Setting a threads priority can be very useful if one thread has more critical tasks to perform than another.
The Thread class has a method called setPriority(int level) with which you can alter the priority a Thread instance has.
The priority level range from 1 (least important) to 10 (most important) and if no level is explicitly set, a Thread instance has the priority level of 5.
In the first example below no priorites are set, so both threads have the priority level 5. The TestThread class implements the Runnable interface and in its
run() method loops from 1 to 10 and output the number along with its Thread id, which is passed to the constructor.
public class Main {
public void setPrioritiesOnThreads() {
Thread thread1 = new Thread(new TestThread(1));
Thread thread2 = new Thread(new TestThread(2));
thread1.start();
thread2.start();
try {
thread1.join();
thread2.join();
} catch (InterruptedException ex) {
ex.printStackTrace();
}
System.out.println("Done.");
}
public static void main(String[] args) {
new Main().setPrioritiesOnThreads();
}
class TestThread implements Runnable {
int id;
public TestThread(int id) {
this.id = id;
}
public void run() {
for (int i = 1; i <= 10; i++) {
System.out.println("Thread" + id + ": " + i);
}
}
}
}
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