Java------Graphical Interface (i)

Import Java.awt.color;import java.awt.dimension;import Java.awt.font;import Java.awt.graphicsenvironment;import Java.awt.event.actionevent;import Java.awt.event.actionlistener;import Java.awt.event.mouseevent;import Java.awt.event.mouselistener;import Javax.swing.buttongroup;import Javax.swing.jcheckbox;import Javax.swing.jcombobox;import Javax.swing.jframe;import Javax.swing.jmenu;import Javax.swing.JMenuBar;import Javax.swing.jmenuitem;import Javax.swing.joptionpane;import Javax.swing.jpopupmenu;import Javax.swing.jradiobutton;import Javax.swing.jscrollpane;import Javax.swing.jtextarea;import Javax.swing.JToolBar; public class Editorjframe extends JFrame implements actionlistener,mouselistener{private JTextArea text;//text Area private JComboBox comboxname,comboxsize;//combo Box private jcheckbox chkbold,chkitalic;//glyph check box private jradiobutton[] Radiocolors ;//Color radio button Array Private jpopupmenu popmenu;//shortcut menu Private Boolean istrue=true;private color Color;private boolean bool=true; Public Editorjframe () {Super ("Text compiler"); This.setdefaultcloseoperation (exit_on_close);//dimension Dim=this.gettoolkit (). Getscreensize ();// Get screen resolution//this.setbounds (DIM.WIDTH/4, DIM.HEIGHT/4, DIM.WIDTH/2, DIM.HEIGHT/2); This.setsize (800, 600);// Set window size this.setlocationrelativeto (null);//Set window position centered text = new JTextArea ("Welcome ..."); This.getcontentpane (). Add ( New JScrollPane (text)); JToolBar toolbar=new JToolBar ();//toolbar, default horizontal orientation This.getcontentpane (). Add (ToolBar, "North");// Toolbar added to the Frame Contents pane North Graphicsenvironment ge=graphicsenvironment.getlocalgraphicsenvironment (); String[] Fontsname=ge.getavailablefontfamilynames ();//Get system font comboxname =new JComboBox (fontsname);// The combo box displays the system font Comboxname.addactionlistener (this);//Register the Action event listener Toolbar.add (Comboxname) on the combo box; String[] sizestr={"," "" "," "", "" "," "};comboxsize=new JComboBox (SIZESTR);//font combo box comboxsize.seteditable (True )///Set combo box as editable comboxsize.addactionlistener (this);//combo Box Register action event Listener toolbar.add (comboxsize); Chkbold =new Jcheckbox ("bold "); Chkbold.addactionlistener (this); Toolbar.add (chkbold); Chkitalic=new JcheCkbox ("italic"); Chkitalic.addactionlistener (this); Toolbar.add (chkitalic); string[] colorstrs={"Red", "green", "Blue"};radiocolors=new jradiobutton[colorstrs.length]; Buttongroup bgroup=new Buttongroup (); for (int i=0;i<radiocolors.length;i++) {radiocolors[i]=new JRadioButton ( Colorstrs[i]);//Color radio button Radiocolors[i].addactionlistener (this); Bgroup.add (Radiocolors[i]); Toolbar.add ( Radiocolors[i]);} Addmymenu (); Text.addmouselistener (this); This.setvisible (true);} private void Addmymenu () {JMenuBar menubar=new jmenubar (); This.setjmenubar (MenuBar);//Add menu bar string[] menustrs={"file", " Edit "," help "}; Jmenu[] menu=new jmenu[menustrs.length];for (int i=0;i<menu.length;i++) {menu[i]=new JMenu (menuStrs[i]);// Menu Menubar.add (Menu[i]);} Menu[0].add (New JMenuItem ("Open")); Menu[0].add (New JMenuItem ("Save")); Menu[0].addseparator ();//Add menu item And with Exit JMenuItem menuitemexit=new JMenuItem ("Exit") separated by line; Menuitemexit.setactioncommand ("Exit"); Menuitemexit.addactionlistener (this); Menu[0].add (Menuitemexit); JMenuItem menucolor=new jmenuitem ("color"); menu[1].aDD (menucolor); Menucolor.addactionlistener (this);p opmenu=new jpopupmenu ();//shortcut menu string[] menuitemstrs={"Cut", "copy", "Paste"}; Jmenuitem[] popmenuitems=new jmenuitem[menuitemstrs.length];for (int i=0;i<popmenuitems.length;i++) { Popmenuitems[i]=new JMenuItem (menuitemstrs[i]);p Opmenu.add (popmenuitems[i]);p Opmenuitems[i].addactionlistener ( this);} Text.add (Popmenu);} public static void Main (string[] args) {new Editorjframe ();} public void mouseclicked (MouseEvent e) {if (E.getmodifiers () ==mouseevent.button3_mask) {//Display shortcut menu Popmenu.show (text, E.getx (), e.gety ());}}  public void mousepressed (MouseEvent e) {}public void mousereleased (MouseEvent e) {}public void mouseentered (MouseEvent e) {}public void mouseexited (MouseEvent e) {}public void actionperformed (ActionEvent e) {if (E.getsource () instanceof Jcombo Box | | E.getsource () instanceof Jcheckbox) {//control input font size is a valid number try{bool=!bool;//prevent pop-up two exceptions if (bool) {return;} String Fontname= (String) comboxname.getselecteditem (); int Size=integer.parseint (string) comboxsize.geTselecteditem ()); if (size<4 | | size>120) {istrue=false;throw new Exception ("Sizeexception");} Font Font=text.getfont (); int Style=font.getstyle (); if (E.getsource () ==chkbold) {//Glyph integer No. 0 is bold, first bit represents italic style=style^ 1;} if (E.getsource () ==chkitalic) {style=style^2;} Text.setfont (New Font (fontname,style,size)); bool=true;} catch (NumberFormatException E1) {Joptionpane.showmessagedialog (this, "\" "+ (String) Comboxsize.getselecteditem () +" \ "cannot be converted to integers, please re-enter!" "),//\" denotes quotation marks}catch (Exception E2) {if (E2.getmessage (). Equalsignorecase ("Sizeexception")) { Joptionpane.showmessagedialog (This, "the font is not suitable, please re-enter!") ");}}} if (E.getsource () instanceof Jradiobutton) {//press to respond to radio button if (E.getsource () ==radiocolors[0]) {color=new color (255,0,0) ;} if (E.getsource () ==radiocolors[1]) {color=new color (0,255,0);} if (E.getsource () ==radiocolors[2]) {color=new color (0,0,255);} Text.setforeground (color);} if (E.getsource () ==comboxsize) {if (!istrue) {//If not compliant, do not place the font size in the font-size combo box Istrue=true;return;} String size= (String) comboxsize.getselecteditem (); int I=0,n=comboxSize.getitemcount (); while (I<n&&integer.parseint (size) >=integer.parseint ((String) Comboxsize.getitemat (i)) {if (Integer.parseint (size) ==integer.parseint ((String) Comboxsize.getitemat (i)) {return ;} i++;} Comboxsize.insertitemat (size, i);}}}

Java------Graphical Interface (i)