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Java Thread By Implementing Runnable Interface
- A Thread can be created by extending Thread class also. But Java allows only one class to extend, it wont allow multiple inheritance. So it is always better to create a thread by implementing Runnable interface. Java allows you to impliment multiple interfaces at a time.
- By implementing Runnable interface, you need to provide implementation for run() method.
- To run this implementation class, create a Thread object, pass Runnable implementation class object to its constructor. Call start() method on thread class to start executing run() method.
- Implementing Runnable interface does not create a Thread object, it only defines an entry point for threads in your object. It allows you to pass the object to the Thread(Runnable implementation) constructor.
Thread Sample Code
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package com.myjava.threads;
class MyRunnableThread implements Runnable{
public static int myCount = 0;
public MyRunnableThread(){
}
public void run() {
while(MyRunnableThread.myCount <= 10){
try{
System.out.println("Expl Thread: "+(++MyRunnableThread.myCount));
Thread.sleep(100);
} catch (InterruptedException iex) {
System.out.println("Exception in thread: "+iex.getMessage());
}
}
}
}
public class RunMyThread {
public static void main(String a[]){
System.out.println("Starting Main Thread...");
MyRunnableThread mrt = new MyRunnableThread();
Thread t = new Thread(mrt);
t.start();
while(MyRunnableThread.myCount <= 10){
try{
System.out.println("Main Thread: "+(++MyRunnableThread.myCount));
Thread.sleep(100);
} catch (InterruptedException iex){
System.out.println("Exception in main thread: "+iex.getMessage());
}
}
System.out.println("End of Main Thread...");
}
}
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Example Output
Starting Main Thread...
Main Thread: 1
Expl Thread: 2
Main Thread: 3
Expl Thread: 4
Main Thread: 5
Expl Thread: 6
Main Thread: 7
Expl Thread: 8
Main Thread: 9
Expl Thread: 10
Main Thread: 11
End of Main Thread...
Other Thread Examples
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Can interface be final?
No. We can not instantiate interfaces, so in order to make interfaces
useful we must create subclasses. The final keyword makes a class unable
to be extended.
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
-- William Arthur Ward
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