#################
NestedLayout.java Layout of complicated GUI by taking advantage of nested containers. Uses WindowUtilities.java and ExitListener.java. 
##################
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;

/** An example demonstrating the use of nested containers
 *  to lay out the components. See GridBagTest.java for
 *  implementation by a single layout manager, GridBagLayout.
 *
 *******************
 */

public class NestedLayout extends JPanel {

  private JTextArea textArea;
  private JButton bSaveAs, bOk, bExit;
  private JTextField fileField;

  public NestedLayout() {

    setLayout(new BorderLayout(2,2));
    setBorder(BorderFactory.createEtchedBorder());

    textArea = new JTextArea(12,40);  // 12 rows, 40 cols
    bSaveAs = new JButton("Save As");
    fileField = new JTextField("C:Document.txt");
    bOk = new JButton("OK");
    bExit = new JButton("Exit");

    add(textArea,BorderLayout.CENTER);

    // Set up buttons and textfield in bottom panel.
    JPanel bottomPanel = new JPanel();
    bottomPanel.setLayout(new GridLayout(2,1));

    JPanel subPanel1 = new JPanel();
    JPanel subPanel2 = new JPanel();
    subPanel1.setLayout(new BorderLayout());
    subPanel2.setLayout(new FlowLayout(FlowLayout.RIGHT,2,2));

    subPanel1.add(bSaveAs,BorderLayout.WEST);
    subPanel1.add(fileField,BorderLayout.CENTER);
    subPanel2.add(bOk);
    subPanel2.add(bExit);

    bottomPanel.add(subPanel1);
    bottomPanel.add(subPanel2);

    add(bottomPanel,BorderLayout.SOUTH);
  }

  public static void main(String[] args) {
    WindowUtilities.setNativeLookAndFeel();
    JFrame frame = new JFrame("Nested Containers");
    frame.setContentPane(new NestedLayout());
    frame.addWindowListener(new ExitListener());
    frame.pack();
    frame.setVisible(true);
  }
}
##########################

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Tags:Java/J2EE/J2MELayout Managers
Post Data:2017-01-02 16:04:35

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NullTest.java Explicit placement of five buttons with the layout manager turned off (set to null)
##########################
import java.applet.Applet;
import java.awt.*;

/** Layout managers are intended to help you, but there
 *  is no law saying you have to use them.
 *  Set the layout to null to turn them off.
 *
*******************
public class NullTest extends Applet {
  public void init() {
    setLayout(null);
    Button b1 = new Button("Button 1");
    Button b2 = new Button("Button 2");
    Button b3 = new Button("Button 3");
    Button b4 = new Button("Button 4");
    Button b5 = new Button("Button 5");
    b1.setBounds(0, 0, 150, 50);
    b2.setBounds(150, 0, 75, 50);
    b3.setBounds(225, 0, 75, 50);
    b4.setBounds(25, 60, 100, 40);
    b5.setBounds(175, 60, 100, 40);
    add(b1);
    add(b2);
    add(b3);
    add(b4);
    add(b5);
  }
}

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BoxLayoutTest.java A textfield and three buttons arranged by a verticle BoxLayout. Uses WindowUtilities.java and ExitListener.java. 
##################
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/** An example of BoxLayout.
 *
 ***********

public class BoxLayoutTest extends JPanel
                           implements ActionListener{
  BoxLayout layout;
  JButton topButton, middleButton, bottomButton;

  public BoxLayoutTest() {
    layout = new BoxLayout(this, BoxLayout.Y_AXIS);
    setLayout(layout);

    JLabel label = new JLabel("BoxLayout Demo");

    topButton = new JButton("Left Alignment");
    middleButton = new JButton("Center Alignment");
    bottomButton = new JButton("Right Alignment");
    topButton.addActionListener(this);
    middleButton.addActionListener(this);
    bottomButton.addActionListener(this);

    add(label);
    add(topButton);
    add(middleButton);
    add(bottomButton);
    setBackground(Color.white);
  }

  public void actionPerformed(ActionEvent event) {
    if (event.getSource() == topButton) {
      refresh(Component.LEFT_ALIGNMENT);
    } else if (event.getSource() == middleButton) {
      refresh(Component.CENTER_ALIGNMENT);
    } else if (event.getSource() == bottomButton) {
      refresh(Component.RIGHT_ALIGNMENT);
    }
  }

  private void refresh(float alignment){
    topButton.setAlignmentX(alignment);
    middleButton.setAlignmentX(alignment);
    bottomButton.setAlignmentX(alignment);
    revalidate();
    System.out.println("x: "+layout.getLayoutAlignmentX(this));
  }

  public static void main(String[] args) {
    WindowUtilities.setNativeLookAndFeel();
    WindowUtilities.openInJFrame(new BoxLayoutTest(), 300, 135,
                                 "BoxLayoutTest");
  }
}

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FlowTest.java 
*************
FlowTest.java Five buttons arranged by FlowLayout
By default, FlowLayout arranges components in rows, left to right, and centered. 
/././././././././././././
import java.applet.Applet;
import java.awt.*;

/** FlowLayout puts components in rows.
 *
 ************************************
public class FlowTest extends Applet {
  public void init() {
    for(int i=1; i<6; i++) {
      add(new Button("Button " + i));
    }
  }
}

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import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

/** An applet that lets you perform freehand drawing.
 *  

 ****************

public class SimpleWhiteboard extends Applet {
  protected int lastX=0, lastY=0;

  public void init() {
    setBackground(Color.white);
    setForeground(Color.blue);
    addMouseListener(new PositionRecorder());
    addMouseMotionListener(new LineDrawer());
  }

  protected void record(int x, int y) {
    lastX = x;
    lastY = y;
  }

  // Record position that mouse entered window or
  // where user pressed mouse button.
  
  private class PositionRecorder extends MouseAdapter {
    public void mouseEntered(MouseEvent event) {
      requestFocus(); // Plan ahead for typing
      record(event.getX(), event.getY());
    }

    public void mousePressed(MouseEvent event) {
      record(event.getX(), event.getY());
    }
  }

  // As user drags mouse, connect subsequent positions
  // with short line segments.
  
  private class LineDrawer extends MouseMotionAdapter {
    public void mouseDragged(MouseEvent event) {
      int x = event.getX();
      int y = event.getY();
      Graphics g = getGraphics();
      g.drawLine(lastX, lastY, x, y);
      record(x, y);
    }
  }
}

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import java.applet.Applet;
import java.awt.*;

/** Lets the user enter the name of any
 *  good programming language. Or does it?
 *  

 *********************

public class JavaTextField extends Applet {
  public void init() {
    setFont(new Font("Serif", Font.BOLD, 14));
    setLayout(new GridLayout(2, 1));
    add(new Label("Enter a Good Programming Language",
                  Label.CENTER));
    LanguageField langField = new LanguageField();
    Font langFont = new Font("SansSerif", Font.BOLD, 18);
    langField.setFont(langFont);
    add(langField);
  }
}

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

/** A spelling-correcting TextField for entering
 *  a language name.
 *  

 *******************

public class LanguageField extends TextField {
  private String[] substrings =
    { "", "J", "Ja", "Jav", "Java" };

  public LanguageField() {
    addKeyListener(new SpellingCorrector());
    addActionListener(new WordCompleter());
    addFocusListener(new SubliminalAdvertiser());
  }

  // Put caret at end of field.
  
  private void setCaret() {
    setCaretPosition(5);
  }
  
  // Listener to monitor/correct spelling as user types.
  
  private class SpellingCorrector extends KeyAdapter {
    public void keyTyped(KeyEvent event) {
      setLanguage();
      setCaret();
    }

    // Enter partial name of good programming language that
    // most closely matches what they've typed so far.
    
    private void setLanguage() {
      int length = getText().length();
      if (length < = 4) {
        setText(substrings[length]);
      } else {
        setText("Java");
      }
      setCaret();
    }
  }

  // Listener to replace current partial name with
  // most closely-matching name of good language.
  
  private class WordCompleter implements ActionListener {

    // When they hit RETURN, fill in the right answer.
    
    public void actionPerformed(ActionEvent event) {
      setText("Java");
      setCaret();
    }
  }

  // Listener to give the user a hint.
  
  private class SubliminalAdvertiser extends FocusAdapter {
    public void focusGained(FocusEvent event) {
      String text = getText();
      for(int i=0; i<10; i++) {
        setText("Hint: Java");
        setText(text);
      }
    }
  }
}

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import java.applet.Applet;
import java.awt.*;
import java.awt.event.*; 

/** Prints non-detailed reports of mouse events.
 *  Uses the low-level processXxxEvent methods instead
 *  of the usual event listeners.
 *  

 *****************

public class MouseReporter extends Applet {
  public void init() {
    setBackground(Color.blue); // So you can see applet in page
    enableEvents(AWTEvent.MOUSE_EVENT_MASK |
                 AWTEvent.MOUSE_MOTION_EVENT_MASK);
  }

  public void processMouseEvent(MouseEvent event) {
    System.out.println("Mouse enter/exit or click at (" +
                       event.getX() + "," +
                       event.getY() + ").");
    // In case there are MouseListeners attached:
    super.processMouseEvent(event); 
  }

  
  public void processMouseMotionEvent(MouseEvent event) {
    System.out.println("Mouse move/drag at (" +
                       event.getX() + "," +
                       event.getY() + ").");
    // In case there are MouseMotionListeners attached:
    super.processMouseMotionEvent(event);
  }
}

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import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

/** Draw circles centered where the user clicks.
 *  Uses anonymous inner classes.
 *  

**********************
public class CircleDrawer4 extends Applet {
  public void init() {
    setForeground(Color.blue);
    addMouseListener
      (new MouseAdapter() {
         private int radius = 25;

         public void mousePressed(MouseEvent event) {
           Graphics g = getGraphics();
           g.fillOval(event.getX()-radius,
                      event.getY()-radius,
                      2*radius,
                      2*radius);
         }
      });
  }
}
*******************

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import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

/** Draw circles centered where the user clicks.
 *  Uses named inner classes.
 *  

 ******************

public class CircleDrawer3 extends Applet {
  public void init() {
    setForeground(Color.blue);
    addMouseListener(new CircleListener());
  }

  private class CircleListener extends MouseAdapter {
    private int radius = 25;

    public void mousePressed(MouseEvent event) {
      Graphics g = getGraphics();
      g.fillOval(event.getX()-radius,
                 event.getY()-radius,
                 2*radius,
                 2*radius);
    }
  }
}

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