Using the String Concatenation Operator in Java

The plus symbol can be used as three distinct operators in Java:

  • as the unary Plus operator, if there is no operand before the +
  • as the binary Addition operator, if there are two numeric operands
  • the binary Concatenation operator, if there are two operands, and at least one of them is a String

In a simple example, the Concatenation operator joins two strings to give a third string.

String s1 = "a String";String s2 = "This is " + s1; // s2 contains "This is a String"
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