- 追加された行はこの色です。
- 削除された行はこの色です。
[[目次]]
#contents
~
*リスナー登録の各種方法 [#u18f8b05]
**リスナーインタフェースをインプリメントして作成したオリジナルのリスナークラス内に、呼び出し元のFrameインスタンスを参照するフィールドを用意する方法 [#i017785c]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
Button b1;
public SampleApp() {
this.setSize(300, 200);
b1 = new Button("Click");
MyButtonActionAdapter ba = new MyButtonActionAdapter();
ba.sampleApp = this;
b1.addActionListener(ba);
this.add(b1,BorderLayout.CENTER);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
}
class MyButtonActionAdapter implements ActionListener {
SampleApp sampleApp;
public void actionPerformed(ActionEvent ev) {
sampleApp.b1.setLabel("you clicked.");
}
}
**リスナーインタフェースをインプリメントして作成したオリジナルのリスナークラスを、Frameクラスを継承したオリジナルクラスの内部クラスにする方法★★★ [#yf6c2dfb]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
Button b1;
public SampleApp() {
this.setSize(300, 200);
b1 = new Button("Click");
b1.addActionListener(new MyButtonActionAdapter());
this.add(b1,BorderLayout.CENTER);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
class MyButtonActionAdapter implements ActionListener {
public void actionPerformed(ActionEvent ev) {
b1.setLabel("you clicked.");
}
}
}
**Frameクラスを継承したクラスに、リスナーインタフェースをインプリメントし、イベントリスナーを定義する方法 [#i8706747]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame implements ActionListener {
Button b1;
public SampleApp() {
this.setSize(300, 200);
b1 = new Button("Click");
b1.addActionListener(this);
this.add(b1,BorderLayout.CENTER);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
public void actionPerformed(ActionEvent ev) {
b1.setLabel("you clicked.");
}
}
**イベントリスナー追加時に、イベントリスナーを無名クラスとして定義する方法★★ [#ie4d1416]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
Button b1;
public SampleApp(){
this.setSize(300, 200);
b1 = new Button("Click");
b1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
b1.setLabel("you clicked.");
}
});
this.add(b1,BorderLayout.CENTER);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
}
↓クローズボックスで閉じる処理を無名クラスで定義するサンプル
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
public SampleApp(){
this.setSize(300, 200);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent ev) {
System.exit(0);
}
});
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
}
*レイアウトマネージャー変更方法 [#lf7af319]
**FlowLayoutでボタン10個を登録するサンプル [#v656b333]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
public SampleApp() {
this.setSize(300, 200);
this.setLayout(new FlowLayout());
for (int i = 0; i < 10; i++) {
this.add(new Button("No," + i));
}
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
}
**GridLayoutでボタン10個を登録するサンプル [#f0955659]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
public SampleApp() {
this.setSize(300, 200);
this.setLayout(new GridLayout(4, 4));
for (int i = 0; i < 10; i++) {
this.add(new Button("No," + i));
}
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
}
**レイアウトマネージャを使わずに、ボタン10個を位置を決めて配置するサンプル [#uc52220f]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
public SampleApp() {
this.setSize(300, 200);
this.setLayout(new GridLayout(4, 4));
for (int i = 0; i < 10; i++) {
Button b = new Button("No," + i);
b.setBounds(new Rectangle(i * 25 + 50, i * 25 + 50, 100, 20));
this.add(b);
}
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
}
*各種コンポーネントサンプル [#ldf3c05a]
**Checkbox [#vea7a719]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
Checkbox cb1;
public SampleApp() {
this.setSize(300, 200);
cb1 = new Checkbox("not checked.");
cb1.addItemListener(new MyItemAdapter());
this.add(cb1,BorderLayout.CENTER);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
class MyItemAdapter implements ItemListener {
public void itemStateChanged(ItemEvent ev) {
if (cb1.getState()) {
cb1.setLabel("checked.");
} else {
cb1.setLabel("not checked.");
}
}
}
}
**RadioButton [#s019ba84]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
Button b1;
Label l1;
CheckboxGroup cg1;
public SampleApp() {
this.setSize(300, 200);
this.setLayout(new GridLayout(5, 1));
cg1 = new CheckboxGroup();
for (int i = 0; i < 3; i++) {
Checkbox cb = new Checkbox("No," + i, cg1, false);
this.add(cb);
}
l1 = new Label();
this.add(l1);
b1 = new Button("Click");
b1.addActionListener(new MyActionAdapter());
this.add(b1);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
class MyActionAdapter implements ActionListener {
public void actionPerformed(ActionEvent ev) {
Checkbox cb = cg1.getSelectedCheckbox();
l1.setText(cb.getLabel());
}
}
}
**TextField [#b16dbf14]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
Label l1;
TextField t1;
public SampleApp() {
this.setSize(300, 200);
l1 = new Label("0");
this.add(l1,BorderLayout.CENTER);
t1 = new TextField("0",20);
t1.addActionListener(new MyActionAdapter());
this.add(t1,BorderLayout.SOUTH);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
class MyActionAdapter implements ActionListener {
public void actionPerformed(ActionEvent ev) {
try {
int n = Integer.parseInt(t1.getText());
n /= 1.05;
l1.setText(Integer.toString(n));
} catch(Exception ex) {}
}
}
}
**Choice [#v518f870]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
Label l1;
Choice c1;
public SampleApp() {
this.setSize(300, 200);
l1 = new Label();
this.add(l1,BorderLayout.NORTH);
c1 = new Choice();
c1.add("Japan");
c1.add("America");
c1.add("Europa");
c1.add("Asia");
c1.add("Africa");
c1.add("Other");
c1.addItemListener(new MyItemAdapter());
this.add(c1,BorderLayout.CENTER);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
class MyItemAdapter implements ItemListener {
public void itemStateChanged(ItemEvent ev) {
int n = c1.getSelectedIndex();
String str = c1.getSelectedItem();
l1.setText(Integer.toString(n) + "," + str);
}
}
}
**List [#i342c4e7]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
Label l1;
List lt1;
public SampleApp() {
this.setSize(300, 200);
l1 = new Label();
this.add(l1,BorderLayout.NORTH);
lt1 = new List(5, true);
lt1.add("Japan");
lt1.add("America");
lt1.add("Europa");
lt1.add("Asia");
lt1.add("Africa");
lt1.add("Other");
lt1.addItemListener(new MyItemAdapter());
this.add(lt1, BorderLayout.CENTER);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
class MyItemAdapter implements ItemListener {
public void itemStateChanged(ItemEvent ev) {
String str = "";
for (int i = 0; i < lt1.getItemCount(); i++) {
if (lt1.isIndexSelected(i))
str += lt1.getItem(i) + " ";
}
l1.setText(str);
}
}
}
*イベント利用方法 [#u60532c9]
**MouseEvent [#ua771818]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
Label l1;
public SampleApp() {
this.setSize(300, 200);
l1 = new Label();
this.add(l1,BorderLayout.NORTH);
this.addMouseListener(new MyMouseAdapter());
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
class MyMouseAdapter extends MouseAdapter {
public void mouseClicked(MouseEvent ev) {
int x = ev.getX();
int y = ev.getY();
int n = ev.getClickCount();
String str = "X:" + Integer.toString(x);
str += " Y:" + Integer.toString(y);
str += " click:" + Integer.toString(n);
l1.setText(str);
}
}
}
**KeyEvent [#x921751b]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
TextField t1, t2;
Label l1;
public SampleApp() {
this.setSize(300, 200);
t1 = new TextField();
t1.addKeyListener(new MyKeyAdapter());
this.add(t1,BorderLayout.NORTH);
t2 = new TextField();
t2.addKeyListener(new MyKeyAdapter());
this.add(t2,BorderLayout.SOUTH);
l1 = new Label();
this.add(l1,BorderLayout.CENTER);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
class MyKeyAdapter extends KeyAdapter {
public void keyTyped(KeyEvent ev) {
char c = ev.getKeyChar();
TextField t = (TextField)ev.getSource();
String s = t.getName();
l1.setText("\"" + c + "\"\t" + s);
}
}
}
**FocusEvent [#c043caf5]
import java.awt.*;
import java.awt.event.*;
public class SampleApp extends Frame {
TextField t1, t2;
Label l1;
public SampleApp() {
this.setSize(300, 200);
t1 = new TextField();
t1.addFocusListener(new MyFocusAdapter());
this.add(t1,BorderLayout.NORTH);
t2 = new TextField();
t2.addFocusListener(new MyFocusAdapter());
this.add(t2,BorderLayout.SOUTH);
l1 = new Label();
this.add(l1,BorderLayout.CENTER);
this.setVisible(true);
}
public static void main(String[] args) {
new SampleApp();
}
class MyFocusAdapter extends FocusAdapter {
public void focusGained(FocusEvent ev) {
String s1 = "";
String s2 = "";
TextField t1 = (TextField)ev.getSource();
TextField t2 = (TextField)ev.getOppositeComponent();
if (t1 != null) s1 = t1.getName();
if (t2 != null) s2 = t2.getName();
l1.setText(s1 + " → " + s2);
}
}
}
