英文:
Why does the compiler tell me "actionPerformed method not implemented"?
问题
import java.awt.*;import java.awt.event.*;import java.util.*;import javax.swing.*;import javax.swing.Timer;import javafx.event.ActionEvent;public class hello {public static void main(String[] args) {TalkClock clock = new TalkClock();clock.start(1000, true);System.out.println("xxxx");JOptionPane.showMessageDialog(null, "Quit program?");System.exit(0);}}class TalkClock {public void start(int interval, boolean beep) {ActionListener listener = new ActionListener() {public void actionPerformed(ActionEvent event) {System.out.println("At the tone, the time is " + new Date());if (beep) Toolkit.getDefaultToolkit().beep();}};Timer t = new Timer(interval, listener);t.start();}}
错误信息：
hello.java:24: 错误: <anonymous TalkClock$1> 不是抽象的, 并且不覆盖 抽象方法 actionPerformed(ActionEvent) 在 ActionListener 中{^1 个错误
英文:
import java.awt.*;import java.awt.event.*;import java.util.*;import javax.swing.*;import javax.swing.Timer;import javafx.event.ActionEvent;public class hello {public static void main(String[] args) {TalkClock clock = new TalkClock();clock.start(1000, true);System.out.println("xxxx");JOptionPane.showMessageDialog(null, "Quit program?");System.exit(0);}}class TalkClock{public void start(int interval, boolean beep){ActionListener listener = new ActionListener(){public void actionPerformed(ActionEvent event) {System.out.println("At the tone, the time is " + new Date());if (beep) Toolkit.getDefaultToolkit().beep();}};Timer t = new Timer(interval, listener);t.start();}}
I run it in my Mac. The error is
hello.java:24: error: <anonymous TalkClock$1> is not abstract and does not override abstract method actionPerformed(ActionEvent) in ActionListener{^1 error
答案1
得分: 2
你从JavaFX导入了ActionEvent。你需要导入swing类。
英文:
You import the ActionEvent from JavaFX. You need to import the swing class.
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