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//ä¿åéæºæ°
int num=-1;
//çæµç次æ°
int flg=0;
//å¦æç¨æ·æ¯ç¬¬ä¸æ¬¡è¿å
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if(session.isNew())
{
//çæ0-100ä¹é´çéæºæ°
num=(int)(Math.random()*101);
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session.setAttribute("num",num);
}
else
{
num=Integer.parseInt(session.getAttribute("num").toString());
}