr7[i] = arr2[i];

        }

        for(int i=arr2.length; i<arr7.length; i++){

            arr7[i] = arr3[i-arr2.length];//找规律

        }

        System.out.println(Arrays.toString(arr7));

    }

}