# 2017-11-03 周测试题 在 Eclipse 中新建项目，将以下试题完成，时间 60 min。 **注意：格式，命名规范，注释** 1、实现在控制台输出九九乘法表。 ~~~ public class Test { public static void main(String[] args) { for (int i = 1; i <= 9; i++) { for (int j = 1; j <= i; j++) { System.out.print("" + i + " * " + j + " = " + (i * j) + "\t"); } System.out.println(); } } } ~~~ 2、定义方法sum，要求实现两个数之和的运算，要求在main方法中调用。 ~~~ public class Test2 { public static int sum(int a, int b) { return a + b; } public static void main(String[] args) { int i = 10; int j = 20; System.out.println("" + i + " + " + j + " = " + Test2.sum(i, j) + ""); } } ~~~ 3、请写一个方法打印数组的内容，实现遍历数组，要求在main方法中调用。 > 提示：在main方法中定义一个数组，然后将数组作为参数传给方法，在方法中打印结果"[a,b,c,....]" ~~~ public class Test3 { public static void main(String[] args) { String[] arr1 = {"a","b","c"}; String[] arr2 = {}; String[] arr3 = null; System.out.println(printArray(arr1)); System.out.println(printArray(arr2)); System.out.println(printArray(arr3)); } public static String printArray(String[] arr) { // [a,b,c] String result = ""; if (null == arr) { result = "数组为null"; } else { if (arr.length == 0) { result = "数组长度为 0"; } else { result = "["; for (int i = 0; i < arr.length; i++) { if (i == arr.length - 1) { result += arr[i]; } else { result += arr[i] + ","; } } result += "]"; } } return result; } } ~~~ 4、请将消费者在商城购物这个场景抽象出类，并编写一个客户端类，实现“小明在欧尚买了一件T恤”这样一个购物行为。 ~~~ public class Customer { private String name; public Customer(String name) { super(); this.name = name; } public String getName() { return name; } public void setName(String name) { this.name = name; } } ~~~ ~~~ public class Market { private String name; public Market(String name) { super(); this.name = name; } public String getName() { return name; } public void setName(String name) { this.name = name; } } ~~~ ~~~ public class Product { private String name; public Product(String name) { super(); this.name = name; } public String getName() { return name; } public void setName(String name) { this.name = name; } } ~~~ ~~~ public interface ShoppingServiceInter { void shopping(Customer cus, Market market, Product product); } ~~~ ~~~ public class ShoppingService implements ShoppingServiceInter { public void shopping(Customer cus, Market market, Product product) { System.out.println("" + cus.getName() + "在" + market.getName() + "买了" + product.getName() + ""); } } ~~~ ~~~ public class Client { public static void main(String[] args) { Customer tom = new Customer("Tom"); Market ous = new Market("欧尚"); Product tsh = new Product("T恤"); ShoppingServiceInter service = new ShoppingService(); service.shopping(tom, ous, tsh); } } ~~~