数组

梦里梦外; 2023-08-17 16:08 11阅读 0赞

**1、一维数组**

*定义*

创建一个长度为50的数组：int\[\] arr=new int\[50\];

*遍历*

public class ArrayDemo {
        public static void main(String[] args) {
        int[] arr = {5,1,12,4,6,8,0,3};
        System.out.println("arr的遍历");
        for(int i = 0 ; i < arr.length; i++){
            System.out.print(arr[i]);
            System.out.print("\t");
        }
        }
    }

**2、二维数组**

*定义*

int\[\]\[\] arr = new int\[2\]\[4\];

int\[\]\[\] arr = new int\[5\]\[\];

int\[\]\[\] arr = \{ \{1,2,2\},\{3,4,5,6\},\{7,8,3,9\}\};

public class Array{
        public static void main(String[] args){
            int[] arr0 = {5,1,12,4,6,8,0,3};
            int[][] arr = { {1,2,3},
                            {
         4,5},
                            {
         6,7,8,9},
                            {
         0} };
            System.out.println("*********二维数组**********");
            System.out.println("1、元素求值：");
            System.out.println(arr[2][1]);//问题: 打印7,是数组中的元素0
            System.out.println(arr[3][0]);//问题: 输出结果
            System.out.println();
            System.out.print("2、遍历数组:");
            System.out.println();
            for(int i = 0 ; i < arr.length ;i++){
        //外循环,遍历二维数组  
                for(int j = 0 ; j < arr[i].length; j++){
        //内循环,遍历每个一维数组 arr[0] arr[1] arr[i]
                         System.out.print("  "+arr[i][j]+",");
                        }
                        System.out.println();
        }
            System.out.println();
            System.out.println("3、arr的属性");
            System.out.println("arr的行数为:"+arr.length);
            System.out.println("arr第四行元素个数为："+arr[3].length);
            }
    }

![1392562-20190728172429236-315769464.png][]

转载于:https://www.cnblogs.com/zhai1997/p/11260094.html

[1392562-20190728172429236-315769464.png]: /images/20230810/b49b3880e9f64342a3475a4d50515672.png