Can You Use Two Different Varargs in One Java Method?

How can I create a Java method that accepts two different varargs types?

public void doSomething(String[] s, int[] i) {
    // Implementation here
}

In Java, a method cannot have two varargs parameters of different types due to the way the compiler interprets the arguments during method invocation. This limitation arises from ambiguity when deciding which vararg should be matched against the provided arguments. However, there are alternative ways to design your method to achieve similar functionality using arrays or other techniques.

public void doSomething(String[] s, int[] i) {
    // Example implementation
    for (String str : s) {
        System.out.println(str);
    }
    for (int num : i) {
        System.out.println(num);
    }
}

Causes

• The Java Language Specification (JLS) states that varargs are syntactic sugar for arrays, and having more than one varargs parameter creates ambiguity.
• The compiler cannot determine which varargs should be used for a given argument list if both are specified.

Solutions

• Instead of using two varargs, define the method with two array parameters, like `String[] s` and `int[] i`.
• Consider using a single vararg that encompasses a common data structure, such as wrapping both types in a custom object or using a List to manage mixed data types.

Mistake: Trying to define two varargs in method signature.

Solution: Use two separate array parameters instead.

Mistake: Forgetting to check element types when processing mixed data in arrays.

Solution: Ensure type checks are placed correctly when processing each array.