用Java編寫的計時器，有三按鈕。開始，停止，復(fù)位。問題出在：按下復(fù)位后再按開始，還是從按下停止的時間開始計時。請問下應(yīng)該怎么改寫代碼，使得按下開始就是從0計時。代碼如下：
import?java.awt.Button;
import?java.awt.Color;
import?java.awt.FlowLayout;
import?java.awt.PopupMenu;
import?java.awt.TextField;
import?java.awt.event.ActionEvent;
import?java.awt.event.ActionListener;
import?java.text.SimpleDateFormat;
import?java.util.Calendar;
import?java.util.Date;
import?javax.swing.JFrame;
import?javax.swing.JLabel;
import?javax.swing.Timer;
public?class?TimeCount?extends?JFrame?{
JLabel?lbl?=?new?JLabel();
Date?now?=?new?Date();
public?TimeCount()?{
now.setHours(0);
now.setMinutes(0);
now.setSeconds(0);
final?Timer?timer?=?new?Timer(1000,?new?ActionListener()?{
public?void?actionPerformed(ActionEvent?e)?{
Date?now2?=?new?Date(now.getTime()?+?1000);
now?=?now2;
SimpleDateFormat?formatter?=?new?SimpleDateFormat("HH:mm:ss");
lbl.setText(formatter.format(now));
}
});
Button?b1?=?new?Button("開始計時");
Button?b2?=?new?Button("停止計時");
Button?b3?=?new?Button("復(fù)位");
b1.setSize(100,?50);
b2.setSize(100,?50);
b3.setSize(100,?50);
b1.addActionListener(new?ActionListener()?{
@Override
public?void?actionPerformed(ActionEvent?e)?{
Button?b?=?(Button)?e.getSource();
b.setLabel("開始計時");
timer.start();
}
});
b2.addActionListener(new?ActionListener()?{
@Override
public?void?actionPerformed(ActionEvent?e)?{
Button?b?=?(Button)?e.getSource();
b.setLabel("停止計時");
timer.stop();
}
});
b3.addActionListener(new?ActionListener()?{
@Override
public?void?actionPerformed(ActionEvent?e)?{
lbl.setText("00:00:00");
}
});
this.setLayout(new?FlowLayout());
//this.add(txt);
this.add(b1);
this.add(b2);
this.add(b3);
this.add(lbl);
this.setSize(300,?200);
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public?static?void?main(String[]?args)?{
TimeCount?t?=?new?TimeCount();
}
}
添加回答
舉報
0/150
提交
取消