VIPQ/JavaSE/day05/src/main/java/com/sf/Test2.java

package com.sf;

import javax.naming.InsufficientResourcesException;

public class Test2 {
    public static void main(String[] args) {
        /**
         * 有三个班级    每个班级有3个学生
         */
        String[] class1 = {"qq","ww","ee"};
        String[] class2 = {"rr","tt","yy"};
        String[] class3 = {"uu","ii","oo"};

        /**
         * 声明二维数组
         * 1、元素的数据类型[][] 二维数组的名称;
         * 2、元素的数据类型  二维数组名[][];
         * 3、元素的数据类型[]  二维数组名[];
         */
        String[][] classTwo;   //推荐
        String classTwo2[][];
        String[] classTwo3[];

        /**
         * 将三个班级，每个班级中的三个同学  都放在一个二维数组里
         * [][]
         *      第一个中括号代表的是 二维数组中的第一个元素
         *      第二个中括号代表的是  二维数组中的第一个元素（一维数组）中的每一个元素
         */
        String[][] className = {{"qq","ww","ee"},{"rr","tt","yy"},{"uu","ii","oo"}};
        for (int k = 0; k<className.length;k++){
            System.out.println("循环次数"+k);
            for (int z = 0;z < className[k].length;z++){
                String s = className[k][z];
                System.out.println(s);
                System.out.println("第一个元素的长度"+ className[k].length);

            }
        }

        String name = className[0][0];
//        System.out.println("qq"+name);
//        System.out.println("yy===>"+className[1][2]);

        String[][] className2 = new String[][]{{"qq","ww","ee"},{"rr","tt","yy"},{"uu","ii","oo"}};
        String[][] className3;
        className3 =  new String[][]{{"qq","ww","ee"},{"rr","tt","yy"},{"uu","ii","oo"}};

        /**
         * [1]  : 二维数组中 包含2个一维数组    行
         * [2]  : 每个一维数组中的元素个数为3个  列
         */
        String[][]  arr = new String[2][3];
        arr[0][0] = "张三0";
        arr[0][1] = "张三1";
        arr[0][2] = "张三2";
//        第二个一维数组赋值
        arr[1][0] = "张四0";
        arr[1][1] = "张四1";
        arr[1][2] = "张四2";

        System.out.println(arr[1][1]);
        /**
         * 获取二维数组的长度    获取二维数组中一维数组（第一个元素）的的长度
         */
        int length = arr.length;
        int length1 = arr[0].length;

        System.out.println(length);
        System.out.println("================="+length1);


        /**
         * 二维数组的遍历
         */
        String[][] name1 = new String[][]{{"qq","ww","ee"},{"rr","tt","yy"},{"uu","ii","oo"}};



        int[][] xs = {{12,14,24},{23,18,35},{33,48,25},{27,28,35}};
        int sum = 0;
        int count = 0; //数组长度
        for (int q = 0 ;q<xs.length;q++){
            for (int e = 0 ;e <xs[q].length;e++){
                sum+=xs[q][e];
                count++;
            }
        }
        System.out.println("总和为"+sum);
        System.out.println("平均值"+sum/count);
    }
}