3

Java で別のクラスからメソッドを呼び出そうとしていますが、うまくいかないか、何か間違っています。私が達成したいRaceのは、クラスにあるメソッドをRacingEventメインプログラムに呼び出すことです(メインプログラムのコメントを確認してください)。

クラスは次のとおりです。

import java.util.Random;

public class RacingEvent {
    private SimpleWindow w;
    private RaceTrack track;
    private Turtle t1 = new Turtle(w, 200, 400);
    private Turtle t2 = new Turtle(w, 300, 400);

    public RacingEvent(RaceTrack track, Turtle t1, Turtle t2) {
        this.t1 = t1;
        this.t2 = t2;
        this.track = track;
 }

    public void Race() {
        t1.penDown();
        t2.penDown();
        Random rand = new Random();

        Turtle t1 = new Turtle(w, 200, 400);
        Turtle t2 = new Turtle(w, 300, 400);

        while (t1.getY() > track.getyFinish() && t2.getY() > track.getyFinish()) {
            int turtle1 = rand.nextInt(3);
            int turtle2 = rand.nextInt(3);
            t1.forward(turtle1);
            t2.forward(turtle2);

            SimpleWindow.delay(10);
        }


        int diff1 = t1.getY() - track.getyFinish();
        int diff2 = t2.getY() - track.getyFinish();

        SimpleWindow w = new SimpleWindow(200, 100, "Winner");

        if (t1.getY() <= track.getyFinish()) {
            w.moveTo(20, 40);
            w.writeText("T1 won with a " + diff2 + " step(s) lead!");
        } else if (t2.getY() <= track.getyFinish()) {
            w.moveTo(20, 40);
            w.writeText("T2 won with a " + diff1 + " step(s) lead!");
        }
    }
}

メソッドを呼び出す必要があるメイン プログラムは次のとおりです。

public class TurtleRace {
    public static void main(String[] args) {
        SimpleWindow w = new SimpleWindow(600, 600, "TurtleRace");
        int yStart = 400; 
        int yFinish = 100; 

        RaceTrack track = new RaceTrack(w, yStart, yFinish);
        ColorTurtle t1 = new ColorTurtle(w, 250, yStart, java.awt.Color.RED);
        ColorTurtle t2 = new ColorTurtle(w, 350, yStart, java.awt.Color.BLUE);

        track.draw(w);
        w.waitForMouseClick();

        RacingEvent event = new RacingEvent(track, t1, t2);
        /*Call Race Method*/
    }
}
4

3 に答える 3

2

これを行うと

RacingEvent event = new RacingEvent(track, t1, t2);

RacingEvent クラスのオブジェクトを作成してインスタンス化しているだけです。

関数呼び出しはまだ行われていません。

関数を呼び出すには、これを記述する必要があります。

event.Race();

問題が解決することを願っています。

于 2012-11-20T18:06:33.630 に答える
2

RacingEventwフィールドを初期化しません。呼び出し元 (wそこでも呼び出される) が使用できる値をコンストラクターにw渡し、渡された引数に設定することができます。

詳細に：

コンストラクタを次のように変更します

public RacingEvent(SimpleWindow w, RaceTrack track, Turtle t1, Turtle t2) {
        this.w = w;
        this.t1 = t1;
        this.t2 = t2;
        this.track = track;
 }

次のように呼び出します。

 RacingEvent event = new RacingEvent(w, track, t1, t2);
 event.race();
于 2012-11-20T18:09:24.093 に答える
0

簡素化されたソリューション:

import java.awt.*;
import java.util.Random;

class SimpleWindow {
  public SimpleWindow(int i, int i1, String winner) {
    //To change body of created methods use File | Settings | File Templates.
  }

  public static void delay(int i) {
    //To change body of created methods use File | Settings | File Templates.
  }

  public void moveTo(int i, int i1) {
    //To change body of created methods use File | Settings | File Templates.
  }

  public void writeText(String s) {
    //To change body of created methods use File | Settings | File Templates.
  }

  public void waitForMouseClick() {
    //To change body of created methods use File | Settings | File Templates.
  }
}
class ColorTurtle extends Turtle {
  public ColorTurtle(SimpleWindow w, int i, int yStart, Color red) {
    //To change body of created methods use File | Settings | File Templates.
  }

  public ColorTurtle(SimpleWindow w, int i, int i1) {
    super(w, i, i1);
  }
}

class RaceTrack {
  private int yFinish;

  public RaceTrack(SimpleWindow w, int yStart, int yFinish) {
    //To change body of created methods use File | Settings | File Templates.
  }

  public int getyFinish() {
    return yFinish;
  }

  public void draw(SimpleWindow w) {
    //To change body of created methods use File | Settings | File Templates.
  }
}
class Turtle {
  private int y;

  public Turtle(SimpleWindow w, int i, int i1) {
    //To change body of created methods use File | Settings | File Templates.
  }

  Turtle() {
  }

  public void penDown() {
    //To change body of created methods use File | Settings | File Templates.
  }

  public int getY() {
    return y;
  }

  public void forward(int turtle1) {
    //To change body of created methods use File | Settings | File Templates.
  }
}
class RacingEvent {
  private SimpleWindow w;
  private RaceTrack track;
  private Turtle t1 = new Turtle(w, 200, 400);
  private Turtle t2 = new Turtle(w, 300, 400);

  public RacingEvent(RaceTrack track, Turtle t1, Turtle t2) {
    this.t1 = t1;
    this.t2 = t2;
    this.track = track;
  }

  public void Race() {
    t1.penDown();
    t2.penDown();
    Random rand = new Random();

    Turtle t1 = new Turtle(w, 200, 400);
    Turtle t2 = new Turtle(w, 300, 400);

    while (t1.getY() > track.getyFinish() && t2.getY() > track.getyFinish()) {
      int turtle1 = rand.nextInt(3);
      int turtle2 = rand.nextInt(3);
      t1.forward(turtle1);
      t2.forward(turtle2);

      SimpleWindow.delay(10);
    }


    int diff1 = t1.getY() - track.getyFinish();
    int diff2 = t2.getY() - track.getyFinish();

    SimpleWindow w = new SimpleWindow(200, 100, "Winner");

    if (t1.getY() <= track.getyFinish()) {
      w.moveTo(20, 40);
      w.writeText("T1 won with a " + diff2 + " step(s) lead!");
    } else if (t2.getY() <= track.getyFinish()) {
      w.moveTo(20, 40);
      w.writeText("T2 won with a " + diff1 + " step(s) lead!");
    }
  }
}
public class TurtleRace {
  public static void main(String[] args) {
    SimpleWindow w = new SimpleWindow(600, 600, "TurtleRace");
    int yStart = 400;
    int yFinish = 100;

    RaceTrack track = new RaceTrack(w, yStart, yFinish);
    ColorTurtle t1 = new ColorTurtle(w, 250, yStart, java.awt.Color.RED);
    ColorTurtle t2 = new ColorTurtle(w, 350, yStart, java.awt.Color.BLUE);

    track.draw(w);
    w.waitForMouseClick();

    RacingEvent event = new RacingEvent(track, t1, t2);
    /*Call Race Method*/
    event.Race();
  }
}
于 2012-11-20T18:20:46.717 に答える