Difference between

[Anu Charitha]

Thread t = new Thread(new MyRunnable());
Thread t1 = new Thread(new MyRunnable());

MyRunnable r = new MyRunnable();
Thread t = new Thread(r);
Thread t1 = new Thread(r);

Thanks for help in advance.

[Jeff Verdegan]

Hi, Anu, and welcome to the Ranch!

In the future, please UseAMeaningfulSubjectLine(⇐click).

As for your question, you can see for yourself what the difference is. In the first case, you have two MyRunnable objects and in the second case you only have one.

[Caleb Kemper]

Also, the first one declares two anonymous objects, while the second utilizes one that is referenced by a pointer variable, 'r'.
Use the first method if you're not going to be using those objects again. Use the second method if you are.

Example code (reading in an image):

BufferedImage img;
try{
      img = ImageIO.read(new File("nameOfFile"));
     }
catch (IOException e)
{
System.out.println("Could not read image file.");
}

Note that, because I only need to create a File object for the sole purpose of reading in the image, I use an anonymous object.
Otherwise, if the File were to have some future use, I would have created the File before, set it equal to a variable, and then used it in the read() method.

If you're not sure whether you're going to use an object again, it's best to simply assign it a pointer variable and play it safe.


Caleb