What Does the '...' (Ellipsis) Mean in Java Method Parameters?

Understanding the Significance of the 3 Dots in Java Parameters

In Java, the three dots (...) next to a parameter type, known as the varargs syntax, signify that the corresponding argument can accept zero or more values of the specified type. This provides flexibility in method signatures, allowing for a variable number of arguments in various scenarios.

For instance, consider the following method:

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

Here, the "strings" parameter is declared as a varargs parameter. This means that the method can be called with zero or more String arguments. For example:

• myMethod(); (no arguments)
• myMethod("one", "two", "three"); (three arguments)
• myMethod("solo"); (one argument)

It's important to note that the varargs parameter must always be the last parameter in the method signature. So, myMethod(int i, String... strings) is valid, but myMethod(String... strings, int i) is not.

When calling a method with a varargs parameter, the arguments are treated as an array. Therefore, within the method body, you should access the arguments as an array.

By incorporating varargs parameters in Java methods, developers can create versatile methods that handle varying numbers of arguments, providing flexibility and adaptability in code design.

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