Posted by ÀÓäÀÏ on July 12, 1997 at 06:46:25:
In Reply to: NullPointException posted by ÀÌÁ¤ÀÓ on July 07, 1997 at 13:33:26:
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²Ò ¿À·¡ µÆ´Âµ¥ ´äº¯ÀÌ ¾ø¾î¼ ÀÌ·¸°Ô ¿Ã¸³´Ï´Ù.
package¿¡ º¸¸é ¸¹Àº omponentµéÀ» º¸½Ç¼ö ÀÖÀ»°ÍÀÔ´Ï´Ù.
ÀÌ·± componetµéÀ» ºÙÀϼöÀÖ´Â ÃÖ¼Ò´ÜÀ§°¡ ¾Æ¸¶ panelÀÏ°ÍÀÔ´Ï´Ù.
ÀÛÀº component(button,label,list...)µéÀ» ÀÏ´Ü panel¿¡
ºÙÀÎÈÄ ±×panelÀ» appletÀ̸é appletÀ̶ó´Â ¶Ç ´Ù¸¥ panel¿¡,
applicationÀ̶ó¸é frame¿¡ panelÀ» ºÙÀÌ¸é µË´Ï´Ù.
ÀÌ panelÀ» ºÙÀÌ´Â ¹æ½ÄÀÌ ¹Ù·Î LayoutÀÎ °ÍÀÔ´Ï´Ù.
¿øÇϽô ´ë·Î´Â ¾ÈµÇ¾ú°ÚÁö¸¸ ³ª¸§´ë·Î ½ÇÇàÀº µË´Ï´Ù.
Á÷Á¢ º¸¼¼¿ä.
Âü, À§ÀÇ source code¸¦ º¸¸é Lable clableÀº ¼±¾ð¸¸
ÇØ ³õ°í Ãʱâȸ¦ ½ÃŲ°÷Àº ¾ø±º¿ä.
ÀÌ·¸µíÀÌ ¼±¾ð¸¸ Çسõ°í ³ªÁß¿¡ ±× °´Ã¼¸¦ ÂüÁ¶(»ç¿ë)ÇÏ·ÁÇϸé NullPointExceptionÀÌ ¹ß»ýÇÕ´Ï´Ù.
init()ºÎºÐ¸¸ ±âÀÔ--
.
..
line01= new Panel(new GridLayout(1,2));
line02= new Panel(new GridLayout(1,2));
line03= new Panel(new GridLayout(1,2));
panel_button= new Panel(new GridLayout(1,2));
....
Panel total= new Panel( new GridLayout());
total.add(line01);
total.add(line02);
total.add(line03);
total.add(panel_button);
add(total);
}//initÀÇ ³¡
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