A class without a properly defined main() method may be executed directly. code example

Example 1: run a java class without main method

//This is prior to Java 7
class StaticInitializationBlock{
   static{
      System.out.println("class without a main method");
      System.exit(0);
   }
}

Example 2: Can we execute a program without main() method

Yes, one of the ways to execute the program without the main method is 
 using static block
 
 What if the static modifier is removed from the signature of the main method??
 
 Program compiles. However, at runtime, It throws an error "NoSuchMethodError