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Integer Overflow

The loop : Inside Out Have a look at below code and guess what could be the output. public class Puzzle26  { public static final int END=Integer.MAX_VALUE; public static final int START=END-100; public static void main(String args[]) { int count = 0; for(int i=START;i<=END;i++) count++; System.out.println(count); } } At a first glance you might think this will print 100, off course because, END is 100 more than START. But look more carefully we are using less than equal to sign. So now you might guess it will print 101. Well, no. This program does not print a thing.  The reason is every integer is less than or equal to Integer.MAX_VALUE. And the moment our program increases Integer.MAX_VALUE there cannot be any value greater than that so it increments the variable i to  -2147483648 , which is the lowest integer value and then keeps incrementing it to  2147483647 i.e. the largest integer value and ...
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Character behaviour in Java

Today we will discuss some coding practices with characters and Strings. Can you guess the output of the below code: public static void main(String args[]) { String str="stark: 8"; String str2= "stark: "+str.length(); System.out.println("strings are equal "+str==str2); } Many people will think the output will be strings are equal true , well, its not because whenever we use "==" operator, it checks whether the references of the two strings are equal or not, it doesn't check if the values are equal or not. So now you might be thinking that the output will be  strings are equal false, again the output will be different, if you ran the program now you will see  false. It doesn't print strings are equal.  where's our string literal now ? Here the compiler will treat the statement as below: System.out.println(("strings are equal "+str)==str2); This performs the concatenation between strings are equa...
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