class Car
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{
// 車輛屬性
private String brand; // 品牌
private double engineDisplacement;// 排氣量
private double speed;// 當(dāng)前速度
private boolean status;// 啟動狀態(tài)
private double maxSpeed;// 最大速度
public double getSpeed () {
return this.speed;
}
public Car(String brand, double engineDisplacement, double maxSpeed) {
this.brand = brand;
this.engineDisplacement = engineDisplacement;
this.maxSpeed = maxSpeed;
// 其他屬性也要有初始值，不然執(zhí)行出錯。
this.speed = 0;
this.status = false;
}
/** 啟動 */
public void start() {
this.status = true;
printNowStatus ();
}
/** 關(guān)閉（熄火） */
public void stop() {
// 只在速度為0時關(guān)閉（貌似樓上兩位沒仔細(xì)看題…）
if (this.speed == 0)
{
this.status = false;
}
printNowStatus ();
}
/** 加速 */
public void speedUp() {
// 只在啟動時可以加速
if (this.status)
{
this.speed = this.speed + 20;
if (this.speed this.maxSpeed)
{
this.speed = this.maxSpeed;
}
}
printNowStatus ();
}
/** 減速 */
public void slowDown() {
// 只在啟動時可以減速
if (this.status)
{
this.speed = this.speed - 10;
if (this.speed 0)
{
this.speed = 0;
}
}
printNowStatus ();
}
/** 狀態(tài)打印，在每次啟動，加減速，關(guān)閉時調(diào)用 */
private void printNowStatus () {
System.out.println("轎車【" + this.brand + "】現(xiàn)在的啟動狀態(tài)是：" + this.status + "速度是：" + this.speed +"。");
}
}
public class TestCar
{
public static void main(String[] args)
{
Car myCar = new Car ("紅旗", 2, 120);
//啟動
myCar.start();
// 循環(huán)加速到120
while (myCar.getSpeed() 120)
{
myCar.speedUp();
}
//循環(huán)減速
while (myCar.getSpeed() 0)
{
myCar.slowDown();
}
//關(guān)閉
myCar.stop();
}
}
/* 直接拿文本寫的，我用的電腦沒裝jdk，樓主自己到Java開發(fā)環(huán)境下調(diào)試，應(yīng)該沒什么問題… */
import java.lang.*;
class Car{
public void safe(){
System.out.println("an quan xi shu gao !");
}
}
class Benz extends Car{
public void safe(){
System.out.println("che hao !");
}
}
class Santana extends Car{
public void safe(){
System.out.println("che hen bu hao hao !");
}
}
public class Test{
public static void main(String[]args){
Car s = new Car();
s.safe();
Benz s1 = new Benz();
s1.safe();
Santana s2 = new Santana();
s2.safe();
Car s3 = new Benz();
s3.safe();
Car s4 = new Santana();
s4.safe();
}
}
這是一個 命名為Test.java
public class Car{
double price;
String name;
int id;
//3個重載的構(gòu)造方法(name)(id,name)(id,name,price)
public Car(String name){
this(789,name);
}
public Car(int id,String name){
this(id,name,100000);
}
protected Car(int id,String name,double price){
this.price = price;
this.name = name;
this.id = id;
}
//3個重載的普通方法drive(int) drive(String) drive(int ,String)
public void drive(int i){
System.out.println("i = " + i);
System.out.println(price + "\n" + name + "\n" + id);
}
protected String drive(String s){
return "s is: " + s;
}
int drive(int i,String s){
return 2007;
}
}
class Test{
public static void main(String[]args){
Car c1 = new Car(777,"Santana");
c1.drive(18);
}
}
這個命名為Car.java
希望有你要的!
public class Car {
private String color;//顏色
private int door;//車門數(shù)量
private float speed;//車速
public Car(){
this.color = "紅色";
this.door = 3;
this.speed = 110;
}
public Car(String color, int door, float speed) {
this.color = color;
this.door = door;
this.speed = speed;
}
public void start(){
//汽車啟動。輸出汽車已啟動，并輸出汽車的各個屬性
System.out.println("汽車已啟動，汽車顏色為"+color+",車門數(shù)為"+door+",車速為"+speed);
}
public void speedUp(float speed){
//加速
System.out.println("汽車加速到"+speed+"km/h");
}
public void shutDown(float speed){
//減速
System.out.println("汽車減速到"+speed+"km/h");
}
public void brake(){
//剎車
System.out.println("已剎車");
}
}
public class Test {
public static void main(String[] args){
Car car = new Car();
car.start();
car.speedUp(100);
car.shutDown(60);
car.brake();
Car car1 = new Car("白色",4,20.2F);
car1.start();
car1.speedUp(100);
car1.shutDown(60);
car1.brake();
}
}
運行結(jié)果
第一題:
Car.java
public?class?Car?{
public?String?num;
public?float?price;
public?Car(String?num,float?price){
this.num?=?num;
this.price=price;
System.out.println("車牌號為："+num+",價格為："+price);
}
}
測試類:
public?class?CarTest?{
public?static?void?main(String[]?args)?{
Car?car?=?new?Car("京P34E68",?100000.23f);
}
}
輸出為：車牌號為：京P34E68,價格為：100000.23
第二題：
Student.java
public?class?Student?{
private?String?num;
private?String?name;
private?int?age;
private?String?sex;
public?String?getNum()?{
return?num;
}
public?void?setNum(String?num)?{
this.num?=?num;
}
public?String?getName()?{
return?name;
}
public?void?setName(String?name)?{
this.name?=?name;
}
public?int?getAge()?{
return?age;
}
public?void?setAge(int?age)?{
this.age?=?age;
}
public?String?getSex()?{
return?sex;
}
public?void?setSex(String?sex)?{
this.sex?=?sex;
}
public?String?tell()?{
return?"Student?[num="?+?num?+?",?name="?+?name?+?",?age="?+?age+?",?sex="?+?sex?+?"]";
}
public?static?void?main(String[]?args)?{
Student?student?=?new?Student();
student.setAge(18);
student.setNum("001");
student.setName("COLD");
student.setSex("男");
System.out.println(student.tell());
}
}
輸出：Student [num=001, name=COLD, age=18, sex=男]
希望能幫到你，望采納
public?class?Car?{
private?int?num;//編號
private?String?name;//型號
private?double?price;//單價
/**
?*?無參構(gòu)造
?*/
public?Car(){
super();
}
/**
?*?有參構(gòu)造
?*?@param?num
?*?@param?name
?*?@param?price
?*/
public?Car(int?num,?String?name,?double?price)?{
super();
this.num?=?num;
this.name?=?name;
this.price?=?price;
}
public?int?getNum()?{
return?num;
}
public?void?setNum(int?num)?{
this.num?=?num;
}
public?String?getName()?{
return?name;
}
public?void?setName(String?name)?{
this.name?=?name;
}
public?double?getPrice()?{
return?price;
}
public?void?setPrice(double?price)?{
this.price?=?price;
}
public?String?inforShow()?{
return?"Car?[num="?+?num?+?",?name="?+?name?+?",?price="?+?price?+?"]";
}
}
public?class?PriCar?extends?Car{
private?int?PersonNum;//最大載客量
public?PriCar(int?personNum)?{
super();
PersonNum?=?personNum;
}
public?PriCar()?{
super();
}
public?int?getPersonNum()?{
return?PersonNum;
}
public?void?setPersonNum(int?personNum)?{
PersonNum?=?personNum;
}
@Override
public?String?inforShow()?{
return?"PriCar?[PersonNum="?+?PersonNum?+?"]";
}
}
public?class?VanCar?extends?Car?{
private?double?weight;//最大載重
public?VanCar(double?weight)?{
super();
this.weight?=?weight;
}
public?VanCar()?{
super();
}
@Override
public?String?inforShow()?{
return?"PriCar??[num="?+?super.getNum()?+?",?name="?+?super.getName()?+?",?price="?+?super.getPrice()?+",weight="?+?weight?+?"]";
}
}
測試類不想寫了??應(yīng)該可以自己寫出來了吧
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