Resizing JPanel and its inner components when JFrame is maximised

[Anusha Bhatnagar]

Hi,

I'm using a JPanel with absolute Layout Manager.Then I add it to my Frame.I want to resize the components and the panel when the frame is maximised.I have tried many ways but nothing seems to work like trying using BorderLayout for the frame when adding the panel etc

Here the code skeleton

LoginSuccess(User user){
		setTitle("Job Monitor");
		getContentPane().setLayout(new BorderLayout());

		this.u=user;
		
		con=u.getConnection();

		String roles[]=new String[getUserRoleNames(u,con).length];
		int i=0;
		for(String s: getUserRoleNames(u,con)){

			roles[i]=s;
			i++;
		};		
		String accesslevels[]=new String[getUserAccessLevels(u,con).size()];
		int j=0;
		for(String s: getUserAccessLevels(u,con)){

			accesslevels[j]=s;

			j++;
		};	


		String jobtags[]=new String[getJobTags(u,con).size()];
		int k=0;
		for(String s: getJobTags(u,con)){

			jobtags[k]=s;

			k++;
		};	

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(400, 400, 820, 776);
		contentPane = new JPanel();
		contentPane.setBackground(Color.WHITE);
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		getContentPane().add(contentPane,BorderLayout.CENTER);
		contentPane.setLayout(new BorderLayout());
		//contentPane.setBounds(contentPane.getParent().getBounds());
		contentPane.setLayout(new BorderLayout(0, 0));


		JCalendar jcal=new JCalendar();
		jcal.setBounds(7, 50, 186, 118);
		contentPane.add(jcal);

		JButton btnSubmit = new JButton("Submit");
		btnSubmit.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {

				setVisible(false);
				JobMonitor jm=new JobMonitor(u);

			}
		});
		btnSubmit.setBounds(320, 552, 89, 23);
		contentPane.add(btnSubmit);

		JLabel lblNewLabel = new JLabel("Roles");
		lblNewLabel.setForeground(Color.BLUE);
		lblNewLabel.setBackground(Color.BLUE);
		lblNewLabel.setBounds(314, 43, 89, 14);
		contentPane.add(lblNewLabel);
		 setPreferredSize(new Dimension(300,400)); // Makes pack() start at this size
		JList Accesslist = new JList(accesslevels);
		Accesslist.setBounds(20, 392, 113, 50);
		contentPane.add(Accesslist);

		JLabel lblJobs = new JLabel("Jobs");
		lblJobs.setForeground(Color.BLUE);
		lblJobs.setLabelFor(Accesslist);
		lblJobs.setBounds(491, 43, 46, 14);
		contentPane.add(lblJobs);
		//contentPane.pack();
		contentPane.setPreferredSize(this.getSize()); //setPreferredSize(new Dimension(int length, int width))
		JLabel lblAccesslevels = new JLabel("Access Levels");
		lblAccesslevels.setForeground(Color.BLUE);
		lblAccesslevels.setBounds(21, 379, 163, 14);
		contentPane.add(lblAccesslevels);
		JList joblist=new JList(jobtags);
		joblist.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

		JScrollPane listscroller = new JScrollPane(joblist);
		listscroller.setBounds(491, 68, 205, 426);
		contentPane.add(listscroller);
		JList rolelist=new JList(roles);
		JScrollPane rolescroller = new JScrollPane(rolelist);
		rolelist.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
		rolescroller.setBounds(314, 68, 153, 224);
		contentPane.add(rolescroller);

		JLabel lblNewLabel_1 = new JLabel("Select Tasks forom the database");
		lblNewLabel_1.setFont(new Font("Arial", Font.BOLD, 15));
		lblNewLabel_1.setBounds(43, 11, 300, 14);
		contentPane.add(lblNewLabel_1);

		JCheckBox chckbxNewCheckBox = new JCheckBox("Outstanding Tasks");
		chckbxNewCheckBox.setBounds(20, 475, 122, 14);
		contentPane.add(chckbxNewCheckBox);

		JCheckBox chckbxNewCheckBox_1 = new JCheckBox("Waiting on User");
		chckbxNewCheckBox_1.setBounds(20, 492, 121, 14);
		contentPane.add(chckbxNewCheckBox_1);

		JCheckBox chckbxNewCheckBox_2 = new JCheckBox("Stopped on Error");
		chckbxNewCheckBox_2.setBounds(20, 509, 121, 14);
		contentPane.add(chckbxNewCheckBox_2);

		JCheckBox chckbxNewCheckBox_3 = new JCheckBox("Running");
		chckbxNewCheckBox_3.setBounds(20, 458, 97, 14);
		contentPane.add(chckbxNewCheckBox_3);

		JCheckBox chckbxNewCheckBox_4 = new JCheckBox("Blocked");
		chckbxNewCheckBox_4.setBounds(20, 543, 97, 14);
		contentPane.add(chckbxNewCheckBox_4);

		JCheckBox chckbxCompleted = new JCheckBox("Completed");
		chckbxCompleted.setBounds(20, 526, 97, 14);
		contentPane.add(chckbxCompleted);

		JCheckBox chckbxCron = new JCheckBox("Cron");
		chckbxCron.setBounds(199, 456, 97, 14);
		contentPane.add(chckbxCron);

		JCheckBox chckbxExecute = new JCheckBox("Execute");
		chckbxExecute.setBounds(199, 473, 97, 14);
		contentPane.add(chckbxExecute);

		JCheckBox chckbxExternal = new JCheckBox("External");
		chckbxExternal.setBounds(199, 492, 97, 14);
		contentPane.add(chckbxExternal);

		JCheckBox chckbxInteractive = new JCheckBox("Interactive");
		chckbxInteractive.setBounds(199, 509, 97, 14);
		contentPane.add(chckbxInteractive);

		JCheckBox chckbxSystem = new JCheckBox("System");
		chckbxSystem.setBounds(199, 526, 97, 14);
		contentPane.add(chckbxSystem);

		JCheckBox chckbxVerify = new JCheckBox("Verify");
		chckbxVerify.setBounds(199, 543, 97, 14);
		contentPane.add(chckbxVerify);

		JLabel lblCategories = new JLabel("Categories");
		lblCategories.setBounds(20, 439, 89, 14);
		contentPane.add(lblCategories);

		JLabel lblType = new JLabel("Type");
		lblType.setBounds(199, 439, 46, 14);
		contentPane.add(lblType);


		JCalendar calendar=new JCalendar();
		pack();


	}
}



Please let me know what I'm doing wrong.

[Rob Camick]

I'm using a JPanel with absolute Layout Manager.

That is your problem. Don't use a null layout.

Simply create a panel and add it to the frame using:

frame.add( thePanel );

By default it will go to the CENTER of the BorderLayout and will automatically size whenever the frame is resized.