How Do Variable Arguments (Varargs) Work in Java?

Variable Arguments in Java

In Java, the three dots (also known as varargs) following the parameter type, such as in the method below, signify variable arguments:

public void myMethod(String... strings) {
    // method body
}

Meaning

This means that you can pass zero or more String objects (or a single array of them) as arguments to the method. For instance, you can call the method as follows:

myMethod(); // Likely useless, but possible
myMethod("one", "two", "three");
myMethod("solo");
myMethod(new String[]{"a", "b", "c"});

Behavior

It's important to note that the arguments passed using varargs are always stored in an array. Even if there's only one argument, it's converted into an array. This behavior must be accommodated in the method body.

Limitations

The parameter that uses varargs must be the last parameter in the method signature. For example, the following method signature is valid:

myMethod(int i, String... strings)

However, the following method signature is invalid:

myMethod(String... strings, int i)

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