Question

Which of this method of class String is used to obtain a length of String object?

What is the output of the below Java program with WHILE, BREAK and CONTINUE?

int cnt=0;

while(true)

{

if(cnt > 4)

   break;

  

if(cnt==0)

{

    cnt++;

continue;

}

  System.out.print(cnt + ",");

  cnt++;

}

1,2,3,4
		Compiler error
		0,1,2,3,4,
		1,2,3,4,

Answer 1

Step1:

First of We should be clear with break,continue,and while statements:

while: while is used to iterate again and again over the statements till the condition is true

break: break is used to break the loop and comes out from the loop without executing the remaining statements .

continue: Using this statements curser  will jump to start of the loop without executing the remaining statements.

Step2:

Now Given code is:

  int cnt=0;
        while(true)
       {
          if(cnt > 4)
          break;
          if(cnt==0)
          {
            cnt++;
            continue;
          }
            System.out.print(cnt + ",");
           cnt++;
        }

Step3:

Here cnt is 0 initially

while will try to execute infinitely because true is passed as condition which will always be true

Now here one if condition is there which will break the loop:

if(cnt > 4)
break;

It means when cnt value will gets greater then 4 it will comes out of the loop .

Now we have one more condition is there

 if(cnt==0)
  {
     cnt++;
     continue;
   }

it will run only when cnt is equal to zero it means it will execute first time and increment cnt by 1 and jump to the start of the loop

After that we have

 System.out.print(cnt + ",");
           cnt++;

it will print cnt and a comma ( , )

so Code execution will go like this ..

firstly cnt is 0 so it will come inside second if condition and gets increment by 1 and jump to start of the loop without printing .

next time cnt will be 1 so it will not go in any if condition and 1, will gets printed similarly 2,3,4, gets printed in subsquent iteration .

Now when cnt will be equal to 5 it will gets into the first if condiion and break statements gets executed so it will comes out of the loop .

Output:

so final Output  will be 1,2,3,4,  

Please note that there will be a , at last of the output.

So third option is correct

Thanks