It is illegal for a class to declare two methods with the same signature. : Method « Java Source And Data Type « SCJP

1. SCJP
2. Java Source And Data Type
3. Method

A method's signature consists of the method name and 
the sequence of types used to declare the method's parameters. 


public class MainClass {
  public static void main(String[] argv) {
    System.out.println();
  }

  public int main(String[] argv) {
    System.out.println();
  }

}

Duplicate method main(String[]) in type MainClass