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# (Method)Overloading

* **Condition**

1. Same method name
2. Same number and type of parameter
3. Same return type

```java
long add(int a, long b) {return a+b;}
long add(long a, long b) {return a+b;}
```

```java
//same type of parameter : duplicated. error
long add(int a, long b) {return a+b;}
long add(long a, int b) {return a+b;}

add(3,3L);
add(3L,3);

//ambiguous error. not clear that call first or second.
add(3,3);
```

```java
//different return type. error
int add(int a, int b) {return a+b;}
long add(long a, long b) {return a+b;}
```

* overloading example : different parameter, same function => method name : verb. ex) add, println, round, random...

: println(int), println(char), println(...)