Java程序设计题目

Question

3. 设计一个抽象类Person和Learnmoney，Study两接口。该类包含name,sex,age变量和work抽象方法。然后在其子类Docotor,Teacher,Student中分别根据实际情况实现抽象方法work。Docotor,Teacher两个类实现Learnmoney接口；Student类实现Study接口。在main方法中分别创建Student， Teacher,两个类的对象，并通过构造方法为两个对象赋予初始值，然后通过对象名分别调用两个对象的name,sex,age的值和work方法，再调用Teacher类的learnmoney方法和Student类的study方法。
4. (1) 设计一个Rectangle类，添加属性width、height。
(2) 在Rectangle中添加两种方法计算矩形的周长和面积。
（3）编程利用Rectangle输出一个矩形的周长和面积。
5.定义接口A，接口内有两个方法：method1(int x) 和method2(int x,int y)，它们的返回值类型均为int。编写一个类，并使其实现接口A：令方法method1(int x)的功能是求5的x次方、方法method2(int x,int y)的功能是求两个参数的最大值。在paint()方法中调用这两个方法，显示method1(2)和method2(2，8)的结果。

求能正确运行的java代码

Answer 1

3， 文件名：Three.java
public class Three {

public static void main(String[] args) {
Student stu = new Student("Zhang San", true, (short)12);
System.out.println("Student name: " + stu.name);
System.out.println("Student is a male?: " + stu.sex);
System.out.println("Student's age: " + stu.age);
stu.work();
stu.study();

Teacher teacher = new Teacher();
teacher.learnMoney();
}

}

abstract class Person{//抽象类Person
protected String name;
protected boolean sex;
protected short age;

protected abstract void work(); //work抽象方法
}

interface Learnmoney{//Learnmoney接口
public void learnMoney();
}

interface Study{//Study接口
public void study();
}

class Student extends Person implements Study{//Student类

public void work() {
System.out.println("学生的工作是努力学习");
}

public Student(String name, boolean sex, short age){
super.name = name;
super.sex = sex;
super.age = age;
}

public void study() {
System.out.println("学生正在学习");
}

}

class Teacher extends Person implements Learnmoney{

public void work() {
System.out.println("教师的工作是教书育人");;
}

public void learnMoney() {
System.out.println("教师正在赚钱");
}

}
class Docotor extends Person implements Learnmoney{

public void work() {
System.out.println("医生的职责是救死扶伤");
}

public void learnMoney() {
System.out.println("医生正在赚钱");
}

}
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4文件名：Four.java
public class Four {

public static void main(String[] args) {
Rectangle r = new Rectangle(3, 4);
System.out.println("Area is : " + r.area());
System.out.println("Circle is: " + r.circle());
}
}

class Rectangle{
private double width;
private double height;

public Rectangle(double width, double height){
this.width = width;
this.height = height;
}

public double circle(){//求周长
return (width + height) * 2;
}

public double area(){//求面积
return width * height;
}
}

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5Five.java
public class Five {

public static void main(String[] args) {
AImpl a = new AImpl();
a.paint();
}

}

interface A {
public int method1(int x);
public int method2(int x, int y);
}

class AImpl implements A{

public int method1(int x) {
return (int)Math.pow(x, 5);
}

public int method2(int x, int y) {
return x > y? x: y;
}

public void paint(){
int result1 = method1(2);
int result2 = method2(2, 8);

System.out.println("method1(2) = " + result1);
System.out.println("method2(2, 8) = " + result2);
}

}

-----------------------------测试
method1(2) = 32
method2(2, 8) = 8

Answer 2

第一题
abstract class Person{
public String name;
public String sex;
public int age;
abstract void work();

}
interface Learnmoney{
void Learnmoney();
}
interface Study{
void study();
}
class Docotor extends Person implements Learnmoney{
void work() {
System.out.println("我是一个Docotor");

}
public void Learnmoney(){}
}
class Teacher extends Person implements Learnmoney{
String name="王老师";
String sex="女";
int age=30;
void work(){
System.out.println("我是一个teacher");
}

public void Learnmoney() {
System.out.println("同学们要交学费了");
}
}
class Student extends Person implements Study{
String name="李同学";
String sex="男";
int age=16;
void work(){
System.out.println("我是一个student");
}

public void study() {
System.out.println("我要好好学习");
}
}

public class stu {
stu(Teacher t,Student s) {
t = new Teacher();
s = new Student();
t.work();
System.out.println(t.name+"的性别是"+t.sex+",年龄是"+t.age );
t.Learnmoney();
s.work();
System.out.println(s.name+"的性别是"+s.sex+",年龄是"+s.age );
s.study();
}

public static void main(String[] args) {
Teacher t = null;
Student s = null;
stu st=new stu(t, s);
}
}
第二题
import java.util.Scanner;
public class Rectangle {
public static int width;
public static int height;
int length(int width,int height){
int l;
l=width*2+height*2;
return l;
}
int area(int width,int height){
int a;
a=width*height;
return a;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("请输入长：");
Scanner sc = new Scanner(System.in);
String l = sc.next();
width=Integer.parseInt(l);
System.out.println("请输入宽：");
String h = sc.next();
height=Integer.parseInt(h);
Rectangle r=new Rectangle();
int length=r.length(width,height);
int area = r.area(width,height);
System.out.print("你所输入的矩形的周长是："+length);
System.out.print("你所输入的矩形的面积是："+area);
}
}
第三题
interface A{
int method1(int x);
int method2(int x,int y);

}
public class B implements A {

public static void main(String[] args) {
B b=new B();
System.out.println(b.method1(2));
System.out.println(b.method2(2,8));
}
public int method1(int x) {
int z=(int) Math.pow(5, x);
return z;
}

public int method2(int x, int y) {
return Math.max(x, y);
}
}

Answer 3

第三题：
//抽象类Person
abstract class Person{
String name;
public String getName() {
return name;
}
public String getSex() {
return sex;
}
public int getAge() {
return age;
}
String sex;
int age;
public Person(String name,String sex,int age){
this.name=name;
this.sex=sex;
this.age=age;
}
public abstract void work();
}
//接口 Learnmoney
interface Learnmoney{
public void learnmoney();
}
//接口 Study
interface Study{
public void study();
}
//Teacher类
class Teacher extends Person implements Learnmoney{
public Teacher(String name, String sex, int age) {
super(name, sex, age);
}
public void work(){
System.out.println("我是老师，我工作是授课！");
}
public void learnmoney() {
System.out.println("我是老师，我工作是挣钱的！");
}
}
//类Docotor
class Docotor extends Person implements Learnmoney{
public Docotor(String name, String sex, int age) {
super(name, sex, age);
}

public void work(){
System.out.println("我是医生，我工作是治病！");
}

public void learnmoney() {
System.out.println("我是医生，我工作是挣钱的！");

}
}
//类Student
class Student extends Person implements Study{
public Student(String name, String sex, int age) {
super(name, sex, age);
}

public void work(){
System.out.println("我是学生，我工作是学习知识！");
}

public void study() {
System.out.println("我是学生，我主要是学习！");

}
}
//测试类
public class TestPerson {
public static void main(String []args){
//创建两个类对象
Student xiaoming=new Student("小明","男",18);
Teacher wang=new Teacher("王老师","男",29);

xiaoming.work();
xiaoming.study();

wang.work();
wang.learnmoney();
}
}

Answer 4

不想写了

Answer 5

问题其实很简单，只是量太多了