Re: java��ͼ��

Article View: cn.bbs.comp.lang.java

Article #19429

Back to cn.bbs.comp.lang.java Previous Next

#19429

From: ��
Date: Tue, 06 Jan 2004 10:41

22 lines
1755 bytes

Ӧ����g��null object�ɣ�
Graphics��һ��interface������һ��class��
����Կ����ڻص�����pain����paintComponent�������drawing������

�� �� waitting. �Ĵ������ᵽ: ��
: �տ�ʼ����������ȥ��
: �������£�
:  private void jbInit() throws Exception  {
:     contentPane = (JPanel) this.getContentPane();
:     contentPane.setLayout(borderLayout1);
:     Graphics g = getGraphics();
:     g.drawString("haha",4,4);
:     this.setSize(new Dimension(400, 300));
:     this.setTitle("Matrix3D");
:   }
: ���ڴ����ڻ��㶫����д����
: ���ǵ���g.drawString��һ�оͳ�һ��NullPointerException
: ����ô�����أ�

--
�뿪�����֪������ã�����˰����֪���Ժ󲻻����Ķ�һ�Ρ�
[0;1;37m�� ��Դ:���ɽ��ˮ bbs.neu.edu.cn��[FROM: 210.83.210.174][m

Technical Details

Message-ID: <4A9d9c$Caz@bbs.neu.edu.cn>

Path:

arc1-ca.pugleaf.net!archiver1.google.com!news2.google.com!news.maxwell.syr.edu!feed2.newsreader.com!newsreader.com!maily.cic.tsinghua.edu.cn!news.neu.edu.cn!NEU

Show Full Headers

Complete Article Headers

X-Google-Language: Chinese,GB
X-Google-Thread: f6cb0,33ad995b7043c785
X-Google-Attributes: gidf6cb0,public
X-Google-ArrivalTime: 2004-01-06 02:42:08 PST
Path: arc1-ca.pugleaf.net!archiver1.google.com!news2.google.com!news.maxwell.syr.edu!feed2.newsreader.com!newsreader.com!maily.cic.tsinghua.edu.cn!news.neu.edu.cn!NEU
From: stillicel.bbs@bbs.neu.edu.cn (����)
Newsgroups: cn.bbs.comp.lang.java
Subject: Re: java��ͼ����
Date: 06 Jan 2004 10:41:26 GMT
Organization: ��ɽ��ˮ
Message-ID: <4A9d9c$Caz@bbs.neu.edu.cn>
Mime-Version: 1.0
Content-Type: text/plain; charset="gb2312"
Content-Transfer-Encoding: 8bit
X-Filename: java/M.1073385686.A
Lines: 22

Article View: cn.bbs.comp.lang.java

Re: java��ͼ����

Re: java��ͼ��