arrays工具类

//arrays工具类的使用
        int[] number = new int[]{1,2,3,4};
        int[] numbers = new int[]{1,2,3,4};
        //是否相等
        boolean isequal= Arrays.equals(number,numbers);
        System.out.println(isequal);
        //直接输出信息
        System.out.println(Arrays.toString(number));
        //将数组全部改成一个元素
        Arrays.fill(number,10);
        System.out.println(Arrays.toString(number));
        //排序
        Arrays.sort(numbers);
        System.out.println(Arrays.toString(numbers));
        //二分查找，前提数组有序，否则报错
        int index= Arrays.binarySearch(numbers,4);
        if(index>0){
            System.out.println(index);
        }