Declear a class with one method

public class MainClass
{
public static void main( String args[] ) //main
{
GradeBook myGradeBook = new GradeBook(); //new for allocation memory

myGradeBook.displayMessage(); //calling of a method.
}
}

class GradeBook
{
public void displayMessage()
{
System.out.println (" Welcome to the Grade Book...");
}

public class MainClass
{
public static void main( String args[] )
{
GradeBook myGradeBook = new GradeBook();

myGradeBook.displayMessage();
}
}

class GradeBook
{
public void displayMessage()
{
System.out.println( "Welcome to the Grade Book!" );
}

}



}