# 2018-05-11 周測試題 在 Eclipse 中新建項目，將以下試題完成，時間 60 min。 **注意：格式，命名規范，注釋** 1、實現在控制臺輸出九九乘法表。 ~~~ 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、定義方法sum，要求實現兩個數之和的運算，要求在main方法中調用。 ~~~ 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、請寫一個方法打印數組的內容，實現遍歷數組，要求在main方法中調用。 > 提示：在main方法中定義一個數組，然后將數組作為參數傳給方法，在方法中打印結果"[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 = "數組為null"; } else { if (arr.length == 0) { result = "數組長度為 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、請將消費者在商城購物這個場景抽象出類，并編寫一個客戶端類，實現“小明在歐尚買了一件T恤”這樣一個購物行為。 ~~~ 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() + "買了件" + product.getName() + ""); } } ~~~ ~~~ public class Client { public static void main(String[] args) { Customer customer = new Customer("小明"); Market market = new Market("歐尚"); Product product = new Product("T恤"); ShoppingService service = new ShoppingService(); service.shopping(customer, market, product); } } ~~~