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我认为这个问题没有被明确提出，所以我将尝试解释：

我正在尝试绘制一个全加器，每个门都被绘制为一个单独的子类；所以加法器是一类，它将调用异或门并放置它们，然后是与门等等。

自己绘制门（并在加法器方法中创建组件）效果很好，但是当我尝试在加法器中调用它们时，我收到了编译器的抱怨。

转换为形状会创建 ClassCastException；而且我不知道为什么编译器不喜欢绘制它们。

这是我所有课程的链接。

Adder.java 包加法器；

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;

import javax.swing.JComponent;
import javax.swing.JFrame;

import andGate.*;

public class Adder
{
    private final int HEIGHT = 700;
    private final int WIDTH = 1200;
    private int xLeft = 0;
    private int yTop = 0;

    /**
     * Constructs a gate with a corner at (0,0)
     */
    public Adder()
    {
        new Adder(xLeft, yTop);
    }

    /**
     * Constructs a gate with the given top left corner
     * @param x the x co-ordinate of the top left point
     * @param y the y co-ordinate of the top left point
     */
    public Adder(int x, int y)
    {
        xLeft = x;
        yTop = y;
    }

    /**
     * Draw the gate
     * @param g2 the graphics context
     */
    public void draw(Graphics2D g2)
    {
         AndGate and = new AndGate();

        g2.draw(and);
    }       
}

AdderComponent.java 包加法器；

import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JComponent;

import andGate.*;

@SuppressWarnings("serial")
public class AdderComponent extends JComponent
{
    public void paintComponent(Graphics g)
    {
        Graphics2D g2 = (Graphics2D) g;

        Adder ad = new Adder(20, 20);

        ad.draw(g2);
    }
}

AdderVeiwer.java 包加法器；

import javax.swing.JFrame;

import andGate.*;

public class AdderVeiwer
{

    public static void main(String[] args)
    {
        JFrame frame = new JFrame();

        frame.setSize(1200, 700);
        frame.setTitle("Full Adder");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        AdderComponent ad = new AdderComponent();
        frame.add(ad);
    }

}

AndGate.java 封装andGate；

import java.awt.Graphics2D;
import java.awt.geom.Arc2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;

public class AndGate
{
    private final int WIDTH = 300;
    private final int HEIGHT = 100;
    private int xLeft = 0;
    private int yTop = 0;

    /**
     * Constructs a gate with a corner at (0,0)
     */
    public AndGate()
    {
        new AndGate(xLeft, yTop);
    }

    /**
     * Constructs a gate with the given top left corner
     * @param x the x co-ordinate of the top left point
     * @param y the y co-ordinate of the top left point
     */
    public AndGate(int x, int y)
    {
        xLeft = x;
        yTop = y;
    }

    /**
     * Draw the gate
     * @param g2 the graphics context
     */
    public void draw(Graphics2D g2)
    {
        //Main shape
        Point2D.Double p1 = new Point2D.Double(xLeft + WIDTH * 1/3, yTop);
        Point2D.Double p2 = new Point2D.Double(xLeft + WIDTH * 1/3, yTop + HEIGHT);
        Point2D.Double p3 = new Point2D.Double(xLeft + WIDTH * 7/12, yTop);
        Point2D.Double p4 = new Point2D.Double(xLeft + WIDTH * 7/12, yTop + HEIGHT);

        Line2D.Double verticle = new Line2D.Double(p1, p2);
        Line2D.Double horizontal1 = new Line2D.Double(p1, p3);
        Line2D.Double horizontal2 = new Line2D.Double(p2, p4);

        Arc2D.Double arc = new Arc2D.Double(xLeft + WIDTH * 4/12, yTop, xLeft + WIDTH * 4/12, 
                yTop + HEIGHT * 19/24, 270, 180, Arc2D.OPEN);

        //Output wire
        Point2D.Double p5 = new Point2D.Double(xLeft + WIDTH * 11/15, yTop + HEIGHT * 1/2);
        Point2D.Double p6 = new Point2D.Double(xLeft + WIDTH, yTop + HEIGHT * 1/2);

        Line2D.Double out = new Line2D.Double(p5, p6);

        //Input wire 1
        Point2D.Double p7 = new Point2D.Double(xLeft, yTop + HEIGHT * 1/3);
        Point2D.Double p8 = new Point2D.Double(xLeft + WIDTH * 1/3, yTop + HEIGHT * 1/3);

        Line2D.Double in1 = new Line2D.Double(p7, p8);

        //Input wire 2
        Point2D.Double p9 = new Point2D.Double(xLeft, yTop + HEIGHT * 2/3);
        Point2D.Double p10 = new Point2D.Double(xLeft + WIDTH * 1/3, yTop + HEIGHT * 2/3);

        Line2D.Double in2 = new Line2D.Double(p9, p10);

        //Draw
        g2.draw(verticle);
        g2.draw(horizontal1);
        g2.draw(horizontal2);
        g2.draw(arc);
        g2.draw(out);
        g2.draw(in1);
        g2.draw(in2);

    }

}

AndGateComponent.java 封装andGate；

import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JComponent;

@SuppressWarnings("serial")
public class AndGateComponent extends JComponent
{
    public void paintComponent(Graphics g)
    {
        Graphics2D g2 = (Graphics2D) g;

        AndGate ag = new AndGate(20, 20);

        ag.draw(g2);
    }
}

AndGateViewer 封装和Gate；

import javax.swing.JFrame;

public class AndGateViewer
{
    public static void main(String[] args)
    {
        JFrame frame = new JFrame();

        frame.setSize(1200, 700);
        frame.setTitle("And Gate");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        AndGateComponent ag = new AndGateComponent();
        frame.add(ag);
    }
}
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1 回答 1

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一个朋友帮我解决了。我需要做的只是在 AdderComponent.java 文件中绘制门，而不是在 Adder.java 中。

实际上根本不需要 Adder.java 类。

AdderComponent.java

package adder;

import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JComponent;

import andGate.*;

@SuppressWarnings("serial")
public class AdderComponent extends JComponent
{
    public void paintComponent(Graphics g)
    {
        Graphics2D g2 = (Graphics2D) g;

        AndGate and = new AndGate(20, 20);
        and.draw(g2);
    }
}
于 2013-10-15T13:10:57.903 回答