Java Components are not displayed(sometimes)

[archanajathan]

My java applications consists of a 2 JTextArea, JButton, and 2 images.

When i execute my program, i have noticed that sometimes all these components dont get displayed.

For example, the 1st JTextArea gets displayed but the rest of the components are hidden. The JButton gets displayed when i move the mouse over it and the 2nd textarea gets displayed when i select its text.

I have included setVisible(True); at every possible and needed step.

This problem sounds strange. And it happens atleast once in 3 executions. Rest of the 2 executions seems just normal (as expected).

[hardwired]

Let's see how you put your gui together.

[archanajathan]

Code:

import javax.swing.*;
import java.awt.*;
import java.io.*;
import javax.imageio.*;
import java.awt.image.*;
import java.awt.event.*;
import java.applet.*;
import java.net.*;

public class welcome extends JFrame
{
	JTextArea txt=new JTextArea("WELCOME");		//TEXT AREA
	JTextArea txt1=new JTextArea("HELLO");		//TEXT AREA
	JButton enter=new JButton(" ENTER ");		//ENTER BUTTON
	JLabel label_image1=new JLabel();		
	JLabel label_image2=new JLabel();	

	JPanel jp=(JPanel)this.getContentPane();
	
	
	public static void main(String args[])
	{
		new welcome();
	}
	
	public welcome()
	{
		setExtendedState(getExtendedState() | Frame.MAXIMIZED_BOTH);//MAXIMIZES THE WINDOW ON EXECUTION
		try
		{
		label_image1.setIcon(new ImageIcon("a4.jpg"));				//SETS THE IMAGES OF THE LABELS
		label_image2.setIcon(new ImageIcon("a5.jpg"));
		
		jp.setLayout(null);//REQUIRED TO POSITION THE COMPONENTS 
		jp.setBackground(new Color(0,0,0));							//FRAME BACKGROUND SET TO BLACK
		
		enter.setForeground(new Color(0,255,255));					//ENTER BUTTON FOREGROUND = LIGHT BLUE
		txt.setForeground(new Color(255,0,0));						//FOREGROUND OF TEXT = RED
		txt1.setForeground(new Color(255,0,0));						//FOREGROUND OF TEXT = RED
		
		enter.setBackground(new Color(0,0,255));					//BACKGROUND OF BUTTON = DARK BLUE
		txt.setBackground(new Color(0,0,0));						//BACKGROUND OF TEXT = BLACK
		txt1.setBackground(new Color(0,0,0));						//BACKGROUND OF TEXT = BLACK
		
		enter.setFont(new Font("Cooper Black",Font.PLAIN, 30));		//FONT OF ENTER BUTTON
		txt.setFont(new Font("Courier", Font.BOLD, 48));			//FONT OF TEXT
		txt1.setFont(new Font("Courier", Font.BOLD, 20));			//FONT OF TEXT
		
		enter.setBounds(430,450,150,50);							//PARAMETERS(X,Y,WIDTH,HEIGHT)
		txt.setBounds(300,100,400,200);								//SET POSITION AND SIZE OF THE COMPONENTS 
		txt1.setBounds(300,350,500,100);								//SET POSITION AND SIZE OF THE COMPONENTS 
		label_image1.setBounds(50,50,100,200);
		label_image2.setBounds(600,550,100,200);
		
		enter.setBorder(BorderFactory.createLineBorder(Color.red, 10));	//CREATE BORDER FOR ENTER BUTTON AS RED
		txt.setEditable(false);											//SET TO UNEDITABLE
		txt1.setEditable(false);											//SET TO UNEDITABLE
		
		setSize(800,600);											//SET SIZE OF FRAME 
		setVisible(true);
		
		
		jp.add(enter);
		setVisible(true);												//ADDED ALL THE COMPONENTS TO FRAME/PANEL
		jp.add(txt);
		setVisible(true);
		jp.add(txt1);
		setVisible(true);
		jp.add(label_image1);
		setVisible(true);
		jp.add(label_image2);
		setVisible(true);
		}catch(Exception e){}
		
	}
}

Do execute the code 4-5 times.. I have not sent the images.. It is supposed to diaplay 2 texts, 1 button and 2 images.

[hardwired]

Works okay now: all components show up and remain visible.

Code:

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

public class Welcome extends JFrame
{
    JTextArea txt=new JTextArea("Welcome");
    JTextArea txt1=new JTextArea("Hello");
    JButton enter=new JButton(" Enter ");
    JLabel label_image1=new JLabel(); 
    JLabel label_image2=new JLabel(); 

    JPanel jp=(JPanel)this.getContentPane();

    public static void main(String args[])
    {
        new Welcome();
    }

    public Welcome()
    {
//        setExtendedState(getExtendedState() | Frame.MAXIMIZED_BOTH);
        label_image1.setIcon(new ImageIcon(//"a4.jpg"));
                                           "images/Bird.gif"));
        label_image2.setIcon(new ImageIcon(//"a5.jpg"));
                                           "images/Rabbit.gif"));

        jp.setLayout(null); 
//        jp.setBackground(new Color(0,0,0));

//        enter.setForeground(new Color(0,255,255));
        txt.setForeground(new Color(255,0,0));
        txt1.setForeground(new Color(255,0,0));

//        enter.setBackground(new Color(0,0,255));
//        txt.setBackground(new Color(0,0,0));
//        txt1.setBackground(new Color(0,0,0));

        enter.setFont(new Font("Cooper Black",Font.PLAIN, 30));
        txt.setFont(new Font("Courier", Font.BOLD, 48));
        txt1.setFont(new Font("Courier", Font.BOLD, 20));

        enter.setBounds(430,450,150,50);  // ) <-- errant brace
        txt.setBounds(300,100,400,200);
        txt1.setBounds(300,350,500,100);
        Dimension d = label_image1.getPreferredSize();
        label_image1.setBounds(//50,50,100,200);
                               50,50,d.width,d.height);
        d = label_image2.getPreferredSize();
        label_image2.setBounds(//600,550,100,200);  // was offscreen
                               50,350,d.width,d.height);

//        enter.setBorder(BorderFactory.createLineBorder(Color.red, 10));
        txt.setEditable(false);
        txt1.setEditable(false);

        jp.add(enter);
        jp.add(txt);
        jp.add(txt1);
        jp.add(label_image1);
        jp.add(label_image2);

        setSize(800,600);
        setLocation(100,100);
        // Always call this method last.
        setVisible(true);
    }
}