[JAVA] Timer 설정하기

// 자바에서 타이머를 설정하는 예제.

public class TimerExample
{
    public static void main(String[] args)
    {
        Timer timer1 = new Timer();
        Timer timer2 = new Timer();

        long period1 = 5 * 1000; // 5 seconds
        long period2 = 3 * 1000; // 3 seconds

        timer1.schedule(new Task("test1") , 0 , period1);
        timer2.schedule(new Task("test2") , 0 , period2);
    }
}

//////////// 아래는 TimerTask를 확장하는 Task 클래스

public class Task extends TimerTask
{
    private String m_name;

    public TimerTask(String name)
    {
        this.m_name = name;
    }

    public void run()
    {
        System.out.println(this.m_name);
    }
}

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• void java.util.Timer.schedule(TimerTask task , long delay , long period);

void java.util.Timer.schedule(TimerTask task, long delay, long period)

schedule

public void schedule(TimerTask task,
                     long delay,
                     long period)

Schedules the specified task for repeated fixed-delay execution, beginning after the specified delay. Subsequent executions take place at approximately regular intervals separated by the specified period.

In fixed-delay execution, each execution is scheduled relative to the actual execution time of the previous execution. If an execution is delayed for any reason (such as garbage collection or other background activity), subsequent executions will be delayed as well. In the long run, the frequency of execution will generally be slightly lower than the reciprocal of the specified period (assuming the system clock underlying Object.wait(long) is accurate).

Fixed-delay execution is appropriate for recurring activities that require "smoothness." In other words, it is appropriate for activities where it is more important to keep the frequency accurate in the short run than in the long run. This includes most animation tasks, such as blinking a cursor at regular intervals. It also includes tasks wherein regular activity is performed in response to human input, such as automatically repeating a character as long as a key is held down.

Parameters:

task - task to be scheduled.

delay - delay in milliseconds before task is to be executed.

period - time in milliseconds between successive task executions.

Throws:

IllegalArgumentException - if delay is negative, or delay + System.currentTimeMillis() is negative.

IllegalStateException - if task was already scheduled or cancelled, timer was cancelled, or timer thread terminated.

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