Arrays类的用法详述

java.util.Arrays 类能方便地操作数组，它提供的所有方法都是静态的。
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例子如下：

import java.util.Arrays;

public class Test3 {
    public static void main(String[] args) {
        int [] nums = {6,9,8,4,2};
        Arrays.sort(nums);
        System.out.println("------升序-----");
        for (int num : nums) {
            System.out.print(num+"");
        }

        System.out.println("\n------降序-----");
        for (int i = nums.length-1; i >=0 ; i--) {
            System.out.print(nums[i]+"");
        }

        System.out.println("\n------字符串排序-----");
        String [] mm = {"n","1","6","M","a","5"};
        Arrays.sort(mm);
        for (String s : mm) {
            System.out.print(s);
        }

        System.out.println("\n------判断两个数组是否相等-----");
        int [ ] num1 = {1,2,3};
        int [ ] num2 = {1,2,4};
        boolean b = Arrays.equals(num1, num2);
        System.out.print(b);

        System.out.println("\n------转换为字符串-----");
        int [] num3 = {5,6,4,5,8};
        String s = Arrays.toString(num3);
        System.out.print(s);

        System.out.println("\n------赋值相同数值-----");
        int [ ] num4 = {1,2,4};
        Arrays.fill(num4,66);
        for (int i : num4) {
            System.out.print(i+" ");
        }

        System.out.println("\n------复制为新数组-----");
        int [ ] num5 = {1,2,4};
        int[] num55 = Arrays.copyOf(num5, 5);
        for (int i : num55) {
            System.out.print(i);
        }

        System.out.println("\n------查询元素下标-----");
        int [ ] num6 = {1,2,4};
        int i = Arrays.binarySearch(num6, 4);
        System.out.println(i);
    }
}

运行结果如下：
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