How to Use Operators with Strings in Java Programming

February 26, 2014 , , , 0 Comments

Operator + with strings

You have used the operator + with numbers. When you use + with numbers, the result is also a number. However, if you use operator + with strings, it concatenates them e.g.

5 + 6 results in to 11.
“5” + “6” results in to “56”.
“17” + “A, V. Vihar” result in to “17 A, V. Vihar”
“abc” + “123” results in to “abc 123”
“” + 5 + “xyz” results in to “5xyz”
“” + 5 results in to “5”

(In above two expressions Java would internally convert 5 in to “5” first and then concatenate with “xyz” and “” respectively.)

Increment/Decrement Operators (++, --)

Java includes two useful operators not generally found in other computer languages (expect C and C++). These are the increment and decrement operators, ++ and --. The operators ++ adds 1 to its operand, and – subtracts one.
In other words,
a = a + 1;
is the same as
++a ; or a++;
a = a – 1
is the same as
--a ; or a --;

However, both the increment and decrements come in to two varieties: they may either precede of=r fallow the operand. The prefix version comes before the operand (as in ++ a or -- a) and the post-fix version comes after the operand (as in a++ or a--). The two version have the same effect upon the operand, but they differ when they take place in an expression.

Anil Swami

Some say he’s half man half fish, others say he’s more of a seventy/thirty split. Either way he’s a fishy bastard. Google