Web Reference: May 8, 2025 · 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. 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. You can use string concatenation to build sentences with both text and variables: String name = "John"; int age = 25; System.out.println("My name is " + name + " and I am " + age + " years old."); My name is John and I am 25 years old. You can also use the concat() method to concatenate strings:
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