Java Learning Class 58th session-gui

Gui

Graghical user Interface (GUI)

Java provides GUI for objects that exist in java.awt and java.swing packages

Java's GUI does a really good job of just C + + and so on. Not going to waste too much time on this.

A simple window Demo

public static void Main (string[] args) {frame f = new Frame ("New Window"); F.setlocation (400, 200);//Set the position of the window F.setsize (500, 400); /Set Window size//f.setbounds (400, 200, 500, 400), function equivalent to the above two sentences f.setlayout (New FlowLayout ());//Set streaming layout Button bt = New Button (" a button "); F.add (BT); f.setvisible (true);//Display window}

When the window is displayed, the window cannot be closed.Event Monitoring Mechanism

its composition: Event sources (components), events, listeners (Listener), event handling (post-event handling)

public static void Main (string[] args) {frame f = new Frame ("New Window"); F.setlocation (400, 200);//Set the position of the window F.setsize (500, 400); /Set Window size//f.setbounds (400, 200, 500, 400), function equivalent to the above two sentences f.setlayout (New FlowLayout ());//Set streaming layout Button bt = New Button (" a button "); F.add (BT);//Because the event cannot be shut down. To register a listener//window adapter class Windowadapter, the entire method has been overridden to create a listener f.addwindowlistener (new Windowadapter () {public void windowclosing (WindowEvent e) {system.exit (0);}}); /Join Window Monitor f.setvisible (TRUE);//Display window}

User-to-component operations. is an event. Then the component that generates the event is the source of the event.

ActionListener Demo:

public static void Main (string[] args) {frame f = new Frame ("New Window"); F.setlocation (400, 200);//Set the position of the window F.setsize (500, 400); /Set Window size//f.setbounds (400, 200, 500, 400), function equivalent to the above two sentences f.setlayout (New FlowLayout ());//Set streaming layout Button bt = New Button (" a button "); F.add (BT);//Because this event is not closed, to register a listener//window adapter class Windowadapter, has covered all methods, convenient to create listener F.addwindowlistener (new Windowadapter () {public void windowclosing (WindowEvent e) {system.exit (0);}}); /Join window Listener//Add a listener event to the button: Click Exit Bt.addactionlistener (New ActionListener () {@Overridepublic void actionperformed ( ActionEvent e) {//system.out.println ("pressed"); System.exit (0);}); F.setvisible (TRUE);//Display window}

Keyboard and mouse monitoring events

Import Java.awt.button;import java.awt.flowlayout;import Java.awt.frame;import Java.awt.textfield;import Java.awt.event.keyadapter;import Java.awt.event.keyevent;import Java.awt.event.mouseadapter;import Java.awt.event.mouseevent;import Java.awt.event.windowadapter;import Java.awt.event.windowevent;public class Main { Private Frame f;private TextField tf;//text box private Button bt;public Main () {init ();} private void Init () {f = new Frame ("Mouse and Keyboard Listener"); bt = New button ("button"); F.setbounds (n, A, A, a); F.setlayout (New Flo Wlayout ()); tf = new TextField (40);//Specify Number of columns F.add (TF); F.add (BT); MyEvent (); f.setvisible (true);} private void MyEvent () {//Add keyboard listener Tf.addkeylistener to text box (new Keyadapter () {@Overridepublic void keypressed (KeyEvent e) {// Press//system.out.println ("Key Pressed:" +e.getkeychar () + ":" +e.getkeycode () + ":" +e.getkeytext (E.getkeycode ()));// Press to print/*int code = E.getkeycode (); Code>=keyevent.vk_0 && Code <= keyevent.vk_9)//Inference {System.out.println ("required number"); E.consume ();//use. Doesn't follow the default.Processing mode}if (E.getkeycode () ==keyevent.vk_enter) {//press ENTER SYSTEM.OUT.PRINTLN ("ENTER ...");} */if (E.iscontroldown () && E.getkeycode () ==keyevent.vk_enter) {//Press CTRL + ENTER SYSTEM.OUT.PRINTLN ("Crtl Enter .....");}}});/ /Join the Exit Listener on the window F.addwindowlistener (new Windowadapter () {public void windowclosing (WindowEvent e) {system.exit (0);}}); /Add Mouse listener Bt.addmouselistener (new Mouseadapter () {private int count = 1;//counter on button public void mouseentered (MouseEvent e) {//The mouse touches the trigger Tf.settext ("Mouse Enter:" +count++);//information added to the text box}public void mouseclicked (MouseEvent e) {//Click if ( E.getclickcount () ==2) {//Get the number of clicks, double-click SYSTEM.OUT.PRINTLN ("mouseclicked double click");} /*else if (E.getclickcount () ==1) {System.out.println ("mouseclicked only Click");} */}});} public static void Main (string[] args) {new Main ();}}

About the swing package. You need to install the plugin in Ecplice.

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Java Learning Class 58th session-gui