L2J Server

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public float getPercentFromCurrentLevel(long exp, int level)
{
	long expPerLevel = getExpForLevel(level);
	long expPerLevel2 = getExpForLevel(level + 1);
	return (float) (exp - expPerLevel) / (expPerLevel2 - expPerLevel);
}

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activeChar.removeExpAndSp(activeChar.getExp() - ExperienceData.getInstance().getExpForLevel(20), 0);

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if(iCharLevel != 85)
{
	long l_ExpForLvl = ExperienceData.getInstance().getExpForLevel(iCharLevel);
	long l_ExpForLvlInc = ExperienceData.getInstance().getExpForLevel(iCharLevel+1);
	
	long lTempExp;
													
	lTempExp = l_ExpForLvl;
	
	while(lTempExp < l_ExpForLvlInc)
	{
		float fGetNewPercent = ExperienceData.getInstance().getPercentFromCurrentLevel(lTempExp, iCharLevel);
		String strNewPercent = String.format("%.2f", fGetNewPercent);
		
		if(strPercent.equals(strNewPercent) )
		{
			activeChar.addExpAndSp(lTempExp - l_ExpForLvl, 0); //set percantage
			activeChar.sendMessage(strPercent);
			break;
		}
		
		lTempExp += 1; // inc works only for int in Java, so I used this method
	}
}

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//lVar1=char lvl (long value, presented as exp)
//lVar2=char lvl+1 (long value, presented as exp)
//fVar3=percent from old lvl, or manual (float value, presented as %.4f in canculations)

if((lVar1<=85)&&(lVar1>1)) long lPercResult=(((((lVar1-lVar2)/100)*(long)(fVar3*10000)))/100);//maybe require diff %.5f

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//Example: now u can use it for your characters' new lvl as additional operation
activeChar.addExpAndSp(lPercResult, 0);

//or make it as fast canculator for lvl down operation with % saving
activeChar.addExpAndSp((activeChar.getExp()-ExperienceData.getInstance().getExpForLevel(lvl))+lPercResult); //lvl up + %