Question

大学java习题 ：定义一个汽车类car

急求！！！！属性包括：汽车品牌 颜色 和 速度（double）并且所有属性为私有。 至少提供一个有参的构造方法（要求品牌和颜色可以初始化为任意值，但速度的初始值必须为0）。 为私有属性提供访问器方法。注意： 汽车品牌一旦初始化之后不能修改。 定义测试类CarTest，在其main方法中创建一个品牌为“benz” 颜色为“black”的汽车

Answer 1

public class CarTest {
public static void main(String[] args) {
Car car =new Car("benz","black");
System.out.println(car);
}
}
public class Car {
public Car() {

}
public Car(String brand, String color) {
this.brand=brand;
this.color=color;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public String getBrand() {
return brand;
}
private String brand;
private String color;
private Double speed = 0.0;
@Override
public String toString() {
return "Car [brand=" + brand + ", color=" + color + ", speed=" + speed
+ "]";
}
}
public class Car {
public Car() {

}
public Car(String brand, String color) {
this.brand=brand;
this.color=color;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public String getBrand() {
return brand;
}
private String brand;
private String color;
private Double speed = 0.0;
@Override
public String toString() {
return "Car [brand=" + brand + ", color=" + color + ", speed=" + speed
+ "]";
}
}

Answer 2

package Help3;

public class Car {
	private String pingpai;
	private String color;
	private Double sudu;
	
	public Car(String pingpai, String color, Double sudu) {
		this.pingpai = pingpai;
		this.color = color;
		this.sudu = 0.0;
	}

	public void setPingpai(String pingpai) {
		this.pingpai = pingpai;
	}

	public void setColor(String color) {
		this.color = color;
	}

	public void setSudu(Double sudu) {
		this.sudu = sudu;
	}

	public String getPingpai() {
		return pingpai;
	}

	public String getColor() {
		return color;
	}

	public Double getSudu() {
		return sudu;
	}

	@Override
	public String toString() {
		return "Car [pingpai=" + pingpai + ", color=" + color + ", sudu="
				+ sudu + "]";
	}
}


package Help3;

public class CarTest {
	public static void main(String[] args) {
		Car car = new Car("benz", "black", 0.0);
		System.out.println(car.toString());
	}
}

Answer 3

public class Car {
	private String brand;
	private String color;
	private double speed;

	public Car(String _brand, String _color) {
		brand = _brand;
		color = _color;
		speed = 0;
	}
	
	public String getBrand(){
		return brand;
	}
	
	public String getColor(){
		return color;
	}
	
	public void setColor(String newcolor){
		color = newcolor;
	}
	
	public double getSpeed(){
		return speed;
	}
	
	public void setSpeed(double newspeed){
		speed = newspeed;
	}

}

public class CarTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Car myCar = new Car("Benz", "black");
		System.out.println(myCar.getBrand());
	}

}

注意class Car放到Car.java里，class CarTest放到CarTest.java里

Answer 4

//car类文件
Class Car{
private String brand;

private String color;
private double speed;
public Car(String brand,String color){
this.brand=brand;
this.color=color;
this.speed=0.0d;

}
public String getBrand(){
return this.brand;

}
public String getColor(){
return this.color;

}
public setColor(String color){
this.color=color;

}
public double getSpeed(){
return this.speed;

}
public setSpeed(double speed){
this.speed=speed;

}
}

//主类文件
Class CarTest{
public static void main(String[] args){
Car car=new Car("benz","black");

}

}
纯手打，可能有编译错误

Answer 5

public class Car {
private final String brand;
private final String color;
private Double speed;

Car (String brand , String color ) {
this.brand = brand;
this.color = color;
this.speed = 0d;
}

public static void main(String args[]){

}
}

public class TestCar {
public static void main(String args[]){
Car car = new Car("benz", "black");

}
}

按你的要求写的两个类