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please explain the program  RSS feed

 
Ranch Hand
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When i run this program i found the output is:-

0.0
0.0
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5
at Foo.main(Foo.java:10)
Press any key to continue . . .
please explain me why it is

0.0
0.0
and exception
 
Rancher
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"j" is incremented twice in each loop iteration. You might want to print out the value of j before and after the "x[j]=j++" statement to see how its value changes.
 
Sheriff
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x[j]=j++ assigns the current value of j to x[j], then increments it. So, if the other increment would be absent, it would result in an array of [0, 1, 2, 3, 4].
Also, after this increment, you're trying to access x[j] again.

So what is happening:
x[0] = 0;
j = 1;
x[1] is printed (0 because not initialized)
j = 2 (loop increment)
x[2] = 2;
j = 3;
x[3] is printed (0 not initialized)
j = 4 (loop increment)
x[4] = 4;
j = 6;
x[5] is printed -> ArrayIndexOutOfBoundsException
 
Ashok Pradhan
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Thanks Rob and Dittmer for your Explaination
 
It is sorta covered in the JavaRanch Style Guide.
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