在java swing中创建数字时钟项目时发生语法错误[已关闭]

Question

编辑问题以包括所需的行为、特定问题或错误以及重现问题所需的最短代码。这将帮助其他人回答问题。

“displayClock”最后一行第二行出现语法错误。请帮我解决这个错误。我是否需要添加任何软件包或安装库软件包？

import java.awt.event.*; import java.text.DateFormat; import java.text.SimpleDateFormat; import javax.swing.Timer; import java.util.Date;

public class ClockJFrame extends javax.swing.JFrame {

Timer updateTimer;
int DELAY =100;


public ClockJFrame(){
    initComponents();

    updateTimer = new Timer(DELAY, new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            Date currentTime = new Date();
            String formatTimeStr= "hh:mm:ss a";
            DateFormat formatTime = new SimpleDateFormat(formatTimeStr);
            String formatedTimeStr =formatTime.format(currentTime);

            displayClock.setText(formatedTimeStr);
        }
    });


    updateTimer.start();

}

Answer 1

我想你正在寻找这样的东西：

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.Timer;

public class ClockJFrame extends JFrame {

    private Timer updateTimer = null;
    private int DELAY = 1000;
    private JLabel label = null;

    public ClockJFrame(){

        updateTimer = new Timer(DELAY, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                Date currentTime = new Date();
                String formatTimeStr= "hh:mm:ss a";
                DateFormat formatTime = new SimpleDateFormat(formatTimeStr);
                String formatedTimeStr =formatTime.format(currentTime);
                addText(formatedTimeStr);
            }
        });
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null); // this method display the JFrame to center position of a screen
        setVisible(true);

        updateTimer.start();
    }

    private void addText( String txt ) {
        if ( label == null )
            label = new JLabel("", SwingConstants.CENTER);
        label.setText(txt);
        add(label);
    }

    public static void main( String [] args ) {
        ClockJFrame c = new ClockJFrame();
    }
}

您还可以查看此网站：https://www.tutorialspoint.com/how-to-display-a-jframe-to-the-center-of-a-screen-in-java.