Java语言程序设计基础篇第十一章课后答案 |
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11.1 package hgh; 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(); } }11.2： package hgh; 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; } }11.4： package shap1;import java.util.ArrayList;import java.util.Scanner;public class class11_4 { public static void main(String[] args) { ArrayList list = new ArrayList(); Scanner sc = new Scanner(System.in); System.out.print("Enter integers (input ends with 0): "); int value; do{ value = sc.nextInt(); if(!list.contains(value)&&value!=0){ list.add(value); } }while(value!=0); System.out.println("The max Integer is : "+max(list)); } public static Integer max(ArrayList list){ if(list.size()==0){ return null; } int i=list.get(0); for (Integer integer : list) { i=i>integer?i:integer; } return i; } } 11.6 package hgh; import java.util.Scanner; import java.util.ArrayList; import java.util.Date; public class Main { public static void main(String[] args) { ArrayList obj = new ArrayList(); obj.add(new Date()); obj.add("this is a string"); for(Object tmp : obj){ System.out.println(tmp.toString()); } } }11.7 public class seven { public static void main(String[] args) { ArrayList list = new ArrayList(); Scanner input = new Scanner(System.in); while(true){ int num = input.nextInt(); if(num == 0) break;//输入0结束输入 else list.add(num); } shuffle(list); for(Integer jkl :list) { System.out.print(jkl + " "); }}public static void shuffle(ArrayList list) { Integer xiabiao = 0; //用来存取随机的下标 int temp = 0; //存取未换之前的值 Random rand = new Random(); for(int i = 0;i row_Max) row_Max = row; //存储行里面最多有几个1 //归零 row = 0; System.out.println(); } for(int i = 0;i < array.length;i++) { for(int j = 0;j < array[0].length;j++) { if(array[j][i] == 1) column++; //‘1’的列累加器 } if(column > column_Max) column_Max = column; //存储列里面最多有几个1 column = 0; } //遍历数组将最多1的行、列下标存到list1、list2里面 for(int i = 0;i < array.length;i++) { for(int j = 0;j < array[0].length;j++) { if(array[i][j] == 1) row++; if(array[j][i] == 1) column++; } if(row == row_Max) list1.add(i); if(column == column_Max) list2.add(i); row = 0; column = 0; } //打印list1，list2的结果 System.out.println("具有最多1的行为"); for(Integer a:list1) System.out.print(a + " "); System.out.println('\n'+"具有最多1的列为"); for(Integer b:list2) System.out.print(b + " ");} } 11.10 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(); } } |
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