java : anonymous class

Question

In java this is valid

new Thread(new Runnable()
    {   
        public void run()
        {
            for(int i=0;i<5;i++)
                System.out.println("From anonymous:"+i);
        }
    }   
).start();

But this is not :

Thread t=new Thread(new Runnable()
    {   
        public void run()
        {
            for(int i=0;i<5;i++)
                System.out.println("From anonymous:"+i);
        }
    }   
).start();

can I achieve it with anonymous class? If yes then How

What you want to achieve exactly? start method just runs the thread. And run method does not return any value. — Rohit Jain
– Rohit Jain, Commented Nov 13, 2012 at 7:50

Ridcully · Accepted Answer · 2012-11-13 07:51:10Z

8

Your code does not work, because it wants to assign the result of the start() method to the variable t. You can do it like so:

Thread t=new Thread(new Runnable()
    {   
        public void run()
        {
            for(int i=0;i<5;i++)
                System.out.println("From anonymous:"+i);
        }
    }   
);
t.start();

answered Nov 13, 2012 at 7:51

Ridcully

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Comments

2010ad · Accepted Answer · 2012-11-13 08:45:56Z

3

Also, in this case you don't need to use Runnable interface because is implemented by the Thread class.

    new Thread() {
        @Override
        public void run() {
            for(int i=0;i<5;i++)
               System.out.println("From anonymous:"+i);
        }
    }.start();

answered Nov 13, 2012 at 8:45

2010ad

311 bronze badge

Comments

RNJ · Accepted Answer · 2012-11-13 09:04:44Z

1

One thing to note here is that the start method of Thread returns void. This is why you cannot assign it to a variable.

answered Nov 13, 2012 at 9:04

RNJ

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