【java】第11章继承和多态测试题（作业部分）

旧城等待， 2022-10-21 14:53 179阅读 0赞

### 文章目录 ###

*   *  11.2
     *  11.4
     *  11.10
     *  11.13
     *  11.16
     *  11.17

## 11.2 ##

![在这里插入图片描述][20210505161352790.png]

package wwr;
    //11.2 参考https://blog.csdn.net/superyzh/article/details/46607851?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-7.vipsorttest&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-7.vipsorttest
    import java.util.Scanner;
    class MyDate {
        
    	
    	private String year;
    	private String month;
    	private String day;
    	public MyDate(String year, String month, String day) {
        
    		this.year = year;
    		this.month = month;
    		this.day = day;
    	}
    	public String getDate() {
        
    		return year + '.' + month + '.' + day;
    	}
    }
    
    class Person {
        
    	
    	private String name;
    	private String address;
    	private String tel;
    	private String email;
    	public Person (String name, String address, String tel, String email){
        
    		this.name = name;
    		this.address = address;
    		this.tel = tel;
    		this.email = email;
    	}
    	public String toString() {
        
    		return "name: " + name + "\taddress: " + address + "\ttel: " + tel + "\temail: " + email; 
    	}
    }
    
    class Student extends Person {
        
    	
    	private int grade;
    	public Student (String name, String address, String tel, String email, int grade) {
        
    		super(name, address, tel, email);
    		this.grade = grade;
    	}
    	public String toString() {
        
    		return super.toString() + "\tgrade: " + grade;
    	}
    }
    
    class Employee extends Person {
        
    	
    	String office;
    	double salary;
    	MyDate date;
    	public Employee(String name, String address, String tel, String email,
    			String office, double salary, MyDate date) {
        
    		super(name, address, tel, email);
    		this.office = office;
    		this.salary = salary;
    		this.date = date;
    	}
    	public String toString() {
        
    		return super.toString() + "\toffice: " + office + "\tsalary: " + salary + "\tdate: " + date.getDate(); 
    	}
    }
    
    class Faculty extends Employee {
        
    	
    	String worktime;
    	String level;
    	public Faculty(String name, String address, String tel, String email,
    			String office, double salary, MyDate date, String worktime, String level) {
        
    		super(name, address, tel, email, office, salary, date);
    		this.worktime = worktime;
    		this.level = level;
    	}
    	public String toString() {
        
    		return super.toString() + "\tworktime: " + worktime + "\tlevel: " + level; 
    	}
    }
    
    class Staff extends Employee {
        
    	
    	String title;
    	public Staff(String name, String address, String tel, String email,
    			String office, double salary, MyDate date,String title) {
        
    		super(name, address, tel, email, office, salary, date);
    		this.title = title;
    	}
    	public String toString() {
        
    		return super.toString() + "\ttitle: " + title;
    	}
    }
    
    public class Demo {
        
    	
    	public static void main(String[] args) {
        
    		Scanner input = new Scanner(System.in);
    		MyDate date = new MyDate("2021", "5", "8");
    		Person p1 = new Person("AAA", "aaa", "11111111111", "111111@qq.com");
    		Student p2 = new Student("BBB", "bbb", "22222222222", "222222@qq.com", 2);
    		Employee p3 = new Employee("CCC", "ccc", "33333333333", "333333@qq.com", "C303", 7000.00, date);
    		Faculty p4 = new Faculty("DDD", "ddd", "44444444444", "444444@qq.com", "D404", 8000.00, date, "4 hours", "professor");
    		Staff p5 = new Staff("EEE", "eee", "55555555555", "555555@qq.com", "E505", 9000.00, date, "director");
    		System.out.println(p1.toString());
    		System.out.println(p2.toString());
    		System.out.println(p3.toString());
    		System.out.println(p4.toString());
    		System.out.println(p5.toString());
    		
    	}
    }

## 11.4 ##

![在这里插入图片描述][2021050516141273.png]

package wwr;
    //11.4 参考https://blog.csdn.net/jxh1025_/article/details/109304393
    import java.util.ArrayList;
    import java.util.Scanner;
    
    public class Demo {
        
        public static void main(String[] args) {
        
            ArrayList<Integer> num = new ArrayList<>();
            Scanner input = new Scanner(System.in);
            System.out.print("Enter numbers end with 0: ");
            int number = input.nextInt();
            while (number != 0){
        
                num.add(number);
                number = input.nextInt();
            }
            int res = max(num);
            System.out.println("The max number is " + 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;
        }
    }

## 11.10 ##

![在这里插入图片描述][202105051614270.png]

package wwr;
    //11.10 参考https://blog.csdn.net/cxj18867076391/article/details/105587824/?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-2&spm=1001.2101.3001.4242
    import java.util.Scanner;
    import java.util.ArrayList;
    class MyStack extends ArrayList{
        
    	
    	private ArrayList<Object> list=new ArrayList<>();
    	public boolean isEmpty() {
        
    		return list.isEmpty();
    	}
    	public int getSize() {
        
    		return list.size();
    	}
    	public Object peek() {
        
    		return list.get(getSize()-1);
    	}
    	public Object pop() {
        
    		Object o=list.get(getSize()-1);
    		list.remove(getSize()-1);
    		return o;
    	}
    	public void push(Object o) {
        
    		list.add(o);
    	}
    	@Override
    	public String toString() {
        
    		return "stack: " + list.toString();	
    	}
    }
    
    public class Demo {
        
     
    	public static void main(String[] args) {
        
    		Scanner input=new Scanner(System.in);
    		System.out.println("Enter 5 Strings: ");
    		String s1=input.nextLine();
    		String s2=input.nextLine();
    		String s3=input.nextLine();
    		String s4=input.nextLine();
    		String s5=input.nextLine();
    		input.close();
    		//创建一个栈类
    		MyStack stack=new MyStack();
    		//入栈
    		stack.push(s1);
    		stack.push(s2);
    		stack.push(s3);
    		stack.push(s4);
    		stack.push(s5);
    		//逆序输出
    		int leng=stack.getSize();
    		for(int i=0; i<leng; i++) {
        
    			System.out.println(stack.pop());
    		}
    	}
    }

## 11.13 ##

![在这里插入图片描述][20210505161444282.png]

package wwr;
    //11.13 参考https://blog.csdn.net/cxj18867076391/article/details/105587824/?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-2&spm=1001.2101.3001.4242
    import java.util.ArrayList;
    import java.util.Scanner;
    public class Demo {
         
    	public static void removeDuplicate(ArrayList<Integer> list) {
              
    		ArrayList<Integer> newList = new ArrayList<>();
    		for(int i = 0; i < list.size(); i++) {
           
    			if( !newList.contains(list.get(i)) ) {
           
    				newList.add(list.get(i));
    			}
    		}
    		System.out.print("The distinct integers are ");
    		for(int i = 0; i < newList.size(); i++) {
        
    			System.out.print(newList.get(i) + " ");
    		}
    	}
    	public static void main(String[] args) {
        
    		Scanner input = new Scanner(System.in);
    		ArrayList<Integer> list = new ArrayList<>();
    		System.out.print("Enter ten integers: ");
    		int n1 = input.nextInt();
    		int n2 = input.nextInt();
    		int n3 = input.nextInt();
    		int n4 = input.nextInt();
    		int n5 = input.nextInt();
    		int n6 = input.nextInt();
    		int n7 = input.nextInt();
    		int n8 = input.nextInt();
    		int n9 = input.nextInt();
    		int n10 = input.nextInt();
    		input.close(); 
    		list.add(n1);
    		list.add(n2);
    		list.add(n3);
    		list.add(n4);
    		list.add(n5);
    		list.add(n6);
    		list.add(n7);
    		list.add(n8);
    		list.add(n9);
    		list.add(n10);
    		removeDuplicate(list);
    	}
    }

## 11.16 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1ODc4Mjky_size_16_color_FFFFFF_t_70]

package wwr;
    //11.16 参考https://blog.csdn.net/cxj18867076391/article/details/105587824/?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-2&spm=1001.2101.3001.4242
    import java.util.ArrayList;
    import java.util.Scanner;
    public class Demo {
        
     
    	public static void main(String[] args) {
        
    		Scanner input = new Scanner(System.in);
    		int number1 = (int) (Math.random() * 10);
    		int number2 = (int) (Math.random() * 10);
    		ArrayList<Integer> list = new ArrayList<>();
    		System.out.print("What is " + number1 + " + " + number2 + "? ");  
    		int answer = input.nextInt();
    		while(number1 + number2 != answer) {
        
    			if(!list.contains(answer)) {
        
    				list.add(answer);
    			}
    			else {
        
    				System.out.println("You already entered " + answer);
    			}
    			System.out.print("Wrong answer. Try again. What is " 
    					+ number1 + " + " + number2 + "? ");
    			answer = input.nextInt();
    		}		
    		System.out.println("You got it! ");
    	}
    }

## 11.17 ##

![在这里插入图片描述][20210505161539154.png]

package wwr;
    //11.17
    import java.util.Scanner;
    public class Demo {
        
    	
    	public static void main(String[] args) {
        
    		
    		Scanner input = new Scanner(System.in);
    		System.out.print("Enter an integer m: ");
    		int m = input.nextInt();
    		int n = m;
    		int[] a = new int[m * m + 2];
    		for(int i = 1;  i <= m * m; i++) {
        
    			a[i] = 0;
    		}
    		for(int i = 1;  i * i <= m * m; i++) {
        
    			a[i * i] = 1;
    		}
    		for(int i = 1; i <= m * m; i++) {
        
    			if(a[i * m] == 1) {
        
    				n = i;
    				break;
    			}
    		}
    		System.out.print("The smallest n makes m * n a perfect square is " + n);
    	}
    }

[20210505161352790.png]: /images/20221021/cb60f2e9c9a84903ae6b55d0bc525429.png
[2021050516141273.png]: /images/20221021/a7ecf8e252494430bb78453db911e20a.png
[202105051614270.png]: /images/20221021/29843ae015854057ac7efded408e8f8c.png
[20210505161444282.png]: /images/20221021/e012626acde9441ba8a799c951ae93e3.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1ODc4Mjky_size_16_color_FFFFFF_t_70]: /images/20221021/a6c7a40253af49d3aeeaefc5bf346547.png
[20210505161539154.png]: /images/20221021/b153c5d6de354b38b43b46889d814edc.png