Web Reference: The + operator can be used between strings to combine them. This is called concatenation: Note that we have added an empty text (" ") to create a space between firstName and lastName on print. You can use string concatenation to build sentences with both text and variables: Sep 20, 2025 · The string concat () method concatenates (appends) a string to the end of another string. It returns the combined string. It is used for string concatenation in Java. It returns NullPointerException if any one of the strings is Null. Java provides a substantial number of methods and classes dedicated to concatenating Strings. In this tutorial, we’ll dive into several of them as well as outline some common pitfalls and bad practices.
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