Java

 public void readFromFile(FileIO fio) thows Exception{
      if(fio.hasNextInt()==false){
	    throw new Exception("Dealer.readFromFile:missing ncars");
	  }
       int ncars = fio.getNextInt();
       carArray = new Car[ncars];
       for(int i=0;i<carArray.length;i++){
        if(fio.getNextLine()==false){
	      throw new Exception("Dealer.readFromFile:missing ncars");
	    }
        String cartype=fio.getNextLine();
        if(cartype.equals("f")){
          carArray[i]= new Ford();
        }else{
          carArray[i]= new Honda();
        }
        carArray[i].readFromFile(fio);
      }//for each car in carrArray
      
     }//readFromFile
	 
	 You may assume that class fileioPkg.FileIO is part of your project:
     package fileioPkg;
     import java.util.*;
     import java.io.*;
     public class FileIO {
	//this class acts as a static "producer" class that,after being
	//initialized with a filename,
	private FileReader freader;
	private Scanner scan=null;
	public FileIO(){
		freader=null;
		scan=null;
	}//default const
	public FileIO(String filename) throws FileNotFoundException{

		File infile;

		FileReader reader;		
		infile = new File(filename);

		reader = new FileReader(infile);
		scan = new Scanner(reader);
	}//(String) constructor
	public boolean hasNextInt() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			return scan.hasNextInt();
		}
	}//hasNextInt
	public int getNextInt() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			int iv=scan.nextInt();
			System.out.println("FileIO.getNextInt:"+iv);
			return iv;
		}
	}//getNextInt
	
	public boolean hasNextLine() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			return scan.hasNextLine();
		}
	}//hasNextLine
	public String getNextLine() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			String result=scan.nextLine().trim();
			System.out.println("FileIO.getNextLine:"+result);
			return result;
		}
	}//getNextLine

	
	public boolean hasNextDouble() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			return scan.hasNextDouble();
		}
	}//hasNextDouble
	public double getNextDouble() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			double dv=scan.nextDouble();
			System.out.println("FileIO.getNextDouble:"+dv);
			return dv;
		}
	}//getNextDouble
	public void close(){
		try {
			freader.close();
		} catch (IOException e) {
			//ignore
		}
	}//close

}//class FileIO

class LayerPane extends JComponent
  { 
 	void LayerPane(int x1,int y1,int x2,int y2,int x3,int y3,int x4,int y4,int recW,int recH)
  	{
  		JLayeredPane lp = new JLayeredPane();
	        f.setLayeredPane(lp);
         	GridLayout grid = new GridLayout(1600, 1440,recW,recH);
         	lp.setLayout(grid);
		lp.setBounds(x1-5, y1-30, recW, recH);
		lp.setLocation(x1-5,y1-30);
		lp.setOpaque(true);
		Color color = new Color(0, 0, 0, 0.4F);
		lp.setBackground(color);
		MyListenerLP myListener2 = new MyListenerLP();
		lp.addMouseListener(myListener2);
		lp.setVisible(true);
 	} 
 		
    public void paintComponent(Graphics g)
    {
            g.setColor(Color.blue);
            g.drawLine(x,y,x+50,y+50);
        	System.out.print("\nx,y is = "+x); // not execute, why?
      		System.out.print(", "+y);
    }
	class MyListenerLP extends MouseInputAdapter
 	{
    	public void mouseClicked(MouseEvent e)
    	{
        	int x = e.getX();
      		int y = e.getY();
      		System.out.print("\nX,Y  = "+x); // execute
      		System.out.print(", "+y);
     		repaint(x,y,x,y);
    	}
 	}
  }