[英]How to update time elapsed
I'm developing a program which will count the time until the button is clicked I'm having trouble with using Timer. 我正在开发一个程序,该程序将计算单击按钮之前的时间,但我无法使用Timer。 I wanted to have something like 00:00:00 -> 00:00:01 -> 00:00:02 ... etc my problem is that
我想要像00:00:00-> 00:00:01-> 00:00:02 ...
it is stuck in 00:00:01 它卡在00:00:01
here's my code 这是我的代码
Timer timer=new Timer(1000,null);
JLabel time=new JLabel("00:00:00");
timer.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
DecimalFormat df=new DecimalFormat("00");
int h=0;
int m=0;
int s=0;
s++;
if(s==60)
{
m++;
if(m==60)
{
h++;
}
}
time.setText(df.format(h)+":"+df.format(m)+":"+df.format(s));
revalidate();
repaint();
}
});
timer.start();
You've declared your variables as local variables within the context of the ActionListener
... 您已经在
ActionListener
的上下文中将变量声明为局部变量。
@Override
public void actionPerformed(ActionEvent e)
{
DecimalFormat df=new DecimalFormat("00");
int h=0;
int m=0;
int s=0;
This means that each time actionPerformed
the variables are reset to 0
... 这意味着每次将
actionPerformed
变量重置为0
...
Try making them instance variables instead... 尝试使它们成为实例变量...
You're also not resetting the variables when they pass their limits, for example... 例如,当变量超过限制时,您也不会重置它们。
s++;
if (s >= 60) {
s = 0;
m++;
if (m >= 60) {
h++;
m = 0;
}
}
As an alternative, you could maintain a single counter, which acts as the number of seconds that have passed and use some module mathematics to calculate the time parts 或者,您可以维护一个计数器,该计数器用作已过去的秒数,并使用一些模块数学来计算时间部分
private int count = 0;
//...
Timer timer = new Timer(1000, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
count++;
int hours = count / (60 * 60);
float remainder = count % (60 * 60);
float mins = remainder / (60);
remainder = remainder % (60);
float seconds = remainder;
DecimalFormat df=new DecimalFormat("00");
time.setText(df.format(hours) + ":" + df.format(mins) + ":" + df.format(seconds));
}
});
timer.start();
This makes it a little simpler in the fact that you are managing a single value and then deciding how best to format it, rather then managing three states...IMHO 这使得您管理单个值,然后决定如何最好地设置其格式,而不是管理三个状态,这一点使事情变得更加简单。
If I understand you, you should first store the startTime - 如果我了解您,则应首先存储startTime-
final long startTime = System.currentTimeMillis();
Then use it to calculate your time fields in actionPerformed()
, 然后使用它来计算
actionPerformed()
时间字段,
DecimalFormat df = new DecimalFormat("00");
long endTime = System.currentTimeMillis();
long diff = endTime - startTime;
int h = (int) (diff) / (60*60*1000);
diff -= h * (60*60*1000);
int m = (int) (endTime-startTime) / (60*1000);
diff -= m * (60 * 1000);
int s = (int) (diff / 1000);
time.setText(df.format(h) + ":" + df.format(m)
+ ":" + df.format(s));
revalidate();
repaint();
Edit 编辑
Based on your new requirements, 根据您的新要求,
Replace 更换
final long startTime = System.currentTimeMillis();
with 同
final Calendar startTime = Calendar.getInstance();
and then 接着
DecimalFormat df = new DecimalFormat("00");
long endTime = System.currentTimeMillis();
long diff = endTime - startTime.getTimeInMillis();
int h = (int) (diff) / (60 * 60 * 1000);
diff -= h * (60 * 60 * 1000);
int m = (int) (endTime - startTime.getTimeInMillis()) / (60 * 1000);
diff -= m * (60 * 1000);
int s = (int) (diff / 1000);
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