Select the correct method that can overload the following method.

public int addKey(String s, int i);

Question

Select the correct method that can overload the following method.

public int addKey(String s, int i);

BlackTom AI · Accepted Answer

Method overloading in Java is determined by the method signature: method name plus the ordered list of parameter types. Return type and parameter names do not form part of the signature, so changing only the return type or only parameter names does not create an overload. Access modifiers and declared exceptions also do not affect overloading.

1) Relevant knowledge points and concepts
- A method signature = method name + parameter types (in order).
- Overloading requires a different signature (different number of parameters, different parameter types, or different order of parameter types).
- Changing only the return type or only the parameter names is not enough to overload a method.
- The compiler resolves overloaded methods at compile time based on the parameter list.

2) Step-by-step reasoning process
- Original method: public int addKey(String s, int i)
  Signature: addKey(String, int)
- Evaluate each option by comparing its parameter list to the original signature.

3) Comparison of options (intermediate steps)
- Option A: public void addKey(String s, int i)
  Parameter list: (String, int) — identical to original. Only return type differs (int → void). Not a valid overload.
- Option B: public int addKey(String s, int k)
  Parameter list: (String, int) — identical. Parameter name change (i → k) does not affect signature. Not an overload.
- Option C: public String addKey(String s, int i)
  Parameter list: (String, int) — identical. Only return type differs (int → String). Not an overload.
- Option D: public int addKey(int i, String s)
  Parameter list: (int, String) — different order of parameter types compared to original (String, int). This produces a different signature and is a valid overload.

4) Why the correct answer is correct
Option D changes the parameter types order, producing a distinct signature addKey(int, String). That satisfies Java’s rules for overloading; the compiler will treat both methods as separate and resolve calls by matching parameter types and order.

5) Why the other options are incorrect
- A and C: same parameter list as original; only return type changes — return type cannot be used to overload.
- B: parameter names changed but parameter types/order unchanged — names do not affect the signature.

6) Conclusion
The correct overloaded method is public int addKey(int i, String s); This matches the provided answer.

Select the correct method that can overload the following method. public int addKey(String s, int i);单项选择题

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