| Java语言程序设计与数据结构（基础篇）课后练习题 第十一章 （一） | 您所在的位置：网站首页 › java程序设计韩建平课后答案 › Java语言程序设计与数据结构（基础篇）课后练习题 第十一章 （一） |
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11.1
import java.util.Date; import java.util.Scanner; public class dishiyizhang { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("Enter three sides: "); double s1 = input.nextDouble(); double s2 = input.nextDouble(); double s3 = input.nextDouble(); System.out.println("Enter color: "); String str = input.next(); System.out.println("Enter filled: "); boolean filled = input.nextBoolean(); Triangle t = new Triangle(s1, s2, s3); t.setColor(str); t.setFilled(filled); System.out.println("The area:" + t.getArea()); System.out.println("The perimeter:" + t.getPerimeter()); System.out.println("The color:" + t.getColor()); System.out.println("The filled:" + t.isFilled()); }} class GeometricObject { private String color = "white"; private boolean filled; private Date dateCreated; public GeometricObject() { dateCreated = new Date(); } public GeometricObject(String color, boolean filled) { dateCreated = new Date(); this.color = color; this.filled = filled; } public String getColor() { return color; } public void setColor(String color) { this.color = color; } public boolean isFilled() { return filled; } public void setFilled(boolean filled) { this.filled = filled; } public Date getDateCreate() { return dateCreated; } public String toString() { return "created on " + dateCreated + "\ncolor: " + color + " and filled: " + filled; }} class Triangle extends GeometricObject { private double s1; private double s2; private double s3; public Triangle() { super(); this.s1 = this.s2 = this.s3 = 1; } public Triangle(double s1, double s2, double s3) { super(); this.s1 = s1; this.s2 = s2; this.s3 = s3; } public double getSide1() { return s1; } public double getSide2() { return s2; } public double getSide3() { return s3; } public double getArea() { double p = (s1 + s2 + s3) / 2; return Math.sqrt(p * (p - s1) * (p - s2) * (p - s3)); } public double getPerimeter() { return s1 + s2 + s3; } public String toString() { return "Triangle: side1 = " + s1 + " side2 = " + s2 + " side3 = " + s3; }} 11.2package dishiyizhang; public class dishiyizhang{ public static void main(String[] args) { Student s = new Student(Student.ONE,"老刘","上海","123456789","13456@email"); Employee e = new Employee("程序员",2300.0,"老张","北京","123456789","145662@email"); Faculty f = new Faculty("程序员2",2300.0,"time","grade","老李","北京","123456789","145662@email"); Staff sta = new Staff("程序员3",2300.0,"post","老周","北京","123456789","145662@email"); System.out.println(s.toString()); System.out.println(e.toString()); System.out.println(f.toString()); System.out.println(sta.toString()); }} class Person { private String name; private String address; private String number; private String Email; protected Person() { } protected Person(String name, String address, String number, String Email) { this.name = name; this.address = address; this.number = number; this.Email = Email; } protected String getName() { return name; } protected void setName(String name) { this.name = name; } protected String getAddress() { return address; } protected void setAddress(String address) { this.address = address; } protected String getNumber() { return number; } protected void setNumber(String number) { this.number = number; } protected String getEmail() { return Email; } protected void setEmail(String Email) { this.Email = Email; } @Override public String toString() { return "ObejectByPerson" + "Name:" + getName(); }} class Student extends Person { public final static String ONE = "Freshman"; public final static String TWO = "Sophomore"; public final static String THREE = "Junior"; public final static String FOUR = "Senior"; private String StudentState; public Student() { StudentState = ONE; } public Student(String StudentState, String name, String address, String number, String Email) { super(name, address, number, Email); this.StudentState = StudentState; } public String getStudentState() { return StudentState; } public void setStudentState(String StudentState) { this.StudentState = StudentState; } public String toStringOfAllInforation() { return "Student is inforation:Grade:" + getStudentState() + "\tName:" + getName() + "\tAddress:" + getAddress() + "\tNumber:" + getNumber() + "\tEmail:" + getEmail(); } @Override public String toString() { return "ObjectByStudent-->" + "Name:" + getName(); }} class Employee extends Person { private String Office; private double salary; protected Employee() { } protected Employee(String Office, double salary, String name, String address, String number, String Email) { super(name, address, number, Email); this.Office = Office; this.salary = salary; } protected String getOffice() { return Office; } protected void setOffice(String Office) { this.Office = Office; } protected double getSalary() { return salary; } protected void setSalary(double salary) { this.salary = salary; } @Override public String toString() { return "ObjectByEmployee-->" + "Name:" + getName(); }} class Faculty extends Employee { private String OfficeTime; private String PostGrade; public Faculty() { } public Faculty(String Office, double salary, String OfficeTime, String PostGrade, String name, String address, String number, String Email) { super(Office, salary, name, address, number, Email); this.OfficeTime = OfficeTime; this.PostGrade = PostGrade; } public String getOfficeTime() { return OfficeTime; } public void setOfficeTime(String OfficeTime) { this.OfficeTime = OfficeTime; } public String getPostGrade() { return PostGrade; } public void setPostGrade(String PostGrade) { this.PostGrade = PostGrade; } public String toStringOfAllInforation() { return "Faculty is inforation:PostGrade:" + getPostGrade() + "\tOfficeTime:" + getOfficeTime() + "\tSalary:" + getSalary() + "Office:" + getOffice() + "\tName:" + getName() + "\tAddress:" + getAddress() + "\tNumber:" + getNumber() + "\tEmail:" + getEmail(); } @Override public String toString() { return "ObjectByFaculty-->" + "Name:" + getName(); }} class Staff extends Employee { private String Post; public Staff() { } public Staff(String Office, double salary, String Post, String name, String address, String number, String Email) { super(Office, salary, name, address, number, Email); this.Post = Post; } public String getPost() { return Post; } public void setPost(String Post) { this.Post = Post; } public String toStringOfAllInforation() { return "Staff is inforation:Post:" + getPost() + "\tSalary:" + getSalary() + "Office:" + getOffice() + "\tName:" + getName() + "\tAddress:" + getAddress() + "\tNumber:" + getNumber() + "\tEmail:" + getEmail(); } @Override public String toString() { return "ObjectByStaff-->" + "Name:" + getName(); }} 11.3import java.util.Date; public class dishiyizhang { public static void main(String[] args) { Account a = new Account(1, 2000); CheckingAccount c = new CheckingAccount(114, 514, 1919); Saving_Account s = new Saving_Account(); System.out.println(a.toString() + "\n" + c.toString() + "\n" + s.toString()); }} class Account { private int id; private double balance; private double Rate; private Date dateCreated; public Account() { id = 0; balance = 0; Rate = 0; dateCreated = new Date(); } public Account(int i, double b) { id = i; balance = b; Rate = 0; dateCreated = new Date(); } public int getId() { return id; } public void setId(int j) { id = j; } public double getBalance() { return balance; } public void setBalance(double j) { balance = j; } public double getAnnualInterestRate() { return Rate; } public void setAnnualInterestRate(double j) { Rate = j; } public Date getDateCreated() { return dateCreated; } public double getMonthlyInterestRate() { return Rate / 12; } public double getMonthlyInterest() { return Rate / 12 * balance; } public void withDraw(double m) { balance -= m; } public void deposit(double m) { balance += m; }} class CheckingAccount extends Account { private double overDraw; public CheckingAccount() { super(); } public CheckingAccount(int i, double b, double o) { super(i, b); overDraw = o; }} class Saving_Account extends Account { //直接继承Account} 11.4import java.util.ArrayList; import java.util.Scanner; public class dishiyizhang { public static void main(String[] args) { System.out.print("Enter numbers (0 finished): "); Scanner input = new Scanner(System.in); ArrayList list = new ArrayList(); int n = input.nextInt(); while (n != 0) { list.add(n); n = input.nextInt(); } System.out.println("The maximum is " + max(list)); } public static Integer max(ArrayList list) { if (list == null || list.size() == 0) return null; else return java.util.Collections.max(list); }} 11.5清单10-6.，，，，，前面的课程清单都找不到。。。看题目挺简单的，就是换成ArrayList来存储。 11.6因为之前circle等的类都删除了，这里就写了一个Date对象，想要返回其他的再去看看前面课程吧。 import java.util.ArrayList; import java.util.Date; public class dishiyizhang { public static void main(String[] args) { ArrayList list = new ArrayList(); Date d = new Date(); list.add(d); for(Object o: list) System.out.println(o.toString()); }} 11.7import java.util.ArrayList; public class dishiyizhang { public static void main(String[] args) { ArrayList list = new ArrayList(); list.add(1); list.add(2); list.add(3); list.add(4); shuffle(list); System.out.println(list.toString()); } public static void shuffle(ArrayList list){ java.util.Collections.shuffle(list); }} 11.8import java.util.ArrayList; import java.util.Date; public class dishiyizhang { public static void main(String[] args) { Account a = new Account(1122, 1000, "George"); a.deposit(1000, "First deposit"); a.deposit(2000, "Second deposit"); a.deposit(3000, "Third deposit"); a.withDraw(1, "First withdraw"); a.withDraw(2, "Sceond withdraw"); a.withDraw(3, "Third withdraw"); System.out.print("name :" + a.getName() + " rate: " + a.getAnnualInterestRate() + " balance: " + a.getBalance() + "\n"); for (Transaction b : a.transactions) { System.out.println("date: " + b.date); System.out.println("type: " + b.type); System.out.println("amount: " + b.amount); System.out.println("new balance: " + b.balance); System.out.println("description: " + b.description); } }} class Account { private int id; private double balance; private double Rate; private Date dateCreated; private String name; ArrayList transactions; public Account() { id = 0; balance = 0; Rate = 0; dateCreated = new Date(); transactions = new ArrayList(); } public Account(int i, double b) { id = i; balance = b; Rate = 0; dateCreated = new Date(); transactions = new ArrayList(); } public Account(int i, double b, String n) { id = i; balance = b; Rate = 0; dateCreated = new Date(); name = n; transactions = new ArrayList(); } public int getId() { return id; } public void setId(int j) { id = j; } public double getBalance() { return balance; } public void setBalance(double j) { balance = j; } public double getAnnualInterestRate() { return Rate; } public void setAnnualInterestRate(double j) { Rate = j; } public Date getDateCreated() { return dateCreated; } public double getMonthlyInterestRate() { return Rate / 12; } public double getMonthlyInterest() { return Rate / 12 * balance; } public void withDraw(double m, String s) { balance -= m; transactions.add(new Transaction('W', m, balance, s)); } public void deposit(double m, String s) { balance += m; transactions.add(new Transaction('D', m, balance, s)); } public void setName(String n) { name = n; } public String getName() { return name; }} class Transaction { public Date date; public char type; public double amount; public double balance; public String description; public Transaction(char c, double a, double b, String d) { date = new Date(); type = c; amount = a; balance = b; description = d; }} 11.9import java.util.ArrayList; import java.util.Scanner; public class dishiyizhang { public static void main(String[] args) { System.out.print("Enter the array size n: "); Scanner input = new Scanner(System.in); int s = input.nextInt(); int[][] mt = new int[s][s]; ArrayList rows = new ArrayList(); ArrayList columns = new ArrayList(); for (int i = 0; i < s; i++) { for (int j = 0; j < s; j++) mt[i][j] = (int) (Math.random() * 2); } for (int i = 0; i < s; i++) { int sum = 0; for (int j = 0; j < s; j++) { if (mt[i][j] == 1) sum++; } rows.add(sum); } for (int j = 0; j < s; j++) { int sum = 0; for (int i = 0; i < s; i++) { if (mt[i][j] == 1) sum++; } columns.add(sum); } System.out.println("The random array is "); for (int i = 0; i < s; i++) { for (int j = 0; j < s; j++) { System.out.print(mt[i][j] + " "); } System.out.println(); } System.out.println("The largest row index: " +java.util.Collections.max(rows)); System.out.println("The largest column index: "+java.util.Collections.max(columns)); }} |
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