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）

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;
}

}

11.2

package 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();
}

}

11.3

import 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

}

11.4

import 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