disappering butttons

[billykd4dpb]

Here is my issue. I have a frame with label, jtextfield, and 2 buttons when you run the program the label and the textfield show but the butttons dont until you mouse over them. i was told i needed to post here from eclipse forum even though this is cut and paist from a you tube video but didnt run using winbuilder. When i try to run the Scientific Caalculator it has the messages the"cannot refer to nonfinal verible in scope.
i am running ubuntu linux and openjdk 8.0
here is my code
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

//import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class SC4 {
static JFrame frame;
static JTextField textField;

double first;
double second;
double result;
String operation;
String answer;
//private final ButtonGroup buttonGroup = new ButtonGroup();


public static void main(String[] args) {
	// TODO Auto-generated method stub

	//private void initialize() {
		JFrame frame = new JFrame();
		frame.setForeground(Color.WHITE);
		frame.getContentPane().setForeground(Color.BLACK);
		frame.setBounds(100, 100, 357, 539);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().setLayout(null);
		frame.setVisible(true);
		
		JLabel lblNewLabel = new JLabel("SCIENTFIC CALCULATOR");
		lblNewLabel.setBounds(10, 11, 320, 27);
		lblNewLabel.setFont(new Font("Tahoma", Font.BOLD, 23));
		frame.getContentPane().add(lblNewLabel);

		JTextField textField = new JTextField();
		textField.setFont(new Font("Tahoma", Font.BOLD, 15));
		textField.setBounds(10, 39, 320, 63);
		frame.getContentPane().add(textField);
		textField.setColumns(10);
		
		JButton btn2 = new JButton("2");
		btn2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				String number = textField.getText() + btn2.getText();
				textField.setText(number);
			}
		});
		btn2.setFont(new Font("Tahoma", Font.BOLD, 23));
		btn2.setBounds(139, 398, 64, 50);
		frame.getContentPane().add(btn2);
		
		JButton btn5 = new JButton("5");
		btn5.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				String number = textField.getText() + btn5.getText();
				textField.setText(number);
			}
		});
		btn5.setFont(new Font("Tahoma", Font.BOLD, 23));
		btn5.setBounds(139, 347, 64, 50);
		frame.getContentPane().add(btn5);

[ptziegler]

Here is my issue. I have a frame with label, jtextfield, and 2 buttons when you run the program the label and the textfield show but the butttons dont until you mouse over them.

I don't think that's necessarily a WindowBuilder bug but just how Swing behaves. The primary issues seems to be that you call frame.setVisible(true), before adding the buttons. Because you also don't use a layout, there is no incentive for Swing to redraw the button area. That is until you hover over them.

In short, there are two ways to fix this:

• Call frame.setVisible(true); at the end of the method, once everything has been added.
• Use something like GridLayout, FlowLayout.

The latter one is the more elegant and also more stable solution.

When i try to run the Scientific Caalculator it has the messages the"cannot refer to nonfinal verible in scope.

That's sadly not something I could reproduce with the code snippet you provided. Which version of WindowBuilder are you using? Almost any newer version should require at least Java 11, so I find it odd that you mention Java 8.

[merks]

@ptziegler

Note that this above is hand written code and is not using WindowBuilder as also appears in this thread:

https://www.eclipse.org/forums/index.php?t=msg&th=1113069&goto=1859241&#msg_1859241

[wimjongman]

This should be a discussion but I cannot convert it.

[ptziegler]

I've converted it to a discussion, but I think the issue is unrelated to WindowBuilder and rather a question about how/when the UI is rendered in Swing.