Question

我是一名初学Java程序员，并且已经花了很长时间。我需要将下面的程序转换为OOP格式，并且无法在没有错误的情况下进行编译。我想我会发布工作的非格式化程序，而不是我失败和不稳定的尝试。如果有人可以将以下程序转换为OOP，那将非常感激。请原谅任何低效率或邋iness，因为我是新手。

感谢您的帮助

import java.awt.*;

public class Turtle3 {

  public static void drawLine(Turtle myrtle, Color color, int x1, int y1, int x2, int y2) {
    myrtle.hide();
    myrtle.penUp();
    myrtle.setPenColor(color);
    myrtle.moveTo(x1, y1); 
    myrtle.penDown(); 
    myrtle.moveTo(x2, y2);  
  }

  public static void setPenWidth(int w) {
    World worldObj = new World(); 
    Turtle myrtle = new Turtle(200, 200, worldObj); 
    Turtle billy = new Turtle(100, 700, worldObj);
    Turtle thomas = new Turtle(100, 100, worldObj);
    myrtle.setColor(Color.RED);
    myrtle.setPenWidth(50);
    myrtle.forward(50);
    myrtle.show();
    billy.setColor(Color.BLUE);
    billy.setPenWidth(100);
    billy.forward(300);
    thomas.show();
    thomas.setColor(Color.BLACK);
    thomas.setPenWidth(100);
    thomas.forward(50);
    thomas.show();
  };

  public static void main(String[] args) {      
    World worldObj = new World();
    Turtle myrtleTheTurtle = new Turtle(0, 0, worldObj); 

    drawLine(myrtleTheTurtle, Color.RED, 10, 20, 700, 20);      
    drawLine(myrtleTheTurtle, Color.BLUE, 10, 40, 700, 40);
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 60, 700, 60);              
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 80, 700, 80);
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 100, 700, 100);
    drawLine(myrtleTheTurtle, Color.RED, 10, 120, 700, 120);      
    drawLine(myrtleTheTurtle, Color.BLUE, 10, 140, 700, 140);
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 160, 700, 160);              
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 180, 700, 180);
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 200, 700, 200);
    drawLine(myrtleTheTurtle, Color.RED, 10, 220, 700, 220);      
    drawLine(myrtleTheTurtle, Color.BLUE, 10, 240, 700, 240);
    drawLine(myrtleTheTurtle, Color.RED, 10, 260, 700, 260);      
    drawLine(myrtleTheTurtle, Color.BLUE, 10, 280, 700, 280);
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 300, 700, 300);              
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 320, 700, 320);
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 340, 700, 340);
    drawLine(myrtleTheTurtle, Color.RED, 10, 360, 700, 360);      
    drawLine(myrtleTheTurtle, Color.BLUE, 10, 380, 700, 380);
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 400, 700, 400);              
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 420, 700, 420);
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 440, 700, 440);
    drawLine(myrtleTheTurtle, Color.BLUE, 10, 460, 700, 460);
    drawLine(myrtleTheTurtle, Color.BLACK, 10, 480, 700, 480);
    drawLine(myrtleTheTurtle, Color.BLACK, 480, 10, 480, 700);
    drawLine(myrtleTheTurtle, Color.BLACK, 180, 10, 180, 700);
    drawLine(myrtleTheTurtle, Color.BLACK, 480, 10, 480, 700);
    drawLine(myrtleTheTurtle, Color.BLACK, 330, 10, 330, 700);

    setPenWidth(50);  
  }//end of main method
}//end of class

Answer 1

我不确定你在问什么。您已在setPenWidth()方法中使用OOP。如果您想在程序中使用更多OOP，您可能希望将方法drawLine()移至Turtle类，并将其更改为

public void drawLine(Color color, int x1, int y1, int x2, int y2)
{
    this.hide();
    this.penUp();
    this.setPenColor(color);
    this.moveTo(x1, y1); 
    this.penDown(); 
    this.moveTo(x2, y2);  
}

引用Turtle的当前实例，而不需要将其作为参数传递。注意：您必须取消静态关键字才能生效。然后，您必须更改主要方法中的代码，才能将drawLine()的调用从drawLine(myrtleTheTurtle, color, x1, y1, x2, y2);更改为myrtleTheTurtle.drawLine(color, x1, y1, x2, y2)

将Java程序转换为面向对象的格式（基本）

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