The String Concatenation Operator in Java

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The arithmetic + operator that perform addition on numbers is also used as a concatenation operator in Java.

The operator concatenates Strings like this:

String s1 = "Hello", s2 = "World";

String newString = s1 + s2;

However, the operator doesn't just perform concatenations of strings, it can also concatenate numbers and objects, for example:

String s1 = "Hello ", s2 = " you ";

int i = 2;

String newString = s1 + i + s2 + i;

This translates the integer i to a string and it is concatenated with the s1 and s2 strings, forming a new string looking like:

Hello 2 you 2

If you need to make calculations during concatenation of strings, be sure to put them within parentheses:

String s1 = "Hello ", s2 = " you";

int i = 1;

String newString = s1 + (i + i) + s2; //would result in: Hello 2 you

If concatenating objects the method toString() of the base class java.lang.Object is called and the value returned is concatenated to the string.

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