简单的数组、二位数组
 1 package com.lovo; 2  3 import java.util.Scanner; 4  5 /** 6  * 二维数组 7  *  8  * @author 王启文 9  * 10  */11 12 public class D2 {13     public static void main(String[] args) {14         Scanner sc = new Scanner(System.in);15 16         String[] names = { "赵大", "钱二", "孙三", "李四", "周五" };17         String[] course = { "语文", "数学", "英语" };18         double[][] scores = new double[5][3];19 20         for (int i = 0; i < scores.length; ++i) {21             System.out.println("请输入" + names[i] + "的成绩：");22             for (int j = 0; j < scores[i].length; ++j) {23                 System.out.print("\t" + course[j] + ":");24                 scores[i][j] = sc.nextDouble();25             }26         }27 28         double ChSum = 0;29         double MaSum = 0;30         double EnSum = 0;31 32         for (int i = 0; i < scores.length; ++i) {33             double sum = 0;34             for (int j = 0; j < scores[i].length; ++j) {35                 sum += scores[i][j];36                 if (j == 0) {37                     ChSum += scores[i][j];38                 }39                 if (j == 1) {40                     MaSum += scores[i][j];41                 }42                 if (j == 2) {43                     EnSum += scores[i][j];44                 }45             }46             System.out.printf("%s的平均分为：%.2f\n", names[i], sum47                     / scores[i].length);48         }49 50         System.out.printf("语文的平均分为：%.2f\n", ChSum / names.length);51         System.out.printf("数学的平均分为：%.2f\n", MaSum / names.length);52         System.out.printf("英语的平均分为：%.2f\n", EnSum / names.length);53 54         sc.close();55     }56 }

 1 package com.lovo; 2  3 /** 4  * 杨辉三角 5  *  6  * @author 王启文 7  *  8  */ 9 public class D3 {10     public static void main(String[] args) {11         int[][] h = new int[10][];12 13         for (int i = 0; i < h.length; ++i) {14             h[i] = new int[i + 1];15             for (int j = 0; j < h[i].length; ++j) {16                 if (j == 0 || j == i) {17                     h[i][j] = 0;18                 } else {19                     h[i][j] = h[i - 1][j] + h[i - 1][j - 1];20                 }21                 System.out.print(h[i][j] + "\t");22             }23             System.out.println();24         }25     }26 }