Question

好的，所以我对编程很新。我有一个班级作业，具体说明如下：
“PolygonArtMaker.java的主要代码中的代码，用于调用tRef引用的ArtisticTurtle上的五边形方法，以使应用程序在运行时绘制五边形。”

从我的解释来看，这意味着当我点击Run on Polygon artmaker时，它还会运行Artistic Turtle并使用方法app绘制....

我已经尝试了一段时间而且无法弄明白，任何帮助都会受到赞赏。

Polygon artmaker

public class PolygonArtMaker
{
   public static void main(String [] a)
   {
     World wRef = new World( );
     ArtisticTurtle tRef = new ArtisticTurtle ( wRef );
     tref.forward( 50 );
   }
}

使用方法应用

public class DrawWithMethodsApp
{
  public static void main(String[] a)
  {
    System.out.println("Hello from main!");
    World wref = new World();
    ArtisticTurtle tref = new ArtisticTurtle( wref );

    tref.setPenColor( java.awt.Color.RED );
    tref.pentagon( 2 );
    tref.penUp();
    tref.moveTo( 50,463);
    tref.penDown();
    tref.pentagon( 5 );
    tref.penUp();
    tref.moveTo(350,89);
    tref.penDown();
    tref.pentagon( 8 );
    tref.penUp();
    tref.moveTo( 100, 260);
    tref.penDown();
    tref.hexagon( 5 );
    tref.penUp();
    tref.moveTo( 500, 110 );
    tref.penDown();
    tref.hexagon( 7 );
    tref.penUp();
    tref.moveTo( 360, 310 );
    tref.penDown();
    tref.hexagon( 9 );



**Artistic Turtle **


public class ArtisticTurtle extends Turtle
{
  public void hook( int numberParam )
  {
    System.out.println( "The hook method has been called on ArtisticTurtle "
                         +
                         this
                         +
                         "with parameter value equal to "
                         +
                         numberParam
                      );

  }
  public void pentagon( int numberParam )
  {
    System.out.println
      ("pentagon called with param "
         + numberParam);
    int curLen;
    curLen = (numberParam) ;
    this.forward ( 10*curLen );
    this.turn( 360.0/5 );
    this.forward( 10*curLen );
    this.turn( 360.0/5 );
    this.forward( 10*curLen);
    this.turn( 360.0/5 );
    this.forward( 10*curLen );
    this.turn( 360.0/5 );
    this.forward( 10*curLen );
  }    
 public void hexagon( int numberParam) 
 {
   System.out.println 
     ("hexagon called with param " 
        + numberParam);
   int curLen;
   curLen = (numberParam) ;
    this.forward( 10*curLen );
    this.turn( 60 );
    this.forward( 10*curLen);
    this.turn( 60 );
    this.forward( 10*curLen);
    this.turn( 60 );
    this.forward( 10*curLen);
    this.turn( 60 );
    this.forward( 10*curLen);
    this.turn( 60 );
    this.forward( 10*curLen );


 }








  public ArtisticTurtle( World wrefParam )
  {
    super( wrefParam );
  }
  public static void main(String[] a)
  {
    System.out.println("DONT RUN ArtisticTurtle!!");
    System.out.println("Select DrawWithMethodsApp");
    System.out.println("and RUN that!");
  }
}

Answer 1

因此，根据我的理解，您需要从PolygonArtMaker主函数调用五边形函数。要做到这一点，你需要首先通过调用它的构造函数（你已经）来创建一个ArtisticTurtle的实例。然后你需要做的就是通过对象调用函数。在这种情况下，您需要：

public class PolygonArtMaker{
   public static void main(String [] args){
        World wRef = new World( );
        ArtisticTurtle tRef = new ArtisticTurtle ( wRef );
        // this is just some random number I chose, not sure where you are supposed to get this value.
        int num = 7;
        // here is where the magic happens - call the function in the other class 
        tRef.pentagon(num);
   }
}

你有一条tref线。我认为你的意思是tRef。希望这可以帮助。如果您需要更多指导，请告诉我：）

从另一个类调用方法

1 个答案: