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1 AWT GUI Button,TextArea, TextField Component Button Component Canvas Checkbox Choice Container Label List Scrollbar TextComponent Panel Window TextArea TextField Applet Dialog Frame 20-1 Component Component GUI Component Component Component OFF void Dimension getsize( ) setsize( int w, int h ) setsize( Dimension d ) Dimension height, width Button b = new Button( "Hurry Up!" ); add( b ); Dimension bsize = b.getsize( ); System.out.println( "Width: " + bsize.width + " Height : " + bsize.height ); b.setsize( 100, 40 ); Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-1

2 Point getlocation( ) setlocation( int x, int y ) setlocation( Point p ) Point x, y Point blocation = b.getlocation( ); System.out.println( "x axis: " + blocation.x + " y axis : " + blocation.y ); b.setlocation( 10, 20 ); Rectangle x, y, width, height Rectangle getbounds( ) setbounds( Rectangle r ) setbounds( int x, int y, int width, int height ) Color getbackground( ) setbackground( Color color ) Color getforeground( ) setforeground( Color color ) Color backcolor = getbackground( ); bb.setbackground( Color.yellow ); Color forecolor = getforeground( ); b.setforeground( Color.red ); Font getfont( ) void setfont( Font font ) ta ta.setfont( new Font( "SansSerif", Font.BOLD, 18 ) ); true false void setvisible( boolean visibleswitch ) boolean isvisible( ) void setenabled( boolean enableswitch ) boolean isenabled( ) Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-2

3 true b.setvisible( true ); b.setenable( false ); // b // b drawline Graphics getgraphics( ) Container getparent( ) null Graphics g = this.getgraphics( ); g.drawline( 10, 10, 100, 100 ); // paint( Graphics g ) repaint( ) Button ActionListener Checkbox ItemListener Choice ItemListener List ActionListener ItemListener Scrollbar AdjustmentListener TextArea TextListener TextField ActionListener TextListener Choice ActionListener public void actionperformed( ActionEvent e ) ItemListener public void itemstatechanged( ItemEvent e ) TextListener public void textvaluechanged( TextEvent e ) Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-3

4 AdjustmentListener public void adjustmentvaluechanged( AdjustmentEvent e ) Canvas ScrollPane Container Button Button( ) Button( String label ) String getlabel( ) setlabel( String label ) addactionlistner( ActionListener listener ) removeactionlistner( ActionListner listener ) String getactioncommand( ) setactioncommand( String command ) import java.awt.*; import java.awt.event.*; import java.applet.*; public class SignalButtons extends Applet implements ActionListener { Button red, green, yellow; green = new Button( "Green" ); green.setbackground( Color.green ); green.addactionlistener( this ); add( green ); yellow = new Button( "Yellow" ); yellow.setbackground( Color.yellow ); yellow.addactionlistener( this ); add( yellow ); red = new Button( "Red" ); red.setbackground( Color.red ); red.addactionlistener( this ); add( red ); green.setvisible( false ); yellow.setvisible( false ); Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-4

5 public void actionperformed( ActionEvent e ) { if ( red.isvisible( ) ) { red.setvisible( false ); green.setvisible( true ); else if ( green.isvisible( ) ) { green.setvisible( false ); yellow.setvisible( true ); else { yellow.setvisible( false ); red.setvisible( true ); Checkbox Checkbox( ) Checkbox( String Label ) Checkbox( String Label, boolean state ) on true off false Checkbox( String Label, boolean state, CheckboxGroup group ) String getlabel( ) setlabel( String Label ) boolean getstate( ) on=true, off=false setstate( boolean state ) CheckboxGroup getcheckboxgroup( ) setcheckboxgroup( CheckboxGroup group ) additemlistener( ItemListener Listener) removeitemlistener( ItemListener Listener ) itemstatechanged repaint paint getstate import java.awt.*; import java.awt.event.*; import java.applet.*; public class CheckTester extends Applet implements ItemListener { Checkbox frame = new Checkbox( "Frame", true ), fill = new Checkbox( "Fill" ), reverse= new Checkbox( "Reverse" ); frame.additemlistener( this ); fill.additemlistener( this ); reverse.additemlistener( this ); add( frame ); add( fill ); add( reverse ); public void paint( Graphics g ) { super.paint( g ); if ( fill.getstate( ) ) { g.setcolor( (reverse.getstate( ))? Color.blue : Color.red ); g.fillrect( 20, 30, 100, 100 ); if ( frame.getstate( ) ) { g.setcolor( (reverse.getstate( ))? Color.red : Color.blue ); g.drawrect( 20, 30, 100, 100 ); public void itemstatechanged( ItemEvent e ) { repaint( ); Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-5

6 CheckboxGroup CheckboxGroup( ) getselectedcheckbox null Checkbox getselectedcheckbox( ) setselectedcheckbox( Checkbox box ) ItemListener itemstatechanged String fontname [ ] = {"Seif", "SansSerif", "MonoSpaced" ; // CheckboxGroup group= new CheckboxGroup( ); Checkbox fontbox [ ] = new Checkbox[ fontname.length ]; for ( int i = 0; i< fontname.length ; i++ ) { fontbox[ i ] = new Checkbox( fontname[ i ] ); fontbox[ i ].setcheckboxgroup( group ); add( fontbox[ i ] ); // init Choice Choice( ) String getitem( int index ) int getitemcount( ) int getselectedindex( ) String getselecteditem( ) add( String item ) insert( String item, int index ) remove( int index) remove( String item) removeall( ) select( int index ) select( String item ) additemlistener( ItemListener Listener ) removeitemlistener( ItemListener Listener ) ItemListener itemstatechanged Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-6

7 import java.awt.*; import java.awt.event.*; import java.applet.*; public class ColorSelector extends Applet implements ItemListener { Choice colorselect; int selected = 0; String names [ ] = {"red", "green", "blue", "orange", "yellow" Color colors [ ] = { Color.red, Color.green, Color.blue, Color.orange, Color.yellow ; colorselect = new Choice( ); for ( int i=0; i< names.length ; i ++ ) { colorselect.additem( names[ i ] ); colorselect.additemlistener( this ); colorselect.select( 0 ); add( colorselect ); public void paint( Graphics g ) { super.paint( g ); g.setcolor( colors[ selected ] ); g.fillrect( 20, 30, 100, 100 ); public void itemstatechanged( ItemEvent e ) { selected = colorselect.getselectedindex( ); repaint( ); Label drawstring setfont Label( ) Label( String message ) Label( String message, int align ) align String gettext( ) settext( String message ) int getalignment( ) setalignment( int align ) Label.LEFT Label.CENTER Label.RIGHT init add( new Label( "Please input name of a fighter", Label.CENTER ) ); Label level = new Label( ); level.settext( 10 + " liters" ); level.setalignment( Label.RIGHT ); add( level ); Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-7

8 List Choice multiple true false List( ) List( int rows ) List( int rows, boolean multiple ) String getitem( int index ) String [ ] getitems( ) int getitemcount( ) int getrows( ) int getselectedindex( ) int [ ] getselectedindexes( ) String getselecteditem( ) add( String item ) insert( String item, int index ) remove( int index ) remove( String item ) removeall( ) select( int index ) select( String item ) deselect( int index ) ActionListener ItemListener ItemListener additemlistener( ItemListener Listener ) removeitemlistener( ItemListener Listener ) addactionlistner( ActionListener Listener ) removeactionlistner( ActionListner Listener ) import java.applet.*; import java.awt.*; import java.awt.event.*; public class ListTester extends Applet implements ActionListener { String items [ ] = { "White", "Black", "Green", "Red", "Blue" ; List List = new List( ); for ( int i = 0 ; i < items.length ; i++ ) { List.add( items[ i ] ); List.addActionListener( this ); add( List ); public void actionperformed( ActionEvent e ) { System.out.println( List.getSelectedItem( ) ); Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-8

9 Scrollbar Scrollbar( ) Scrollbar( int orientation ) Scrollbar( int orientation, int value, int visible, int minimum, int maximum ) Scrollbar.VERTICALScrollbar.HORIZONTAL BlockIncrement VisibleAmount int getblockincrement( ) int getmaximum( ) int getminimum( ) int getorientation( ) int getvalue( ) int getvisibleamount( ) setblockincrement( int block ) setmaximum( int maximum ) setminimum( int minimum ) setorientation( int orientation ) setvalue( int newvalue ) setvisibleamount( int newamount ) setvalues( int value, int visible, int min, int max ) addadjustmentlistener( AdjustmentListener Listener ) removeadjustmentlistener( AdjustmentListener Listener ) import java.awt.*; import java.awt.event.*; import java.applet.*; public class ScrollbarTester extends Applet implements AdjustmentListener { Scrollbar bar= new Scrollbar( Scrollbar.HORIZONTAL, 0, 10, 0, 100 ); Label value = new Label( "" + bar.getvalue( ) ); setlayout( new BorderLayout( ) ); bar.addadjustmentlistener( this ); add( "South", bar ); add( "Center", value ); public void adjustmentvaluechanged( AdjustmentEvent e ) { value.settext( "" + bar.getvalue( ) ); repaint( ); Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-9

10 TextArea TextArea( ) TextArea( String text ) TextArea( int rows, int columns ) TextArea(String text, int rows, int columns, int Scrollbars) TextArea.SCROLLBARS_NONE TextArea.SCROLLBARS_HORIZONTAL_ONLY TextArea.SCROLLBARS_VERTICAL_ONLY TextArea.SCROLLBARS_BOTH TextField String gettext( ) settext( String text ) int getcaretposition( ) 0 setcaretposition( int position ) String getselectedtext( ) int getselectedstart( ) 0 int getselectedend( ) 0 boolean iseditable( ) true seteditable( boolean sw ) select( int start, int end ) selectall( ) Dimension getminimumsize( ) Dimension getpreferredsize( ) append( String str ) insert( String str, int pos ) replacerange( String str, int start, int end ) int getcolumns( ) setcoloumns( int columns ) int getrows( ) setrows( int rows ) TextField addtextlistener( TextListener Listener ) removetextlistener( TextListener Listener ) TextField TextArea Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-10

11 TextField( ) TextField( String text ) TextField( int columns ) TextField( String text, int columns ) int getcolumns( ) setcolumns( int columns ) char getechochar( ) setechochar( char echo ) boolean echocharisset( ) true Return Enter ActionEvent addactionlistner(actionlistener Listener) removeactionlistner(actionlistner Listener) setlayout( null ); setlayout( new FlowLayout( ) ); // setlayout( new FlowLayout( FlowLayout.LEFT ) ); // setlayout( new FlowLayout( FlowLayout.RIGHT ) ); // setlayout( new BorderLayout( ) ); add( "North", new Button( "OK" ) ); // add( "South", new Button( "Back" ) ); // add( "West", new Button( "Left" ) ); // add( "East", new Button( "Right" ) ); // add( "Center", new Button( "Look" ) ); // add setlayout( new GridLayout( 2, 3 ) ); //2 3 setlayout( new GridLayout( 2, 3, 10, 15 ) ); // 1015 HTML Table Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-11

12 GridBagLayout gb = new GridBagLayout( ); GridBagConstraints gc = new GridBagConstraints( ); GridBagConstraints GridBagLayout setconstraints Button button = new Button( "OK" ); gb.setconstraints( button, gc ); int anchor; int fill; int gridwidth, gridheight; int gridx, gridy; int ipadx, ipady; anchor CENTER, EAST, NORTHEAST, NORTH, NORTHWEST, WEST, SOUTHWEST, SOUTH, SOUTHEAST GridBagConstraints.CENTER CENTER fill BOTH, HORIZONTAL, VERTICAL, NONE NONE gridx, gridy 0 init Choice it OK (TextField) Cancel 22-2 GridBagLayout gb = new GridBagLayout( ); GridBagConstraints gc = new GridBagConstraints( ); setlayout( gb ); gc.fill = GridBagConstraints.BOTH; // // // gc.ipadx = 10; gc.ipady = 10; // 10 gc.gridx = 0; gc.gridy = 0; gc.gridwidth = 1; gc.gridheight = 2; Button choice = new Button( "Choice It" ); gb.setconstraints( choice, gc ); add( choice ); gc.gridx = 1; gc.gridy = 0; gc.gridwidth = 2; gc.gridheight = 1; TextField field = new TextField( 20 ); gb.setconstraints( field, gc ); add( field ); gc.gridx = 1; gc.gridy = 1; gc.gridwidth = 1; gc.gridheight = 1; Button ok = new Button( "OK" ); gb.setconstraints( ok, gc ); add( ok ); gc.gridx = 2; gc.gridy = 1; Button cancel = new Button( "Cancel" ); gb.setconstraints( cancel, gc ); add( cancel ); // 1 // // Choice It // 2 1 // // TextField // OK // Cancel Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-12

13 ComponentContainer Applet Container Panel Window 20-2 Container Applet Dialog Frame Panel Panel mypanel = new Panel( ); // mypanel.setlayout( new GridLayout( 3, 4, 10, 15 ) ); // mypanel.add( new Button( "WOW" ) ); // add( mypanel ); // Panel init Panel mypanel [ ] = new Panel[ 3 ]; setlayout( new GridLayout( mypanel.length, 1 ) ); for ( int i=0; i<mypanel.length ; i++) { mypanel[ i ] = new Panel( ); add( mypanel[ i ] ); mypanel[ 0 ].add( new Checkbox( "Green" ) ); mypanel[ 0 ].add( new Checkbox( "Red" ) ); mypanel[ 0 ].add( new Checkbox( "Blue" ) ); mypanel[ 1 ].add( new TextField( 60 ) ); mypanel[ 2 ].add( new Button( "OK" ) ); mypanel[ 2 ].add( new Button( "Cancel" ) ); CardLayout card = new CardLayout( ) setlayout( card ); Panel p1 = new Panel( ); add( "summer", p1 ); Panel p2 = new Panel( ); add( "winter", p2 ); show Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-13

14 card.show( this, "summer" ); card.show( this, "winter" ); // summer // winter import java.awt.*; import java.awt.event.*; import java.applet.* ; public class SceneViwer extends Applet implements ActionListener { String course [ ] = { "enterance", "room", "dining", "study", "bedroom", "exit" ; Panel scene [ ] = new Panel[ course.length ]; CardLayout scenario = new CardLayout( ); int cur = 0; setlayout( scenario ); for ( int i=0; i < course.length ; i++ ) { Button b = new Button( course[ i ] ); b.addactionlistener( this ); scene[ i ] = new Panel( ); scene[ i ].add( Button ); add( course[ i ], scene[ i ] ); public void paint( Graphics g ) { scenario.show( this, course[ cur ] ); public void actionperformed( ActionEvent ae ) { cur = (cur+1) % course.length; repaint( ); Window Frame Dialog Frame Modal Dialog setvisible true import java.applet.*; import java.awt.*; import java.awt.event.*; public class DialogTester extends Applet implements ActionListener { Dialog dialog = new Dialog( new Frame( ), "Enter Text", true); Button change = new Button( "Change" ), ok = new Button( "OK" ); TextField present = new TextField( "None", 20 ), input = new TextField( 30 ); change.setactioncommand( "Change" ); change.addactionlistener( this ); Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-14

15 ok.addactionlistener( this ); input.addactionlistener( this ); present.seteditable( false ); add( present ); add( change ); dialog.setlayout( new FlowLayout( ) ); dialog.add( input ); dialog.add( ok ); public void actionperformed( ActionEvent e ) { if ( e.getactioncommand( ).equals( "Change" ) ) { dialog.show( ); else { dialog.setvisible( false ); present.settext( input.gettext( ) ); repaint( ); Menu MenuBar FramesetMenuBar MenuItem ActionListener actionperformed Choice import import import java.applet.*; java.awt.*; java.awt.event.*; public class MenuBarTester extends Applet implements ActionListener { String command [ ] = { "Start", "Stop", "Continue", "Reset" ; MenuBar mb = new MenuBar( ); Menu menu = new Menu( "File" ); TextField tf = new TextField( 30 ); Frame f = new Frame( "MenuBarTester" ); for ( int i = 0; i < command.length; i++ ) { MenuItem mitem = new MenuItem( command[ i ] ); mitem.addactionlistener( this ); mitem.setactioncommand( command[ i ] ); menu.add( mitem ); mb.add( menu ); f.setmenubar( mb ); f.setsize( 100, 50 ); f.show( ); add( tf ); public void actionperformed( ActionEvent e ) { tf.settext( e.getactioncommand( ) ); repaint( ); Copyright by Tatsuo Minohara 2004 Rev. A Dec. 16th Macintosh Java Primer Chapter 20-15

Local variable x y i paint public class Sample extends Applet { public void paint( Graphics gc ) { int x, y;... int i=10 ; while ( i < 100 ) {... i +=

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