本文介绍了无法获取NetBeans的访问＆QUOT; FigurePanel＆QUOT;在Java中的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我是初学者，当谈到Java的，我下面从一本书中的说明。我要创建具有以下code一FigurePanel：
I'm a beginner when it comes to Java and I'm following the instructions from a book. I am going to create a FigurePanel with the following code:
import java.awt.*;
import javax.swing.*;
public class TestFigurePanel extends JFrame{
public TestFigurePanel() {
setLayout(new GridLayout(2, 3, 5, 5));
add(new FigurePanel(FigurePanel.LINE));
}
}
但在增加（新FigurePanel（FigurePanel.LINE））;我收到以下错误：
But at the "add(new FigurePanel(FigurePanel.LINE));" I get the following error:
找不到符号：
符号：类FigurePanel
Symbol: class FigurePanel
类：TestFigurePanel
class: TestFigurePanel"
我将非常高兴，如果有人好告诉我是什么原因造成这个问题。
I would be very happy if someone good inform me of what is causing this problem.
推荐答案
添加这个类在你的包：
import java.awt.*;
import javax.swing.JPanel;
public class FigurePanel extends JPanel {
// Define constants
public static final int LINE = 1;
public static final int RECTANGLE = 2;
public static final int ROUND_RECTANGLE = 3;
public static final int OVAL = 4;
private int type = 1;
private boolean filled;
/** Construct a default FigurePanel */
public FigurePanel() {
}
/** Construct a FigurePanel with the specified type */
public FigurePanel(int type) {
this.type = type;
}
/** Construct a FigurePanel with the specified type and filled */
public FigurePanel(int type, boolean filled) {
this.type = type;
this.filled = filled;
}
/** Draw a figure on the panel */
public void paintComponent(Graphics g) {
super.paintComponent(g);
// Get the appropriate size for the figure
int width = getSize().width;
int height = getSize().height;
switch (type) {
case LINE: // Display two cross lines
g.setColor(Color.BLACK);
g.drawLine(10, 10, width - 10, height - 10);
g.drawLine(width - 10, 10, 10, height - 10);
break;
case RECTANGLE: // Display a rectangle
g.setColor(Color.BLUE);
if (filled)
g.fillRect((int)(0.1 * width), (int)(0.1 * height),
(int)(0.8 * width), (int)(0.8 * height));
else
g.drawRect((int)(0.1 * width), (int)(0.1 * height),
(int)(0.8 * width), (int)(0.8 * height));
break;
case ROUND_RECTANGLE: // Display a round-cornered rectangle
g.setColor(Color.RED);
if (filled)
g.fillRoundRect((int)(0.1 * width), (int)(0.1 * height),
(int)(0.8 * width), (int)(0.8 * height), 20, 20);
else
g.drawRoundRect((int)(0.1 * width), (int)(0.1 * height),
(int)(0.8 * width), (int)(0.8 * height), 20, 20);
break;
case OVAL: // Display an oval
g.setColor(Color.BLACK);
if (filled)
g.fillOval((int)(0.1 * width), (int)(0.1 * height),
(int)(0.8 * width), (int)(0.8 * height));
else
g.drawOval((int)(0.1 * width), (int)(0.1 * height),
(int)(0.8 * width), (int)(0.8 * height));
}
}
/** Set a new figure type */
public void setType(int type) {
this.type = type;
repaint();
}
/** Return figure type */
public int getType() {
return type;
}
/** Set a new filled property */
public void setFilled(boolean filled) {
this.filled = filled;
repaint();
}
/** Check if the figure is filled */
public boolean isFilled() {
return filled;
}
/** Specify preferred size */
public Dimension getPreferredSize() {
return new Dimension(80, 80);
}
}
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