java语言程序设计基础篇第十一章编程练习题

1

package yongheng;
import java.util.Scanner;

public class Main {
public static void main(String agrs[]){
Triangle test = new Triangle();
System.out.println(test.toString());
}
}

class SimpleGeometricObject{
private String color = "white";
private boolean filled;
private java.util.Date dateCreated;

public SimpleGeometricObject(){
dateCreated = new java.util.Date();
}

public SimpleGeometricObject(String color, boolean filled){
dateCreated = new java.util.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 java.util.Date getDateCreated(){
return dateCreated;
}

public String toString(){
return "created on " + dateCreated + "\ncolor: " + color + " and filled: " + filled;
}
}

class Triangle extends SimpleGeometricObject{
private double side1 = 1.0;
private double side2 = 1.0;
private double side3 = 1.0;

public Triangle(){
super();
side1 = side2 = side3 = 1.0;
}

public Triangle(double side1, double side2, double side3){
super();
this.side1 = side1;
this.side2 = side2;
this.side3 = side3;
}

public double getSide1(){
return side1;
}

public double getSide2(){
return side2;
}

public double getSide3(){
return side3;
}

public double getArea(){
double p = (side1 + side2+ side3) / 2;
return Math.sqrt(p * (p-side1) * (p-side2) * (p-side3));
}

public double getPerimeter(){
return side1 + side2 + side3;
}

@Override
public String toString(){
return "created on " + super.getDateCreated() + "\ncolor: " + super.getColor() + "\nfilled: " + super.isFilled()
+ "\nArea: " + this.getArea() + "\nPerimeter: " + this.getPerimeter();
}
}

2

package yongheng;
import java.util.Scanner;

public class Main {
public static void main(String agrs[]){
Staff staff = new Staff();
System.out.println(staff.toString());
}
}

class Person{
protected String name;
private double height;
private double weight;
private String sex;

public Person(){
name = "default";
height = weight = 0;
sex = "female";
}

public Person(String name, double height, double weight, String sex){
this.name = name;
this.height = height;
this.weight = weight;
this.sex = sex;
}

public String getName(){
return name;
}

public void setName(String name){
this.name = name;
}

public String getSex(){
return sex;
}

public void setSex(String sex){
this.sex = sex;
}

public double getHeight(){
return height;
}

public void setHeight(double height){
this.height = height;
}

public double getWeight(){
return weight;
}

public void setWeight(double weight){
this.weight = weight;
}

public String toString(){
return "Name: " + name + "\nSex: " + sex + "\nHeight: " + height + "\nWeight: " + weight;
}
}

class Student extends Person{
public static int ONE = 1;
public static int TWO = 2;
public static int THREE = 3;
public static int FOUR = 4;

private int grade = 0;

public Student(){
super();
grade = 0;
}

public Student(String name, double height, double weight, String sex, int grade){
super(name,height,weight,sex);
this.grade = grade;
}

public int getGrade(){
return grade;
}

public void setGrade(int grade){
this.grade = grade;
}

@Override
public String toString(){
return super.toString() + "\nGrade: " + grade;
}
}

class Employee extends Person{
private String address;
private int tel;
private String email;

public Employee(){
super();
address = "default";
tel = 0;
email = "default";
}

public Employee(String name,double height, double weight, String sex,
String address, int tel, String email){
super(name,height,weight,sex);
this.address = address;
this.tel = tel;
this.email = email;
}

public String getAddress(){
return address;
}

public void setAddress(String address){
this.address = address;
}

public int getTel(){
return tel;
}

public void setTel(int tel){
this.tel = tel;
}

public String getEmail(){
return email;
}

public void setEmail(String email){
this.email = email;
}

@Override
public String toString(){
return super.toString() + "\nAddreaa: " + address +
"\nTel: " + tel + "\nEmail: " + email;
}
}

class Faculty extends Employee{
private double salary;
private String office;
private String startTime;
private String endTime;
private int grade;
private int workTime;

public Faculty(){
super();
salary = 0;
office = "default";
startTime = "timeless";
endTime = "timeless";
grade = 0;
workTime = 0;
}

public Faculty(String name,double height, double weight, String sex,
String address, int tel, String email, double salary, String office,
String startTime, String endTime, int grade, int workTime){
super(name,height,weight,sex,address,tel,email);
this.salary = salary;
this.office = office;
this.startTime = startTime;
this.endTime = endTime;
this.grade = grade;
this.workTime = workTime;
}

public double getSalary(){
return salary;
}

public void setSalary(int salary){
this.salary = salary;
}

public String getOffice(){
return office;
}

public void setOffice(String office){
this.office = office;
}

public String getTime(){
return startTime + "-" + endTime;
}

public void setTime(String startTime, String endTime){
this.startTime = startTime;
this.endTime = endTime;
}

public int getGrade(){
return grade;
}

public void setGrade(int grade){
this.grade = grade;
}

public int getWorkTime(){
return workTime;
}

public void setWorkTime(int workTime){
this.workTime = workTime;
}

@Override
public String toString(){
return super.toString() + "\nSalary: " + salary + "\nOffice: " + office +
"\nTime: " + startTime + "-" + endTime + "\nGrade: " + grade + "\nWorkTime: " + workTime;
}

}

class Staff extends Employee{
private double salary;
private String office;
private String startTime;
private String endTime;
private String duty;

public Staff(){
super();
salary = 0;
office = "default";
startTime = "timeless";
endTime = "timeless";
duty = "default";
}

public Staff(String name,double height, double weight, String sex,
String address, int tel, String email, double salary, String office,
String startTime, String endTime, String duty){
super(name,height,weight,sex,address,tel,email);
this.salary = salary;
this.office = office;
this.startTime = startTime;
this.endTime = endTime;
this.duty = duty;
}

public double getSalary(){
return salary;
}

public void setSalary(int salary){
this.salary = salary;
}

public String getOffice(){
return office;
}

public void setOffice(String office){
this.office = office;
}

public String getTime(){
return startTime + "-" + endTime;
}

public void setTime(String startTime, String endTime){
this.startTime = startTime;
this.endTime = endTime;
}

public String getDuty(){
return duty;
}

public void setDuty(String duty){
this.duty = duty;
}

@Override
public String toString(){
return super.toString() + "\nSalary: " + salary + "\nOffice: " + office +
"\nTime: " + startTime + "-" + endTime + "\nDuty: " + duty;
}
}

3
4

package yongheng;
import java.util.Scanner;
import java.util.ArrayList;

public class Main{

public static void main(String args[]){
ArrayList<Integer> num = new ArrayList<>();
Scanner cin = new Scanner(System.in);
int n = cin.nextInt();
for(int i = 0; i < n; ++i){
num.add(cin.nextInt());
}
int res = max(num);
System.out.println(res);
}

public static Integer max(ArrayList<Integer> list){

if(list.size() == 0 || list == null){
return 0;
}

int ret = list.get(0);
for(int i = 1; i < list.size(); ++i)
if(list.get(i) > ret)
ret = list.get(i);
return ret;
}
}

5
6

package yongheng;

import java.util.Scanner;
import java.util.ArrayList;
import java.util.Date;

public class Main {

public static void main(String[] args) {
ArrayList<Object> obj = new ArrayList<>();
obj.add(new Date());
obj.add("this is a string");
for(Object tmp : obj){
System.out.println(tmp.toString());
}
}

}

7
8
9
10

package yongheng;

import java.util.Scanner;
import java.util.ArrayList;

public class Main {

public static void main(String[] args) {
MyStack stack = new MyStack();
stack.push(5);
stack.push(10);
System.out.println(stack.toString() + "\n" + stack.pop() + " " + stack.pop() + "\n" + stack.toString());
}

}

class MyStack extends ArrayList{

@Override
public boolean isEmpty(){
return super.isEmpty();
}

public int getSize(){
return super.size();
}

public Object peek(){
return super.get(super.size()-1);
}

public Object pop(){
Object o = super.get(super.size()-1);
super.remove(super.size()-1);
return o;
}

public void push(Object o){
super.add(o);
}

@Override
public String toString(){
return "stack: " + super.toString();
}
}