Please explain the output from Thread run() and start() methods

Please explain the output of the below code:

If I call th1.run(), the output is:

EXTENDS RUN>>
RUNNABLE RUN>>

If I call th1.start(), the output is:

RUNNABLE RUN>>
EXTENDS RUN>>

Why this inconsistency? Please explain.

class ThreadExample extends Thread{
    public void run() {
        System.out.println("EXTENDS RUN>>");
    }
}

class ThreadExampleRunnable implements Runnable {
    public void run() {
        System.out.println("RUNNABLE RUN>>");
    }
}

class ThreadExampleMain{
    public static void main(String[] args) {
        ThreadExample th1 = new ThreadExample();
        //th1.start(); 
        th1.run();

        ThreadExampleRunnable th2 = new ThreadExampleRunnable();
        th2.run();
    }
}