Java一个小程序。急救啊，在线等~~！

public class Car {
private String owner;
private String color;
private String name;
private int num;
public Car(){
}
public Car(String owner){
this.owner = owner;
}
public Car(String owner,String color,String name,int num){
this.owner = owner;
this.color = color;
this.name = name;
this.num = num;
}
public void toString(Car car){
System.out.println(car.owner+"
拥有"+car.num+"辆"+car.color+car.name);
}
}
//Show 类 用于初始化Car类，并输出相关信息
public class Show {
public static void main(String[] args) {
System.out.println("专科学校："+"高博"+"\n"+"我的准考证号"+"000000");
System.out.println("我的姓名："+"某某"+"\n"+"我的学号："+"000");
Car audi = new Car("顾珏","红色","奥迪",1);
audi.toString(audi);
Car benz = new Car ("顾珏","黑色","奔驰",2);
benz.toString(benz);
}
}

试验结果：
专科学校：高博
我的准考证号000000
我的姓名：某某
我的学号：000
顾珏拥有1辆红色奥迪
顾珏拥有2辆黑色奔驰

public class Car {

private String name;//车名
private String type;//型号
private double price;//价格

public Car(){}

public Car(String name,double price){
this.name=name;
this.price=price;
}
public Car(String name,String type,double price){
this.name=name;
this.type=type;
this.price=price;
}
public String toString() {
System.out.println("您的car信息是：");
return "车名为："+this.name+"\t"+"车型号为："+this.type+"\t"+"价格为："+this.price;
}
}
public class Show {

public static void main(String[] args) {
Car car1=new Car();
System.out.println(car1.toString());
Car car2=new Car("奔驰",1200000.0);
System.out.println(car2.toString());
Car car3=new Car("大众","ttt",120000000);
System.out.println(car3.toString());
}

}

public class Show {

/**
* @param args
*/
public static void main(String[] args) {
Car car1 = new Car("宝马",2,120000);
Car car2 = new Car("兰博基尼",5,270000);
System.out.println(car1.toString());
System.out.println(car2.toString());
}

}

class Car{
private String name;
private int number;
private int price;

public Car(){
/*如果要两个构造方法同时给属性付值并且输出,要把值放到Map或其它里面才行,不然只是new Car(String)
* 和new Car(int ,int)这样不能得到想要的值
*
*/
}

public Car(String name,int number,int price){
this.name = name;
this.number = number;
this.price = price;
}

public String toString(){
String backString="";
backString = "车辆名称:"+this.name+"\n"+"数量:"+this.number+"\n"+"价格: $"+this.number*this.price;
return backString;
}
}

//晕啊，最近答题，只显示一部分答案出来，百度，你把答案吃了啊
public class Show {
public static void main(String[] args){
Car car1 = new Car(

我记得回答过的。。怎么又出现～～～～