程序如下：
public class Car{
    String color;
    String category;
    
    Car(){
        color="红色";
        category="轿车";
    }
    
    Car(String color,String category){
        this.color=color;
        this.category=category;
    
    }
    
}

public class Car1 extends Car{
          String factory;
          
          Car1(String color,String category,String factory){
              super(color,category);
              this.factory=factory;
              
          }
          Car1(String color){
              this.color=color;
              category="轿车";
              factory="上海大众";
          }
          Car1(){
              Car1("蓝色");
          }
          
          public void display()
     {
           System.out.println(color+","+category+","+factory);
     }      
    
    public static void main(String args[]){
        Car1 c1=new Car1("红色","轿车","广州本田");
        Car1 c2=new Car1("黑色");
        Car1 c3=new Car1();
        
        c1.display();
        c2.display();
        c3.display();
    }
}

提示错误：Car1.java:16: 找不到符号
         符号： 方法 Car1(java.lang.String)
          位置： 类 Car1
            Car1("蓝色");

麻烦大家看下，我一直不知道哪出错了。