《面向?qū)ο蟪绦蛟O(shè)計》試題.doc

《《面向?qū)ο蟪绦蛟O(shè)計》試題.doc》由會員分享，可在線閱讀，更多相關(guān)《《面向?qū)ο蟪绦蛟O(shè)計》試題.doc（8頁珍藏版）》請在裝配圖網(wǎng)上搜索。

裝訂線得分一、程序修改（20分）說明：描述程序中的語法錯誤原因并修改，每小題4分，錯誤原因和改正錯誤各2分。1. isPrime方法用于檢查參數(shù)num是否是質(zhì)數(shù)。public boolean isPrime(int num) boolean result = false; for(int i=2; i=num) result = true; return result;2. 具體類Reader實現(xiàn)了Readable接口。interface Readable void read(); class Reader implements Readable void read() System.out.println(I Can read it.); 3. main方法調(diào)用重載的max方法求2個數(shù)的最大值。public class Error03 public static double max(int a, double b) return a b ? a : b; public static double max(double a, int b) return a b ? a : b; public static void main(String args) double c = max(10, 100); 4. 子類Child覆蓋了父類Parent中的output方法。class Parent public final void output() System.out.println(Parent); class Child extends Parent public void output() System.out.println(Child); 5. main方法調(diào)用sum方法求數(shù)組所有元素的和。public class Error05 public double sum(double array) double result = 0; for (double value : array) result += value; return result; public static void main(String args) double arr = 1.0, 2.0, 3.0, 4.0, 5.0; System.out.println(sum(arr); 得分二、程序填空（20分）說明：填充程序中的空白，使程序能夠正確運行，每空2分。1. 以下程序功能為輸入多個班的考試成績，并分別計算每個班的總成績。import java.util.Scanner;public class Score /inputScore方法用于輸入一個班的所有成績，參數(shù)num是班級的學(xué)生人數(shù) public static double inputScore(int num) double array = new doublenum; Scanner scanner = new Scanner(System.in); for (int i = 0; i (1) ; i+) arrayi = scanner.nextDouble(); return array; public static double sumScore(double array) double result = 0; for (int i = 0; i array.length; i+) result += arrayi; return result; public static void main(String args) double scores; int numOfClass, numOfStudent; Scanner scanner = new Scanner(System.in); System.out.print(一共有幾個班？); numOfClass = scanner.nextInt(); scores = (2) ; for (int i = 0; i numOfClass; i+) System.out.println(第 + (i + 1) + 班有幾人?); numOfStudent = scanner.nextInt(); scoresi = inputScore( (3) ); for (int i = 0; i numOfClass; i+) System.out.print(第 + (i + 1) + 班的總分：); System.out.println(sumScore( (4) ); 2. 以下程序定義了Circle和Cylinder兩個類。/類1，Circle.javapublic class Circle private double radius; /圓的半徑 public Circle() /無參構(gòu)造方法 (5) /調(diào)用有參構(gòu)造方法將radius初始化為0.0 public Circle(double radius) (6) /把參數(shù)radius賦給數(shù)據(jù)域radius public double getArea() return (7) ; /求圓的面積，使用Math.PI public double getRadius() return radius; public void setRadius(double r) radius = r; /類2，Cylinder.javapublic class Cylinder extends Circle private double height; /圓柱的高度 public Cylinder() /無參構(gòu)造方法 this.height = 0.0; public Cylinder(double radius, double height) （8） ; /調(diào)用父類構(gòu)造方法將radius初始化為參數(shù)radius this.height = height; Override public double getArea() double area1 = (9) ; /求圓柱表面積double area2 = (10) ; /求圓柱的底面積return area1 + area2; public double getHeight() return height; public void setHeight(double height) this.height = height; 得分三、閱讀程序（20分）說明：閱讀以下每段程序，寫出運行的結(jié)果，每小題5分。1. 閱讀程序1class Data public int a = 10, b = 100; public class Read01 public static void main(String args) int a = 10, b = 100; int array = 10, 100; Data data = new Data(); System.out.println(a= + a + ,b= + b); System.out.println(array0= + array0 + ,array1= + array1); System.out.println(data.a= + data.a + ,data.b= + data.b); swap(a, b); swap(array); swap(data); System.out.println(a= + a + ,b= + b); System.out.println(array0= + array0 + ,array1= + array1); System.out.println(data.a= + data.a + ,data.b= + data.b); public static void swap(int a, int b) int t = a; a = b; b = t; public static void swap(int array) int t = array0; array0 = array1; array1 = t; public static void swap(Data data) int t = data.a; data.a = data.b; data.b = t; 2. 閱讀程序2public class Read02 public static void main(String args) A x = new B(); System.out.println(1)x.i: +x.i); System.out.println(2)(B)x.i: +(B)x).i); System.out.println(3)x.j: +x.j); System.out.println(4)(B)x.j: +(B)x).j); System.out.println(5）x.m1(): +x.m1(); System.out.println(6）(B)x.m1(): +(B)x).m1(); System.out.println(7）x.m2(): +x.m2(); System.out.println(8）x.m3(): +x.m3(); class A public int i=1; public static int j=11; public static String m1() return 類A的靜態(tài)方法m1.; public String m2() return 類A的實例方法m2.; public String m3() return 類A的實例方法m3.;class B extends A public int i=2; public static int j=22; public static String m1() return 類B的靜態(tài)方法m1.; public String m2() return 類B的實例方法m2.;3. 閱讀程序3class Person public Person() System.out.println(Person(); class Employee extends Person public Employee() this(調(diào)用Employee(s); System.out.println(Employee(); public Employee(String s) System.out.println(s); class Faculty extends Employee public Faculty() System.out.println(Faculty(); class Test public static void main(String args) new Faculty(); 4. 閱讀程序4, 分別寫出?處的值是30和50的輸出結(jié)果。public class Read04 public static void main(String args) int value = ?; try if(value40) throw new Exception(value is too small); System.out.println(value=+value); catch (Exception e) System.out.println(e.getMessage(); finally System.out.println(process finished); System.out.println(program continued); 四、程序設(shè)計（40分）1. 設(shè)計并編寫一個名為MyPoint的類表示平面上一個具有x坐標(biāo)和y坐標(biāo)的點，完成以下要求：（15分）l 將該類放置于包prog01中；l 兩個double類型數(shù)據(jù)域x和y表示坐標(biāo)，并進(jìn)行封裝；l 無參構(gòu)造方法創(chuàng)建點(0.0, 0.0); 有參構(gòu)造方法按指定坐標(biāo)創(chuàng)建一個點；l 方法distance返回當(dāng)前點對象到參數(shù)點對象之間的距離；l 編寫測試類TestMyPoint，其main方法中創(chuàng)建兩個點(0.0, 0.0)和(10.0, 35.5)，輸出這兩個點之間的距離。2根據(jù)材料完成程序代碼（15分）。要求利用多態(tài)性計算若干不同類型幾何圖形的面積之和，類與接口的關(guān)系見下面的類圖。類CricleV1，類RectangleV1和測試類Tester的源碼已經(jīng)給出。CircleV1.javapublic class CircleV1 private double radius; public CircleV1() this(1.0); public CircleV1(double radius) this.radius = radius; public double getRadius() return radius; public void setRadius(double radius) this.radius = radius; RectangleV1.javapublic class RectangleV1 private double width; private double height; public RectangleV1() this(1.0, 1.0); public RectangleV1(double width, double height) this.width = width; this.height = height; public double getWidth() return width; public void setWidth(double width) this.width = width; public double getHeight() return height; public void setHeight(double height) this.height = height; Tester.javapublic class Tester public static void main(String args) Object shapes = new CircleV2(10), / new RectangleV2(10, 2), / new CircleV2(), / new RectangleV2() / ; System.out.println(sumArea(shapes); public static double sumArea(Object shapes) double result = 0; for (int i = 0; i shapes.length; i+) if (shapesi instanceof CalcArea) / result += (CalcArea) shapesi).getArea(); / return result; 請根據(jù)以上給定的材料，完成以下代碼，使的Tester類中的main方法能夠順利運行。注意Tester類中行尾有“/”標(biāo)注的行使用了你需要完成的接口和類。(1) 編寫完成接口CalcArea.java。（5分）(2) 編寫完成類CircleV2.java。（5分）(3) 編寫完成類RectangleV2.java。（5分）3. 根據(jù)材料完成程序代碼（15分）。import java.util.Date;public class Account private int id; /賬號 private double balance; /賬戶余額 private Date createDate;/開戶日期 public Account(int id, double balance) this.id = id; this.balance = balance; this.createDate = new Date(); /取款方法 public void getMoney(double amt) /以下是3個訪問器方法 public int getId() return id; public double getBalance() return balance; public Date getCreateDate() return createDate; 根據(jù)以上給出的銀行賬戶類Account的定義，按要求完成以下代碼。說明：答卷上只填寫修改部分的代碼即可，原有代碼的其他部分不需要重寫。(1) 修改Account類的定義，使得Account類可以進(jìn)行序列化。（3分）(2) 修改并完成getMoney方法，要求：如果余額足夠，則減去參數(shù)amt給出的金額；否則getMoney方法拋出一個Exception異常對象，異常信息為“余額不足.”。（3分）(3) 修改Account類的定義，使得Account類可以進(jìn)行“深克隆”，說明：Date類可以進(jìn)行克隆。（4分）第 7 頁 共 8 頁