我在出错的地方注释了，一个java程序

[houshen13828468384]

package drawTest1;

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;

public class DrawTest1 {
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
DrawSomeThingInterest picture=new DrawSomeThingInterest();//显示的是这行出错了 picture.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
picture.setVisible(true);
}
});
}
class DrawSomeThingInterest extends JFrame
{
public DrawSomeThingInterest()
{
setTitle("interest pictures");
setSize(DEFAULT_WIDTH,DEFAULT_HIGHT);
DrawingRun gameforme=new DrawingRun();
add(gameforme);
}

public static final int DEFAULT_WIDTH=600;
public static final int DEFAULT_HIGHT=500;
}
}

class DrawingRun extends JComponent
{
public void paintComponent(Graphics g)
{
Graphics2D g2=(Graphics2D) g;

double x1=10;
double y1=20;
double x2=100;
double y2=200;

Rectangle2D a1=new Rectangle2D.Double(x1,y1,x2,y2);
g2.draw(a1);

Ellipse2D ellipse=new Ellipse2D.Double();
ellipse.setFrame(a1);
g2.draw(ellipse);

g2.draw(new Line2D.Double(x1,y1,x1+x2,y1+y2));

double centerX=a1.getCenterX();
double centerY=a1.getCenterY();
double radius=200;

Ellipse2D circle=new Ellipse2D.Double();
circle.setFrameFromCenter(centerX,centerY,centerX+radius,centerY+radius);
g2.draw(circle);
}
}




程序运行后显示：
Exception in thread "main" java.lang.Error: 无法解析的编译问题：
没有任何类型 DrawTest1 的外层实例可访问。必须用类型 DrawTest1 的外层实例（例如，x.new A()，其中 x 是 DrawTest1 的实例）来限定分配。

at drawTest1.DrawTest1.main(DrawTest1.java:14)


不知为何，希望指点

[stamp80]

把DrawSomeThingInterest的类定义从DrawTest1当中移出来，不然的话它是内部类，访问受限。程序如下：

package drawTest1; 

import java.awt.*; 
import java.awt.geom.*; 
import javax.swing.*; 

public class DrawTest1 { 
public static void main(String[] args) 
{ 
	DrawTest1 t=new DrawTest1();
  EventQueue.invokeLater(new Runnable() 
  { 
  public void run() 
  { 
  DrawSomeThingInterest picture=new DrawSomeThingInterest();//显示的是这行出错了 
  picture.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
  picture.setVisible(true); 
  } 
  }); 
} 
 
} 

class DrawSomeThingInterest extends JFrame 
{ 
public DrawSomeThingInterest() 
{ 
setTitle("interest pictures"); 
setSize(DEFAULT_WIDTH,DEFAULT_HIGHT); 
DrawingRun gameforme=new DrawingRun(); 
add(gameforme); 
} 

public static final int DEFAULT_WIDTH=600; 
public static final int DEFAULT_HIGHT=500; 
}

class DrawingRun extends JComponent 
{ 
public void paintComponent(Graphics g) 
{ 
Graphics2D g2=(Graphics2D) g; 

double x1=10; 
double y1=20; 
double x2=100; 
double y2=200; 

Rectangle2D a1=new Rectangle2D.Double(x1,y1,x2,y2); 
g2.draw(a1); 

Ellipse2D ellipse=new Ellipse2D.Double(); 
ellipse.setFrame(a1); 
g2.draw(ellipse); 

g2.draw(new Line2D.Double(x1,y1,x1+x2,y1+y2)); 

double centerX=a1.getCenterX(); 
double centerY=a1.getCenterY(); 
double radius=200; 

Ellipse2D circle=new Ellipse2D.Double(); 
circle.setFrameFromCenter(centerX,centerY,centerX+radius,centerY+radius); 
g2.draw(circle); 
} 
} 

[houshen13828468384]

哦，这样啊

[b_what_u_wanna_b_8]

come on 今天我也遇到这情况 原来是写错了大括号{ 包含成内部类了 话说内部类为什么会受限了？