Javaセミナー2014/阪口政徳のバックアップ(No.13)

[20141213宿題]

import java.io.*;
import java.lang.*;
import java.math.*;
import java.util.regex.PatternSyntaxException;
import java.util.regex.*;

enum DigitStatus {
   fractionOnlyNG, OK, NG 
}

public class Calc {
  static String currentData = "";
  static String currentOperator = "+";
  static BigDecimal currentResult = new BigDecimal(0);
  static boolean isNotEndOfWhile = true;
  static BufferedReader br = null;

  /*定数*/
  static final int MAX_DIGIT = 15;
  static final String START_COMMENT = "計算機アプリを開始します。";
  static final String NUMBER_INPUT_COMMENT = "数字を入力してください:";
  static final String NUMBER_Operator_Q_INPUT_COMMENT = "数字・演算子・qを入力してください。";
  static final String NUMBER_Operator_Q_INPUT_COMMENT_FOR_DIVIDE = "0以外の数字・演算子・qを入力してください。";
  static final String SITEIKETASU_COMMENT = "最大桁数";
  static final String OVER_COMMENT = "をオーバーしています。";
  static final String SAIDO_INPUT_COMMENT = "もう1度入力してください。";
  static final String END_COMMENT = "計算機アプリを終了します。";
  static final String RESET_COMMENT = "値をリセットしました。";
  static final String Operator_CHANGE_COMMENT = "演算子を変更します。";
  static final String ZERO_DIVIDE_COMMENT = "0で除算しようとしました。";

  public static void main (String[] args) throws IOException, NumberFormatException {
    
    try {
      br = new BufferedReader(new InputStreamReader(System.in));
      System.out.println(START_COMMENT);
      System.out.print(NUMBER_INPUT_COMMENT);
      currentData = br.readLine();
      currentData = currentData.trim();
      while (isNotEndOfWhile) {
        makeValidation();
      }
    } catch (IOException iEx) {
      System.out.println(iEx.toString());
    } catch (NumberFormatException nEx) {
      System.out.println(nEx.toString());
    } catch (ArithmeticException aEx) {
      System.out.println(aEx.toString());
    } catch (PatternSyntaxException pEx) {
      System.out.println(pEx.toString());
    } finally {
      if (br != null) {
        br.close();
      }
    }
  }

  private static void makeValidation()
  throws NumberFormatException, IOException,
         ArithmeticException, PatternSyntaxException {
    if (currentData == null || currentData.isEmpty()) {
      System.out.println(NUMBER_Operator_Q_INPUT_COMMENT);
      readLineInputData();
    } else if (currentData.matches("^[qQ]$")) {
      System.out.print(END_COMMENT);
      isNotEndOfWhile = false;
      return;
    } else if (currentData.matches("^\\=$")) {
      System.out.println("= " + currentResult.toPlainString());
      currentResult = new BigDecimal(0.0);//値のリセット
      currentOperator = "+";
      readLineInputData();
    } else if (currentData.matches("^[\\+\\-]?\\d+(\\.\\d+)?$")) {
      calculate();
      readLineInputData();
    } else if (currentData.matches("^[\\+\\-\\*/]$")){
      currentOperator = currentData;
      readLineInputData();
    } else {
      System.out.println(NUMBER_Operator_Q_INPUT_COMMENT);
      readLineInputData();
    }
  }

  private static void readLineInputData() throws IOException{
    System.out.print(currentResult.toPlainString() + " " + currentOperator + " ");
    currentData = br.readLine();
    currentData = currentData.trim();
  }

  private static DigitStatus isDigitAvialable (String examData) {
    BigDecimal bigDecimalExamData = new BigDecimal(examData);
    String strBDExamData = bigDecimalExamData.toPlainString().replaceFirst("[\\+\\-]", "");

    int totalLength    = strBDExamData.length();
    int integerLength  = strBDExamData.indexOf(".") == -1 ? totalLength : strBDExamData.indexOf(".");
    int fractionLength = strBDExamData.indexOf(".") == -1 ? 0           : totalLength - integerLength - 1;

    if (integerLength <= MAX_DIGIT && fractionLength <=  MAX_DIGIT) {
      return DigitStatus.OK;
    } else {
      System.out.println(SITEIKETASU_COMMENT + "(" + MAX_DIGIT + ")" + OVER_COMMENT);
      System.out.println(SAIDO_INPUT_COMMENT);
      return DigitStatus.NG;
    }
  }

  private static DigitStatus isfractionDigitOnlyAvialable (String examData) {
    BigDecimal bigDecimalExamData = new BigDecimal(examData);
    String strBDExamData = bigDecimalExamData.toPlainString().replaceFirst("[\\+\\-]", "");

    int totalLength    = strBDExamData.length();
    int integerLength  = 0;
    int fractionLength = 0;

    integerLength  = strBDExamData.indexOf(".") == -1 ? totalLength : strBDExamData.indexOf(".");
    fractionLength = strBDExamData.indexOf(".") == -1 ? 0           : totalLength - integerLength - 1;

    if (integerLength <= MAX_DIGIT && fractionLength >  MAX_DIGIT) {
      return DigitStatus.fractionOnlyNG;
    } else {
      return DigitStatus.OK;
    }
  }
   private static void calculate ()
  throws NumberFormatException, IOException, ArithmeticException{
    BigDecimal temp_currentResult =  currentResult;
    BigDecimal bigDecimalCurrentData = new BigDecimal(currentData);

    if (isDigitAvialable(currentData) == DigitStatus.NG){
      return;
    }

    switch (currentOperator.charAt(0)){
      case '+':
        temp_currentResult = currentResult.add(bigDecimalCurrentData);
        break;
      case '-':
        temp_currentResult = currentResult.subtract(bigDecimalCurrentData);
        break;
      case '*':
        temp_currentResult = currentResult.multiply(bigDecimalCurrentData);
        if (isfractionDigitOnlyAvialable(temp_currentResult.toPlainString()) == DigitStatus.fractionOnlyNG) {
          System.out.println("実計算結果:" + temp_currentResult.toPlainString());
          System.out.println("四捨五入を実行して指定桁(" + MAX_DIGIT + ")にします:");
          temp_currentResult = currentResult.multiply(bigDecimalCurrentData);
          temp_currentResult = temp_currentResult.setScale(MAX_DIGIT, BigDecimal.ROUND_HALF_UP);
        }
        break;
      case '/':
        Double doubleCurrentData = Double.parseDouble(currentData);
        if (doubleCurrentData == 0) {
          System.out.println(NUMBER_Operator_Q_INPUT_COMMENT_FOR_DIVIDE);
          return;
        } else {
          try{
            temp_currentResult = currentResult.divide(bigDecimalCurrentData);
            if (isfractionDigitOnlyAvialable(temp_currentResult.toPlainString()) == DigitStatus.fractionOnlyNG) {
              System.out.println("実計算結果:" + temp_currentResult.toPlainString());
              System.out.println("四捨五入を実行して指定桁(" + MAX_DIGIT + ")にします:");
              temp_currentResult = currentResult.divide(bigDecimalCurrentData,
                                                   MAX_DIGIT ,
                                                   BigDecimal.ROUND_HALF_UP);
            }
          } catch(ArithmeticException aEx) {
            temp_currentResult = currentResult.divide(bigDecimalCurrentData,
                                                 MAX_DIGIT ,
                                                 BigDecimal.ROUND_HALF_UP);
          }
        }
        break;
      default:
        throw new IOException();
    }
    if (isDigitAvialable(temp_currentResult.toPlainString()) == DigitStatus.OK) {
      currentResult = temp_currentResult;
    }
  }
}

[宿題20141216]先生のお手本を参考に、20141221パフォーマンス修正。まだprimeSet有効活用できず(primeSetオブジェクトの保存読込未着手・ループ変数の選択改良未着手)。 2014122primeSet.addの位置修正？？

import java.io.*;
import java.lang.*;
import java.math.*;
import java.util.*;
 
public class HW20141216 {
  static String strCurrentLong = "";
  static long startLong = 0;
  static long currentLong = 0;
  static String OPRATOR_PLUS = "*";
  static TreeSet<Long> primeSet = new TreeSet<Long>();
  static boolean isToBeChecked = false;
  static String stringPrimeFact = "";
  static BufferedReader br = null;
  
  /*定数*/
  static final int MAX_DIGIT = 15;
  static final String START_COMMENT = "整数を入力してください。";
  static final String WARN_COMMENT = "2以上の整数を入力してください。";
  
  public static void main (String[] args) throws IOException, NumberFormatException {
    primeSet.add(new Long (2));
    try {
      br = new BufferedReader(new InputStreamReader(System.in));
      System.out.println(START_COMMENT);
      readLineAndLongConvert();
      while (!(currentLong >=2)) {
        System.out.println(WARN_COMMENT);
        readLineAndLongConvert();
      }
      startLong = currentLong;
      long workLong = 2;
      makePrimeFactorization (workLong, currentLong);
    } catch (IOException iEx) {
      System.out.println(iEx.toString());
    } catch (NumberFormatException nEx) {
      System.out.println(nEx.toString());
    } finally {
      if (br != null) {
        br.close();
      }
      
    }
  }

  private static void makePrimeFactorization (long workLong, long currentLong) {
    while (currentLong !=1) {
      if(isToBeChecked(workLong) && currentLong % workLong == 0) {
        currentLong /= workLong;
        stringPrimeFact += workLong + OPRATOR_PLUS;
      } else {
        workLong = workLong > 2 ? workLong + 2 : workLong + 1;
      }
    }
    if (stringPrimeFact.length() > 0) {
      stringPrimeFact = stringPrimeFact.substring(0, stringPrimeFact.length() - 1);
      System.out.println(startLong + " = " + stringPrimeFact);
    }
  }

  private static void readLineAndLongConvert() throws IOException, NumberFormatException{
    strCurrentLong = br.readLine();
    currentLong = Long.parseLong(strCurrentLong);
  }

  private static boolean isToBeChecked (long workLong) {
    if(primeSet.contains(new Long(workLong))){
      return true;
    }
    for (long j :primeSet) {
      if(workLong % j == 0) {
        return false; 
      }else if (workLong % j != 0 && (double)j >= (double)Math.sqrt(workLong)){
        primeSet.add(new Long(workLong));
        return true;
      }
    }
    primeSet.add(new Long(workLong));
    return true;
  }
}

HW20150106 †

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class HW20150106 extends Applet implements MouseListener,MouseMotionListener {

  ArrayList<Point> points = new ArrayList<Point>();
  Point currentPoint;

  public void init(){
    addMouseListener(this);
    addMouseMotionListener(this);
  }

  public void paint(Graphics g){
    g.setColor(Color.red);
    Point prevPoint;
    if(points.isEmpty()){
      return;
    } else {
      prevPoint = points.get(0);
    }
    for (Point point : points) {
      g.drawLine(point.x, point.y, prevPoint.x, prevPoint.y);
      prevPoint = point;
    }
  }

  // マウスリスナー
  public void mousePressed(MouseEvent ev){
    System.out.println("mouse pressed");
  }
  public void mouseReleased(MouseEvent ev){
    System.out.println("mouse released");
  }
  public void mouseClicked(MouseEvent ev){
    currentPoint = new Point(ev.getX(), ev.getY());
    points.add(currentPoint);
    repaint();
    System.out.println("mouse clicked");
  }
  public void mouseEntered(MouseEvent ev){
    System.out.println("mouse entered");
    setBackground(Color.white);
  }
  public void mouseExited(MouseEvent ev){
    System.out.println("mouse exited");
    setBackground(Color.black);
  }
  public void mouseDragged(MouseEvent ev){
    if(currentPoint == null){
      currentPoint = new Point(ev.getX(), ev.getY());
    }
    int deltaX = ev.getX() - currentPoint.x;
    int deltaY = ev.getY() - currentPoint.y;
    for (Point point : points) {
      point.translate(deltaX, deltaY);
    }
    repaint();
  }
  public void mouseMoved(MouseEvent ev){
  }
}