/** * Simple1.java - 处理事件的第一种方法 * 在这个例子中,利用一个ActionListener来监听事件源产生的事件 * 用一些if语句来决定是哪个事件源 */ import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Simple1 { private static JFrame frame; // 定义为静态变量以便main...
Include code that implements the methods in listener interface. For example: public void actionPerformed(ActionEvent e) { ...//code that reacts to the action... } In general, to detect when the user clicks an onscreen button (or does the keyboard equivalent), a program must have an objec...
The code that defines the ActionListener interface, looks something like this: 1 package java.awt.event; 2 import java.util.EventListener; 3 4 public interface ActionListener extends EventListener { 5 6 public void actionPerformed(ActionEvent e); 7 8 } The ActionListener example is an interfac...
In addition to theactionPerformedmethod defined by theActionListenerinterface, this interface allows the application to define, in a single place: One or more text strings that describe the function. These strings can be used, for example, to display the flyover text for a button or to set the...
(broker, clientId); MqttConnectOptions options = new MqttConnectOptions(); aClient.connect(options, new IMqttActionListener() { public void onSuccess(IMqttToken asyncActionToken) { System.out.println("Connected"); } public void onFailure(IMqttToken asyncActionToken, Throwable exception) { ...
ActionListener的actionPerformed()方法必须被覆盖。该方法包含了事件的对应动作。该方法的参数为事件对象,即监听ActionEvent类型的事件。ActionEvent是一个高层的类,Java会找到图形对象(按钮)会发生的典型事件(点击)作为事件。 ColorAction生成的对象即为监听器对象。
glassButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { glass.setVisible(false); p1.repaint(); } }); } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18.
Examples of functional interfaces includeRunnable,Callable, andActionListener.功能接口的示例包括Runnable,Callable和ActionListener。 Functionabove is a functional interface with just one method:apply.Function以上是只用一个方法的功能的接口:apply。It takes one argument and produces a result.它接受一个参数并产...
8019180 client-libs javax.swing Use JComboBox as it's own ActionListener leads to unexpected behaviour 8028616 client-libs javax.swing Htmleditorkit parser doesn't handle leading slash (/) 8029196 client-libs javax.swing Focus border of JButton.buttonType=roundRect is cut off ...
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.InputVerifier; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JTextField; ...