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Class declaration with a method that has a parameter

public class MainClass {    public static void main( String args[] )    {        GradeBook myGradeBook = new GradeBook();        String courseName = "Java ";       myGradeBook.displayMessage( courseName );    } } class GradeBook {    public void displayMessage( String courseName )    {       System.out.printf( "Welcome to the grade book for\n%s!\n",           courseName );    } } Welcome to the grade book for Java !