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Tip: Using the String Concatenation Operator in Java

See how the plus symbol can be used as three distinct operators in Java.


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The + 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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Octavia Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
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