调用构造函数时收到错误

Question

当我在代码中进行扫描后到达此部分时，我收到此错误：

Project2_JoshuaLucas[，0,0,0x0，无效，布局=java.awt.FlowLayout，alignmentX=0.0，alignmentY=0.0，border=，flags=9，maximumSize=，minimumSize=，preferredSize=java.awt.Dimension[width=350，height=200]]

Project2_JoshuaLucas selection = new Project2_JoshuaLucas("", "", "", "", "", "", "", 0.00);

Object source = event.getSource();
if (source == cabin1)
{
  cabin1.setBackground(Color.darkGray);
  cabin2.setBackground(Color.gray);
  cabin3.setBackground(Color.gray);
  cabin4.setBackground(Color.gray);
  cabin5.setBackground(Color.gray);
  cabin6.setBackground(Color.gray);
  cabin7.setBackground(Color.gray);
  cabin8.setBackground(Color.gray);
  cabin9.setBackground(Color.gray);
  cabin10.setBackground(Color.gray);
  suite1.setBackground(Color.red);
  suite2.setBackground(Color.red);

  System.out.println("Your choice is Cabin 11-1, would you like to designate this as your room?");
  info1 = scan_in.nextLine();
  info1 = info1.toLowerCase();

 if ( info1.equals ("yes") || info1.equals ("y"))
{
   continues=true;   
   System.out.println("Please enter the number of people in your cabin (*Maximum number of people is 2*)");
   cabin_people = scan_in.nextInt();
   scan_in.nextLine();


   while(continues)
   {
     switch (cabin_people)
     {
     case 1:
       System.out.println("There is one passenger within the cabin. (You will pay an EXTRA 45% because of the empty passenger slot)");
       continues=false;
       onepassenger=true;
       break;
     case 2:
       System.out.println("There are two passenger within this cabin.");
       continues=false;
       twopassenger=true;
       break;
     default:
       System.out.println("Please try again. Remember, the maximum amount of passengers allowed is 2.");
       System.out.println("How many passengers are staying within this cabin?");
       cabin_people=scan_in.nextInt();
       scan_in.nextLine();
       continues=true;

 }//Closes the Switch
 }//Closes the while(continues) loop

 while(onepassenger)
 {
   System.out.println("Please state your FIRST name: ");
   fname1=scan_in.nextLine();
   System.out.println();
   System.out.println("Please state your LAST name: ");
   lname1=scan_in.nextLine();

   onepassenger=false;
   Project2_JoshuaLucas passenger1 = new Project2_JoshuaLucas (fname1, lname1, "", "", "", "", "", 0.00);
   System.out.println(passenger1);
 } //Closes while(1passenger)

我该怎么解决这个问题？

Answer 1

java中的每个类都扩展了对象类：

public class Example{ //extends the default class Object

}

>

其中之一是toString（）方法

当您通过调用toString（）创建一个类时，实际上是在使用Object class中的方法，默认情况下，该方法返回一个表示类本身的字符串。

• 方式1）

如果要更改toString（）以返回所需内容，则必须@Override[Override]它。java就是这样做的。所以：

    public class Example{

        @Override
        public String toString(){

         return "I am naughty";

       }

     }

>

或者，您可以向类中添加自己的方法：

 public class Example{


   public String  getName(){

     return name;
   }


   public  String getLastName(){

     return lastName;

  }
 }

Answer 2

您的toString（）方法正在打印对象数据中的所有内容。