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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
| Code: |
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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What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create
instance for its subclass only. By specifying abstract keyword just before
class, we can make a class as abstract class.
public abstract class MyAbstractClass{
}
Abstract class may or may not contains abstract methods. Abstract method is
just method signature, it does not containes any implementation. Its subclass
must provide implementation for abstract methods. Abstract methods are looks
like as given below:
public abstract int getLength();
I don’t know the key to success, but the key to failure is trying to please everybody.
-- Bill Cosby
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