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Java Puzzles Green = Easy, Blue = Normal, Red = Hard Select 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 By title |
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Questions:
1. What is the output of the following code?
2. What is the output if you replace the return; statement with the break; statement?
3. What is the output if you replace the return; statement with the continue; statement?
Java puzzle 25: The difference between return, break and continue
Level: Normal
public class MyClass
{
static int count = 0;
void print()
{
int[] numbers = {2, 3, 4};
outer:for(int x: numbers)
{
count++;
inner:for(int n = 0; n < 5; n++)
{
count++;
return;
// break;
// continue;
}
}
}
public static void main(String[] args)
{
new MyClass().print();
System.out.print(count);
}
}
Author: Sar Maroof
Answer explanation
The outer loop is repeated 3 times, because there are three elements in the array.
- return:
When the return statement is reached, the execution of the method print is terminated.
By using the return statement the outer loop is executed once, and the inner loop is also executed once. That is because at the first execution of the inner loop the return statement is reached. - break: By using the the break lable, the outer loop is executed three times, but the inner loop is terminated each time when the break statement is reached.
So, count = 3 (outer loop) + 1 x 3 (inner loop) = 6. - continue: By using the continue statement the outer loop is executed 3 times and by each execution of the outer loop the inner loop is executed 5 times.
So, count = 3 (outer loop) + 5 x 3 (inner loop) = 18.
The correct answer is:
1. 2.
2. 6.
3. 18.
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Sar Maroof is a professional software development teacher, gives master classes and publishes technical articles. He is also an expert software developer and worked for several big as well as small companies and later as a freelancer. |
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