questions on my java/swing gui

xviddivxoggmp3 · 07-11-2004, 01:48 PM

below is my code
I'm using gridbaglayout.
the layout has created extra space from the outside borders of the gui.
Does anyone know in what direction i should study to eliminate this?
I'm also having problems on my file processing.
if there are any pointers, i would be very grateful.

Code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;

public class homeworkJava extends JFrame 
{ 
   Container container= getContentPane();
   GridBagLayout layout= new GridBagLayout();
   GridBagConstraints c = new GridBagConstraints(); 

   Box box1 = Box.createVerticalBox();
   Box box2 = Box.createVerticalBox();
   Box box3 = Box.createVerticalBox();
           
   JTextField commands = new JTextField(18);

   JLabel GeneraLabel = new JLabel("Genera", JLabel.RIGHT);
   JLabel RatingLabel = new JLabel("Rating", JLabel.RIGHT);
   JLabel outputArea1Label = new JLabel("Details",JLabel.RIGHT);  

   JMenuBar bar = new JMenuBar();

   JMenu fileMenu = new JMenu("File");
   JMenu editMenu = new JMenu("Edit");

   Vector DetailsV = new Vector();
   Vector GeneraV = new Vector();
   Vector RatingV = new Vector();
   Vector TableLabelsV = new Vector();

   JComboBox GeneraCB = new JComboBox(GeneraV);
   JComboBox RatingCB = new JComboBox(RatingV);

   
   JTable jt = new JTable(DetailsV,TableLabelsV);
   //JScrollPane jsp = new JScrollPane(jt);

   File GeneraInputFile = new File("/home/buddha/code/homeworkJava","GeneraFile.txt");

   public homeworkJava()
   {
      super("DVD Database");

      container.setLayout(layout);    

      readData(GeneraInputFile,GeneraV);    

      commands.setText("COMMANDS");        

      GeneraLabel.setLabelFor(GeneraCB);
 
      RatingLabel.setLabelFor(RatingCB);     
  
      outputArea1Label.setLabelFor(jt);

      box1.add(GeneraLabel);
      box1.add(GeneraCB);

      box2.add(RatingLabel);
      box2.add(RatingCB);

      box3.add(outputArea1Label);
      box3.add(jt);   

      fileMenu.add(new JMenuItem("Open"));
      fileMenu.add(new JMenuItem("Close"));
      fileMenu.add(new JMenuItem("Search"));

      editMenu.add(new JMenuItem("Cut"));
      editMenu.add(new JMenuItem("Copy"));
      editMenu.add(new JMenuItem("Paste"));

      bar.add(fileMenu);
      bar.add(editMenu);
      
      TableLabelsV.add("Genera");
      TableLabelsV.add("Rating");
      TableLabelsV.add("Title");
      TableLabelsV.add("Discription");

      container.add(bar);

      box1.setBackground(Color.white);
      box2.setBackground(Color.white);
      box3.setBackground(Color.white);
      
      container.setBackground(Color.white);  
      
      c.fill = GridBagConstraints.BOTH;
      c.gridx = 0;
      c.gridy = 1;
      c.gridwidth=4;
      container.add(commands,c);    

      c.fill = GridBagConstraints.BOTH;
      c.gridx=0;
      c.gridy=2;
      c.gridwidth=2;
      container.add(box1,c);
      
      c.fill = GridBagConstraints.BOTH;
      c.gridx=1;
      c.gridy=2;
      c.gridwidth=0;
      container.add(box2,c);       
      
      c.fill = GridBagConstraints.BOTH;
      c.gridx=0;
      c.gridy=4;
      c.gridheight=9;
      c.gridwidth=3;
      container.add(box3,c);

      setSize(250,250);
      setVisible(true); 
   } 

   public static void main(String args[])
   {
      homeworkJava application = new homeworkJava();
      application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }

   public void readData(File inputFile,Vector DataStorage)
   {/////////////////work on this option 
     /* try
      {
        FileReader fr = new FileReader(inputFile);
        BufferedReader in = new BufferedReader(fr);
        while(in.readLine()!=null)
        {
          DataStorage.add(in.readLine());
        }
      }
      catch(FileNotFoundException e)
      {
        System.out.println("File Disappeared");
      }*/
   }
}

p-static · 07-11-2004, 07:45 PM

Well, if you don't know about it already, http://java.sun.com/j2se/1.4.2/docs/api/index.html is the entire java API, and it's an incredibly useful resource. To answer your question, i'd look at c.insets. (A full description is somewhere in the above link.) As for the file processing, it would help if you'd say what sort of problems you're having.

xviddivxoggmp3 · 07-12-2004, 12:50 PM

i have been unable to impliment the insets.

i have tried the following

Code:

container.getInsets(new Insets(0,0,0,0));

//and

container.Insets(0,0,0,0);

//and
Insets I = new Insets(0,0,0,0);
container.getInsets();

//and
Insets I = new Insets(0,0,0,0);
container.add(I);

Unfortunately there is no example code in any of my books or at that website you provided.
Good website by the way.
Do you have an example of it's implimentation?

Komakino · 07-12-2004, 05:16 PM

Yes, what are the problems with the file IO?
By the way,

Code:

FileReader fr = new FileReader(inputFile);
BufferedReader in = new BufferedReader(fr);

can be more neatly written as:

Code:

BufferedReader in = new BufferedReader(new FileReader(inputFile));

if you're not planning on needing to access the FileReader explicitly.

aaa · 07-13-2004, 07:42 AM

Use GridBagConstraints.insets (c.insets = new Insets(...)).
Use JFrame.setJMenuBar so the bar will always be at the top.
Set the size of your window to get rid of the extra space. GridBagLayout will not stretch itself to fit larger windows.

xviddivxoggmp3 · 07-18-2004, 09:29 PM

I'm writing a program that is to read a file into a vector after being tokenized.
I'm receiving an error that I'm not sure how to correct.

unreported exception java.ioIOException; must be caught or declared to be thrown
while((tokens = new StringTokenizer(in.readLine()))!=null))

I'm assuming that the while condition is invalid.
Why is that?
The code for my read is in the function on the very bottom of the program.
Code is below.

Code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;

public class homeworkJava extends JFrame 
{ 
   Container container= getContentPane();
   GridBagLayout layout= new GridBagLayout();
   GridBagConstraints c = new GridBagConstraints(); 

   Box box1 = Box.createVerticalBox();
   Box box2 = Box.createVerticalBox();
   Box box3 = Box.createVerticalBox();
           
   JTextField commands = new JTextField(18);

   JLabel GeneraLabel = new JLabel("Genera", JLabel.RIGHT);
   JLabel RatingLabel = new JLabel("Rating", JLabel.RIGHT);
   JLabel outputArea1Label = new JLabel("Details",JLabel.RIGHT);  

   JMenuBar bar = new JMenuBar();

   JMenu fileMenu = new JMenu("File");
   JMenu editMenu = new JMenu("Edit");

   Vector DetailsV = new Vector();
   Vector GeneraV = new Vector();
   Vector RatingV = new Vector();
   Vector TableLabelsV = new Vector();

   JComboBox GeneraCB = new JComboBox(GeneraV);
   JComboBox RatingCB = new JComboBox(RatingV);


   
   JTable jt = new JTable(DetailsV,TableLabelsV);
   JScrollPane jsp = new JScrollPane(jt);

   File GeneraInputFile = new File("/home/buddha/code/homeworkJava","GeneraFile.txt");

   public homeworkJava()
   {
      super("DVD Database");

      container.setLayout(layout);    

      readData(GeneraInputFile,GeneraV);    

      commands.setText("COMMANDS");        

      GeneraLabel.setLabelFor(GeneraCB);
 
      RatingLabel.setLabelFor(RatingCB);     
  
      box1.add(GeneraLabel);
      box1.add(GeneraCB);

      box2.add(RatingLabel);
      box2.add(RatingCB);

      box3.add(outputArea1Label);
      box3.add(jsp);   

      fileMenu.add(new JMenuItem("Open"));
      fileMenu.add(new JMenuItem("Close"));
      fileMenu.add(new JMenuItem("Search"));

      editMenu.add(new JMenuItem("Cut"));
      editMenu.add(new JMenuItem("Copy"));
      editMenu.add(new JMenuItem("Paste"));

      bar.add(fileMenu);
      bar.add(editMenu);
      
      TableLabelsV.add("Genera");
      TableLabelsV.add("Rating");
      TableLabelsV.add("Title");
      TableLabelsV.add("Discription");

      bar.setBackground(Color.white);

      box1.setBackground(Color.white);
      box2.setBackground(Color.white);
      box3.setBackground(Color.white);
      
      container.setBackground(Color.white);  
      
      c.fill = GridBagConstraints.HORIZONTAL;
      c.weightx = 1;
      c.weighty = 1;
      c.gridx = 0;
      c.gridy = 0;
      c.gridwidth=3;
      container.add(commands,c);    

      c.gridx=0;
      c.gridy=1;
      c.gridwidth=1;
      container.add(box1,c);
 
      c.gridx=2;
      c.gridy=1;
      c.gridwidth=0;
      container.add(box2,c);       
      
      c.fill = GridBagConstraints.BOTH;
      c.gridx=0;
      c.gridy=2;
      c.gridheight=6;
      c.gridwidth=3;
      container.add(box3,c);


      setJMenuBar(bar);
      setSize(300,300);
      setVisible(true); 
   } 

   public static void main(String args[])
   {
      homeworkJava application = new homeworkJava();
      application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }

   public void readData(File inputFile,Vector DataStorage)
   {/////////////////work on this option 
     try
      {
        BufferedReader in = new BufferedReader(new FileReader(inputFile));
        StringTokenizer tokens;

        while((tokens = new StringTokenizer(in.readLine()))!=null)
        {
          while(tokens.hasMoreTokens())
            DataStorage.add(tokens.nextToken());
        }
      }
      catch(FileNotFoundException e)
      {
        System.out.println("File is not accessable");
      }
   }
}

aaa · 07-19-2004, 10:44 AM

Right after:
catch(FileNotFoundException e)
{
System.out.println("File is not accessable");
}

Add 'catch(IOException e){ ....'
FileNotFoundException isn't the only exception thrown.