java语言程序设计基础篇第十一章编程练习题

1package 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();    }}2package 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;    }}34package 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;    }}56package 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());        }    }}78910package 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();    }}