import java.io.File;
import java.io.IOException;
import java.util.Scanner;


public class Chap5prob14_fileDISPLAY {

		//data members
		// are the basic characteristics of the object
		private String filename;



		//method members
		//are the functionalities of the object

		//constructors    These methods create (instantiate) an instance of the object

	    /**
	     * Default constructor sets the filename to ""
	     */
	    public Chap5prob14_fileDISPLAY(){
	    	filename = "";

	    }

	    /**
	     * full constructor sets the filename according to the parameters
	     * @param filename is the filename
	     */
	    public Chap5prob14_fileDISPLAY(String filename){
	    	this.filename = filename;

	    }

		//getters

	    /**
	     * this method returns the filename
	     * @return the filename
	     */
	    public String getfilename(){
	    	return filename;
	    }



		//setters

	    /**
	     * This method resets the filename according to the parameter
	     * @param value will be set as the new value
	     */
	    public void setfilename( String value ) {
			this.filename = value;
		}


		//toString method

	    public String toString(){
	    	String str;

	    	str = ("\tThe file name you entered is: " + filename);
	    	return str;
	    }

	  //all other object specific methods

	  //file must be a .txt file, do not enter extension


        public StringBuffer displayHead() throws IOException {
    			File dataFile = new File(filename+".txt");
                Scanner input = new Scanner(dataFile);
                StringBuffer file = new StringBuffer("");
                double lineCount = 0;

            while(input.hasNextLine() && lineCount <= 4){
                    file.append(input.next() + "\n");

                    lineCount++;
            }

            return file;
        }

        public StringBuffer displayContents() throws IOException {
        		File dataFile = new File(filename+".txt");
        		Scanner input = new Scanner(dataFile);
        		StringBuffer file = new StringBuffer("");

        		while(input.hasNextLine()){
                      file.append(input.next() + "\n");
              }

              return file;

        }

        public StringBuffer displayWithLineNumbers() throws IOException {
    		File dataFile = new File(filename+".txt");
    		Scanner input = new Scanner(dataFile);
    		StringBuffer file = new StringBuffer("");
    		int i = 0;

    		while(input.hasNextLine()){
                  file.append(i + "\t" + input.next() + "\n");
                  i++;
          }

          return file;

    }

}//end class