GUI 4.1 GUI GUI MouseTest.java import javax.swing.*; import java.awt.*; import java.awt.event.*; /* 1 */
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1 25 4 GUI GUI GUI MouseTest.java /* 1 */ public class MouseTest extends JApplet implements MouseListener /* 2 */ { int x=50, y=20; addmouselistener(this); /* 3 */ super.paint(g); /* 4 */ g.drawstring("hello WORLD!", x, y); public void mouseclicked(mouseevent e) { /* 5 */ x = e.getx(); y = e.gety(); return; public void mousepressed(mouseevent e) { /* 6 */ public void mousereleased(mouseevent e) { /* 6 */ public void mouseentered(mouseevent e) { /* 6 */ public void mouseexited(mouseevent e) { /* 6 */
2 26 4 GUI java.awt.event.* import /* 1 */ import /* 5 */ mouseclicked MouseEvent mouseclicked MouseListener implement /* 2 */ MouseListener mousepressed, mousereleased, mouseentered, mouseexited /* 6 */ init addmouselistener(this) mouseclicked /* 3 */ this mouseclicked paint super.paint(g) super. /* 4 */ x, y mouseclicked MouseEvent getx, gety repaint() repaint JApplet paint interface C++ Java MouseListener public interface MouseListener { public void mouseclicked(mouseevent e); public void mousepressed(mouseevent e); public void mousereleased(mouseevent e); public void mouseentered(mouseevent e); public void mouseexited(mouseevent e); MouseListener MouseClicked repaint() MouseTest.java? Othello.java
3 U(p), D(own) KeyTest.java public class KeyTest extends JApplet implements KeyListener { int x=50, y=20; addkeylistener(this); super.paint(g); g.drawstring("hello WORLD!", x, y); public void keypressed(keyevent e) { int k = e.getkeycode(); if (k== u k== U ) { y-=10; else if (k== d k== D ) { y+=10; public void keyreleased(keyevent e) { public void keytyped(keyevent e) { Mouse Key MouseTest.java KeyListner keypressed, keyreleased, keytyped 3 keypressed KeyEvent getkeycode KeyTest.java KeyTest.java Shift, Ctrl, Alt KeyTest.java Shift : (JDKDIR)/docs/ja/api/java.awt.event.KeyEvent.html
4 28 4 GUI 4.2 GUI GUI GUI ChangeColor.java Fact.java mouseclicked keypressed GUI ActionEvent ChangeColor.java public class ChangeColor extends JApplet implements ActionListener { Color[] cs = {Color.red, Color.blue, Color.green, Color.orange; String str = "Hello World!"; int i=0; JButton b = new JButton("Next"); b.addactionlistener(this); /* 1 */ getcontentpane().setlayout(new FlowLayout()); /* 2 */ getcontentpane().add(b); /* 3 */ super.paint(g); g.setcolor(cs[i]); g.drawstring("hello WORLD!", 20, 50); i=(i+1)%cs.length;
5 4.2. GUI 29 JButton JApplet add getcontentpane() add 1 /* 3 */ /* 2 */ add FlowLayout actionperformed b actionperformed b addactionlistener /* 1 */ GUI 1 actionperformed e actionperformed i Fact.java public class Fact extends JApplet implements ActionListener { JTextField input; JLabel output; input=new JTextField("0", 8); output=new JLabel(" 1"); input.addactionlistener(this); getcontentpane().setlayout(new FlowLayout()); getcontentpane().add(input); getcontentpane().add(new JLabel(" ")); getcontentpane().add(output); getcontentpane().add(new JLabel(" ")); static int fact(int n) { int r = 1; for (; n>0; n--) { r *= n; return r; int n = Integer.parseInt(input.getText()); output.settext(" "+fact(n)); JTextField String int 2 JLabel GUI 1 J Applet Applet add JApplet
6 30 4 GUI actionperformed actionperformed input JTextField gettext output JLabel settext UpDownButton.java public class UpDownButton extends JApplet implements ActionListener { String str = "Hello World!"; int x=20; JButton left, right; left = new JButton("Left"); right = new JButton("Right"); left.addactionlistener(this); right.addactionlistener(this); getcontentpane().setlayout(new FlowLayout()); getcontentpane().add(left); getcontentpane().add(right); super.paint(g); g.drawstring("hello WORLD!", x, 55); if (e.getsource() == left) { // Left x-=10; else if (e.getsource() == right) { // Right x+=10; GUI 2 actionperformed ActionEvent getsource() == Fact.java 2
7 4.2. GUI 31 = String double GUI getsource() innner class UpDownButton.java UpDownButton2.java public class UpDownButton2 extends JApplet { String str = "Hello World!"; int x=20; JButton left, right; class LeftListener implements ActionListener { x-=10; class RightListener implements ActionListener { x+=10; left = new JButton("Left"); right = new JButton("Right"); left.addactionlistener(new LeftListener()); right.addactionlistener(new RightListener()); getcontentpane().setlayout(new FlowLayout()); getcontentpane().add(left); getcontentpane().add(right); super.paint(g); g.drawstring("hello WORLD!", x, 55); Java C LeftListener RightListener
8 32 4 GUI ActionPerformed repaint addactionlistner getsource, new ( ) { UpDownButton.java (anonymous class) UpDownButton3.java public class UpDownButton3 extends JApplet { String str = "Hello World!"; int x=20; JButton left, right; left = new JButton("Left"); right = new JButton("Right"); left.addactionlistener(new ActionListener() { x-=10; ); right.addactionlistener(new ActionListener() { x+=10; ); getcontentpane().setlayout(new FlowLayout()); getcontentpane().add(left); getcontentpane().add(right); super.paint(g); g.drawstring("hello WORLD!", x, 55);
9 4.2. GUI JTextArea Divisor.java public class Divisor extends JApplet implements ActionListener { JTextField input; JTextArea output; input = new JTextField("0", 8); output = new JTextArea(10, 20); input.addactionlistener(this); getcontentpane().setlayout(new FlowLayout()); getcontentpane().add(input); getcontentpane().add(output); int n = Integer.parseInt(input.getText()); int i; for(i=1; i<=n; i++) { if (n%i==0) { output.append(i+" "+n+" Y=n"); output.append(" Y=nY=n"); JTextArea C printf
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