Arrays的简单使用

1. copyOfRange 数组复制
2. toString() 转换为字符串
3. sort 排序
4. binarySearch 搜索
5. equals 判断是否相同
6. fill 填充

int[] b = Arrays.copyOfRange(a, 0, 3);

int a[] = new int[] { 18, 62, 68, 82, 65, 9 };
        String content = Arrays.toString(a);

public class HelloWorld {
    public static void main(String[] args) {
        int a[] = new int[] { 18, 62, 68, 82, 65, 9 };
        System.out.println("排序之前 :");
        System.out.println(Arrays.toString(a));
        Arrays.sort(a);
        System.out.println("排序之后:");
        System.out.println(Arrays.toString(a));

    }
}

public class HelloWorld {
    public static void main(String[] args) {
        int a[] = new int[] { 18, 62, 68, 82, 65, 9 };

        Arrays.sort(a);

        System.out.println(Arrays.toString(a));
        //使用binarySearch之前，必须先使用sort进行排序
        System.out.println("数字 62出现的位置:"+Arrays.binarySearch(a, 62));
    }
}

public class HelloWorld {
    public static void main(String[] args) {
        int a[] = new int[] { 18, 62, 68, 82, 65, 9 };
        int b[] = new int[] { 18, 62, 68, 82, 65, 8 };

        System.out.println(Arrays.equals(a, b));
    }
}

 Arrays.fill(a, 5);  //5个5