[Java] упростить/укоротить код

package statistics;

import java.text.DecimalFormat;
import java.util.Scanner;
import java.lang.String;
import ui.StaafDiagramUserInterface; // интрфейс диаграммы
import ui.UserInterfaceFactory;
import ui.UIHulpMethodes;

class Statistics {
	
	UIHulpMethodes hlp;
	StaafDiagramUserInterface sd;
	
	int aantalStaven, lineLength, numberOfColumns, indexOfColumn;
	
	Statistics() {
		
		Scanner rangeOfDiagram = new Scanner(System.in); 
		System.out.printf("Количество колонок: ");
		numberOfColumns = rangeOfDiagram.nextInt(); 
		aantalStaven = numberOfColumns; // aantalStaven - число колонок - заданная в интерфейсе диаграммы переменная
		
		sd = UserInterfaceFactory.geefStaafDiagramUI(aantalStaven);
		UIHulpMethodes.vraagGebruikerOmInvoer(); // спросить пользователя файл
	}
	
	void parseLine(String readLine) { 
		Scanner readNextScanner = new Scanner(readLine);
		 												
		for (int i = 0; i < readLine.length(); i++) { 
									//read length of line 
			lineLength = i;	
		}
		
		if (lineLength < 7) {
			String yearsAndStudies = readNextScanner.next();
			Scanner readYearsAndStudiesScanner = new Scanner(yearsAndStudies);
			
			readYearsAndStudies(readYearsAndStudiesScanner);
			
		} 
		else { 	// if line is longer than 7 read it and divide names and game results
			readNextScanner.useDelimiter("\t");
					
			String studentNames = readNextScanner.next();
		
			String gameResults = readNextScanner.next();
			Scanner gameResultsScanner = new Scanner(gameResults);
					
			sortPercentagesIntoColumns(gameResultsScanner); // then call function to sort percentages;
		}
	}
	
	
	void readYearsAndStudies(Scanner readYearsAndStudiesScanner) {
		
		String readYearsAndStudies = readYearsAndStudiesScanner.next();
		
		if (readYearsAndStudies.matches("-")) {
			String years = readYearsAndStudiesScanner.next();
		} 
		else if (readYearsAndStudies.matches("I")) {
			String study = "I";
		} 
		else if (readYearsAndStudies.matches("=")) {
			String study = readYearsAndStudiesScanner.next();
		}
	}
	
	
	void sortPercentagesIntoColumns(Scanner gameResultsScanner) {
		
		String averageWaittime = gameResultsScanner.next(); 	 
		String percentageOfStones = gameResultsScanner.next();
		
		int currentPercentage = Integer.parseInt(percentageOfStones); // parse percentages to type int;
		// here are defined two variables which calculate "size" of columns in diagram by division of 100;  
		double step = 100.0 / numberOfColumns;  
		double adder = 100.0 / numberOfColumns;  
		indexOfColumn = 0;					
								// this part of function "walks" through all columns
								// in order to decide which index of column to increase; 
		while (step < currentPercentage) {	// so, while step is lower than a given percentage 
			step += adder;					// it increases variable "step" by "adder" and "steps"
			indexOfColumn++;				// to the next column;
		}
		
		if (indexOfColumn == numberOfColumns) { // if loop stepped over the last column
			indexOfColumn--;					// add index to this last column;
		}
		
		sd.verhoogStaaf(indexOfColumn); // добавить один к колонке
	}

	void start() {
		Scanner in = new Scanner(System.in); 
		
		while(in.hasNext()) {
			String readLine = in.nextLine();
			
			parseLine(readLine);
		}
		
		// variables to create an array of strings (names of columns);
		double adder = 100.0 / numberOfColumns;
		double from = 0;                     // every column has a name of "from" and "to" in percentages;
		double to = 100.0 / numberOfColumns - 1; // -1 here because names should be in format 0-9% , 10-19%, etc..
		
		DecimalFormat df = new DecimalFormat("#.#"); 
		
		for (indexOfColumn = 0; indexOfColumn < numberOfColumns; indexOfColumn++) {
			if (indexOfColumn == numberOfColumns - 1) { 
			to = 100; // if it's on the last column, assign "to" to 100%;
			} 

			sd.geefStaafNaam(indexOfColumn, df.format(from) + "-" + df.format(to) + "%");
			sd.zetLaatNamenZien(true);
			sd.toon();
			from += adder; // use "adder" "to walk" through array;
			to += adder; 
		}
	}

public static void main(String[] argv) {
	new Statistics().start();
	}
}