Java String concatenation - How to combine two Strings

Java String FAQ: How do I merge/combine two Java String fields?

You can merge/concatenate/combine two Java String fields using the + operator, as shown in this example code:

// define two strings
String firstName = "Fred";
String lastName  = "Flinstone";

// concatenate the strings
String fullName  = firstName + lastName;

The String fullName now contains "FredFlinstone". Note that there is no space between "Fred" and "Flinstone" because I didn’t put a space in there.

One way to add a space to the new string is to put one in there, as shown in this example:

String firstName = "Fred";
String lastName  = "Flinstone";
String fullName  = firstName + " " + lastName;

In that example, I’m combining/merging three Java Strings in that last line of code.

Java String concatenation - Summary

I hope these Java String concatenation examples have been helpful. As you can see, for simple string concatenation operations you can just add Java Strings together using the + operator. But as an important note, if you’re going to be adding a lot of Java String objects together, it’s much more efficient to use the Java StringBuffer class. Just search this site for "Java StringBuffer" to find more String concatenation examples.

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