{"id":4225,"date":"2019-05-10T13:26:20","date_gmt":"2019-05-10T17:26:20","guid":{"rendered":"http:\/\/springframework.guru\/?p=4225"},"modified":"2019-06-30T08:37:45","modified_gmt":"2019-06-30T12:37:45","slug":"java-timer","status":"publish","type":"post","link":"https:\/\/springframework.guru\/java-timer\/","title":{"rendered":"Java Timer"},"content":{"rendered":"

Timer<\/a> is a utility class as a facility for Threads to schedule tasks for future execution as a background thread. You can use this class to schedule tasks for one-time execution or for repeated execution at a regular interval.<\/p>\n

In this post, I\u2019ll explain how to schedule tasks in Java applications using the Timer<\/a> and TimerTask<\/a> classes.<\/p>\n

Timer and TimerTask<\/h2>\n

Timer<\/code> is used with TimerTask<\/code>, an abstract class which defines the task to be scheduled by Timer<\/code>. You need to extend TimerTask<\/code> to create a task that will be scheduled by Timer<\/code>. Java TimerTask<\/code> implements the Runnable<\/code> interface.<\/p>\n

Each of the TimerTask<\/code> is executed sequentially by a Timer<\/code> object which has a corresponding single background thread. TimerTask<\/code> objects should complete execution quickly. If a timer task takes too long to complete, it dominates the timer’s task execution thread, which in turn will delay the execution of the subsequent tasks. The tasks will finally accumulate into a queue.<\/p>\n

Note: Java Timer<\/code> object can be shared by multiple threads without any external synchronization.<\/p>\n

A TimerTask<\/code> object remains in one of the following states.<\/p>\n