文章目录
-
- 11.2
- 11.4
- 11.10
- 11.13
- 11.16
- 11.17
11.2
package wwr;
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", "[email protected]");
Student p2 = new Student("BBB", "bbb", "22222222222", "[email protected]", 2);
Employee p3 = new Employee("CCC", "ccc", "33333333333", "[email protected]", "C303", 7000.00, date);
Faculty p4 = new Faculty("DDD", "ddd", "44444444444", "[email protected]", "D404", 8000.00, date, "4 hours", "professor");
Staff p5 = new Staff("EEE", "eee", "55555555555", "[email protected]", "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
package wwr;
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
package wwr;
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();
MyStack stack=new MyStack();
stack.push(s1);
stack.push(s2);
stack.push(s3);
stack.push(s4);
stack.push(s5);
int leng=stack.getSize();
for(int i=0; i<leng; i++) {
System.out.println(stack.pop());
}
}
}
11.13
package wwr;
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
package wwr;
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
package wwr;
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);
}
}
