java.lang.NullPointException ¿¡·¯ ¹®Á¦´Â ÇØ°áÀ» Çߴµ¥.....ÂÁ


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±Û¾´ÀÌ :±è¼öÈ£ 1998³â 5¿ù 22ÀÏ 11:50:31

In Reply to: ´Ù½Ã Áú¹® ÇÕ´Ï´Ù. posted by ±è¼öÈ£ on 1998³â 5¿ù 22ÀÏ 10:15:13:

¾Æ·¡ ºÎºÐ¿¡¼­ ¿øÇÏ´Â ´ë·Î Àß µÇÁö°¡ ¾Ê½À´Ï´Ù.
boolean °ª¿¡ µû¶ó¼­ paint()¸Þ¼ÒµåÀÇ ³»¿ëÀ» º¯°æ½ÃÅ°°íÀÚ Çϴµ¥ ¸»ÀÔ´Ï´Ù.
ÀÌ°Ô boolean b = true;¶ó°í ¼±¾ðÇØ ÁØ °Í ¿Ü¿¡´Â º¯°æÀ» ÇÏÁö ¾Ê½À´Ï´Ù.
HAstatusThread.java¿¡¼­ ³Ñ¾î¿Â return °ªÀ» ¹®ÀÚ¿­ ONLINE_PRIMARY¿Í ºñ±³¸¦ Çؼ­
°°À¸¸é true¸¦ ¹ÝȯÇÏ°í ±× °á°ú¿¡ µû¶ó¼­ paint()¸Þ¼Òµå ³»¿ëÀ» º¯°æ½ÃÅ°°í ½Í½À´Ï´Ù.
±×·±µ¥ Àß ¾ÈµÇ³×¿ä.


public static boolean isLocalRunning()
{
tmp = HAstatusThread.run("HAevent STATUS");
boolean b = true;


if(tmp.equals("ONLINE_PRIMARY"))
b = true;
else if(tmp.equals("DOWN"))
b = false;
return b;
}


public void paint(Graphics g) {


....»ý·«


¿©±â ÀÌ ºÎºÐÀÌ ¾Æ¹«·± µ¿ÀÛÀ» ÇÏÁö ¾Ê´Â °Í °°°Åµç¿ä. boolean b = true;¶ó°í ÃʱâÈ­
½ÃÅ°¸é ¾Æ¹« ¹®Á¦°¡ ¾øÁö¸¸ HAstatusThread.java¿¡¼­ ³Ñ¾î ¿Â °á°ú´Â ONLINE_PRIMARY¶ó´Â
°Í°ú ÀÏÄ¡¸¦ Çؼ­ trueÀε¥ boolean b = false;¶ó°í ÇØ µÎ¸é ¹«Á¶°Ç falseÀÎ °æ¿ì·Î 󸮸¦
Çؼ­ ¿øÇÏ´Â °á°ú°¡ ³ª¿ÀÁö ¾Ê½À´Ï´Ù. ¼Ò½º¸¦ º¸½Ã°í ¹«¾ùÀÌ ¹®Á¦ÀÎÁö ÇØ°áÀ» ÇØ ÁÖ½Ã¸é °¨»ç
ÇÏ°Ú½À´Ï´Ù. NullPointException ¿¡·¯ ¹®Á¦´Â ÇØ°áÀ» Çß½À´Ï´Ù.


if(isLocalRunning() == true) {
g.setFont(f);
g.setColor(Color.red);
g.drawString("Active",118,190);
g.setColor(Color.green);
g.drawRect(210,270,375,7);
g.fillRect(210,270,375,7);
} else if(isLocalRunning() == false) {
g.setFont(f);
g.setColor(Color.red);
g.drawString("IDLE",118,190);
g.setColor(Color.red);
g.drawRect(210,270,375,7);
g.fillRect(210,270,375,7);
}


......


}


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