Web Reference: 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. String Concatenation The + operator can be used between strings to combine them. This is called concatenation: 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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