Tricky solutions for some Java Swing issue
Almost all beginner Java Swing programmers meet these issues. I have written some code example for representing the solution. This issue collection is useful for some situation, but please comment it.
Maximize a Java Frame
How to maximize the JFrame (main window) from code:
import java.swing.JFrame; public class MyFrame extend JFrame { public MyFrame() { // the application window is run as maximized this.maximize(); // some code ... } /** * Maximize the Frame. */ public void maximize() { this.setExtendedState(this.getExtendedState() | JFrame.MAXIMIZED_BOTH); } }
JTextArea Auto scroll down
Add a JTextArea to a JPanel:
public class MyFrame extend JFrame { private JTextArea area; //... public MyFrame() { //... JScrollPane pane = new JScrollPane(); this.area = new JTextArea(); this.area.setLineWrap(true); this.area.setWrapStyleWord(true); this.area.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10)); this.area.setText("Hello"); pane.setPreferredSize(new Dimension(200,200)); pane.getViewport().add(area); panel.add(pane); add(panel); //... } //... }
Next, append some message to the JTextArea. For example these are a log messages, what show real-time events. This case the textarea need to scrolling down to show the last message in every time.
Append some message example:
//... public void setMessage(String msg) { this.area.append(msg + "\n"); this.area.setCaretPosition(area.getDocument().getLength()); } //...







Some interesting tips ,thanks !
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Submitted by pavan kumar srinivasan (not verified) on April 23, 2008 - 1:08pm.Post new comment