How to use

setSize

method

in

java.awt.Window

 import java.awt.*;
import java.awt.geom.Line2D;
import javax.swing.*;

public class FrameTest {
  public static void main(String[] args) {
    JFrame jf = new JFrame("Demo");
    Container cp = jf.getContentPane();
    cp.add(new JComponent() {
      public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        g2.setStroke(new BasicStroke(10));
        g2.draw(new Line2D.Float(30, 20, 80, 90));
      }
    });
    jf.setSize(300, 200);
    jf.setVisible(true);
  }
}

 import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JRadioButton;


public class Rb  extends JFrame {
Rb (){
   JRadioButton male = new JRadioButton("male");
   JRadioButton female = new JRadioButton("Female");
   ButtonGroup bG = new ButtonGroup();
   bG.add(male);
   bG.add(female);
   this.setSize(100,200);
   this.setLayout( new FlowLayout());
   this.add(male);
   this.add(female);
   male.setSelected(true);
   this.setVisible(true);
 }
public static void main(String args[]){
  Rb j = new Rb();
}

 import java.awt.*;
import java.awt.event.*;

class FrameByeBye {

  // The method we wish to call on exit.
  public static void showMessage() {
    System.out.println("Bye Bye!");
  }

  public static void main(String[] args) {
    Frame f = new Frame("Say Bye Bye!");
    f.addWindowListener( new WindowAdapter() {
      @Override
      public void windowClosing(WindowEvent we) {
        showMessage();
        System.exit(0);
      }
    } );
    f.setSize(300,200);
    f.setLocationByPlatform(true);
    f.setVisible(true);
  }
}

constraints.fill = GridBagConstraints.BOTH;
JLabel l = new JLabel("You have got 2 new Messages.");
panel.add(l, constraints);
constraints.gridx++;
constraints.weightx = 0f;
b.setMargin(new Insets(1, 4, 1, 4));
b.setFocusable(false);
panel.add(b, constraints);
dialog.setUndecorated(true);
dialog.setSize(300, 100);
dialog.setLocation(screenSize.width - dialog.getWidth(),
    screenSize.height - taskBarSize - dialog.getHeight());

JFrame frame = new JFrame();
frame.setTitle("Test Background");
frame.setLocation(200, 100);
frame.setSize(600, 400);
frame.addWindowListener(new WindowAdapter() {
frame.setVisible(true);

  defaultItem.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
      setVisible(true);
      setExtendedState(JFrame.NORMAL);
      try {
        tray.add(trayIcon);
        setVisible(false);
        System.out.println("added to SystemTray");
      } catch (AWTException ex) {
      try{
  tray.add(trayIcon);
  setVisible(false);
  System.out.println("added to SystemTray");
  }catch(AWTException ex){
setVisible(true);
setSize(300, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

private JFrame frame = new JFrame("Test");
private JPanel panel = new JPanel();
private JLabel label = new JLabel("CenteredJLabel");
  panel.add(label);
  panel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
  frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
  frame.add(panel);
  frame.setSize(400, 300);
  frame.setLocationRelativeTo(null);
  frame.setVisible(true);

label1 = new JLabel("max 10 chars");
textfield1 = new JTextField(15);
add(label1);
add(textfield1);
textfield1.setDocument(new JTextFieldLimit(10));
setSize(300,300);
setVisible(true);

 import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainClass extends JPanel {

 public MainClass() {

   addMouseListener(new MouseAdapter() { 
     public void mousePressed(MouseEvent me) { 
      System.out.println(me); 
     } 
    }); 

 }

 public static void main(String[] args) {
  JFrame frame = new JFrame();
  frame.getContentPane().add(new MainClass());

  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  frame.setSize(200, 200);
  frame.setVisible(true);
 }
}

JPanel jp = new JPanel();
jp.setLayout(new BorderLayout());
JTabbedPane tb = new JTabbedPane();
tb.add("Tab4", new JTextArea(""));
tb.add("Tab5", new JTextArea(""));
jp.add(tb, BorderLayout.CENTER);
add(jp, BorderLayout.CENTER);
tb.setEnabledAt(1, false);
tb.setEnabledAt(3, false);
JFrame frame = new JFrame();
frame.getContentPane().add(new TabbedPane());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 200);
frame.setVisible(true);

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

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
    frame.setSize(600, 400);

    JPanel panel = new JPanel() {
      @Override
      public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.BLUE);
        g.fillRect(0, 0, 100, 100);
      }
    };
    frame.add(panel);

    // Graphics g = panel.getGraphics();
    // g.setColor(Color.BLUE);
    // g.fillRect(0, 0, 100, 100);

    frame.validate(); // because you added panel after setVisible was called
    frame.repaint(); // because you added panel after setVisible was called
  }
}

MyButton button = new MyButton("Hello, World!");
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 400);
contentPane.add(button);
frame.setVisible(true);

JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setSize(600, 400);
frame.add(panel);

 import javax.swing.*;

class CenterTheDialog {

  CenterTheDialog() {
    for (int ii=1; ii<4; ii++) {
      JFrame f = new JFrame("Frame " + ii);
      f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

      f.setSize(400,300);
      f.setLocationByPlatform(true);
      f.setVisible(true);

      JDialog d = new JDialog(f);
      d.setSize(300,200);
      d.setLocationRelativeTo(f);
      d.setVisible(true);
    }
  }

  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        new CenterTheDialog();
      }
    });
  }
}

JFrame f = new JFrame();
f.setSize(500, 500);
f.setTitle("Sometimes Red, Sometimes Blue");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setContentPane(new TestPanel());
f.setVisible(true);

table.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
final JScrollPane scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setSize(400, 300);
frame.setVisible(true);

JFrame frame = new JFrame("Labels in a circle");
frame.setSize(500, 500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();;
SpringLayout layout = new SpringLayout();
for (Point point : points) {
 JLabel label = new JLabel("Point " + count);
 panel.add(label);
 count++;
 layout.putConstraint(SpringLayout.WEST, label, point.x, SpringLayout.WEST, panel);
frame.add(panel);
frame.setVisible(true);

public static void main(String args[]) {
  FrameTestBase t = new FrameTestBase();
  t.add(new JComponent() {
    public void paintComponent(Graphics g) {
      String str = "hello world!";
  t.setDefaultCloseOperation(EXIT_ON_CLOSE);
  t.setSize(400, 200);
  t.setVisible(true);

super("Add component on JFrame at runtime");
setLayout(new BorderLayout());
this.panel = new JPanel();
this.panel.setLayout(new FlowLayout());
add(panel, BorderLayout.CENTER);
JButton button = new JButton("CLICK HERE");
add(button, BorderLayout.SOUTH);
button.addActionListener(this);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500, 500);
setVisible(true);
this.panel.add(new JButton("Button"));
this.panel.revalidate();
validate();

JFrame frame = new JFrame();
frame.setTitle("Welcome!");
frame.setSize(520, 480);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel heroShotPanel = new JPanel();
JLabel heroShot = new JLabel(heroShotImage);
heroShotPanel.add(heroShot);
JPanel submitPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
submitPanel.add(start);
frame.getContentPane().add(heroShotPanel, BorderLayout.NORTH);
frame.getContentPane().add(submitPanel, BorderLayout.SOUTH);
frame.setVisible(true);
frame.getRootPane().setDefaultButton(start);
start.requestFocus();