Levelup, etc.

//                0        1       2       3       4       5       6       7       8       9
int[] lvlformula = {0000000,00000100,0000200,0000400,0000800,0001600,0003200,0006400,0012800,0025600
//               10       11      12      13      14      15      16      17      19      20
            0051200,01024000,0204800,0409600,0819200,1638600,3276800,6555200,0000000,0000000
    };
lvlformula=Math.pow(2, level+1);
//Levelup checker
if(exp*lvlforumula>level){
OR
if(exp>levels[level++]){
    levelup(stats);
    levelup=true;
}
if(levelup==true){
    g.drawString("Levelup! Level "+level+" achieved.", 50, 100);
    if(k!=0)levelup=false;
}

battleStep=randInt.nextInt(15)+10;

package gameTest;
public class Actions(){
    //int oldhp, oldmaxhp;
    //int hp, maxhp;
    double hperc;
    //int oldmp, oldmaxmp;
    //int mp, maxmp;
    double mperc;

    public static int[] levelup(int[] stats){
        //level, skillPTS, maxhp, hp, maxmp, mp
        //int[] stats = {0, 0, 0, 0, 0};
        //level++;
        stats[0]++;         //Update Level
        //skillPTS+=5;
        stats[1]+=5;            //Give five spendable skill points
        //hperc=oldmaxhp/oldhp;
        hperc=stats[2]/stats[3];    //Calculate HP %age
        //mperc=oldmaxmp/oldmp;
        mperc=stats[4]/stats[5];    //Calculate MP %age
        //maxhp=(int)(1.2*maxhp);
        stats[2]=(int)(1.2*stats[2]);   //Set new MaxHP
        //maxmp=(int)(1.2*maxmp);
        stats[4]=(int)(1.2*stats[4]);   //Set new MaxMP
        //hp=(int)(maxhp*hperc);
        stats[3]=(int)(1.2*hperc);  //Calculate new instantaneous HP
        //mp=(int)(maxmp*mperc);
        stats[5]=(int)(1.2*mperc);  //Calculate new instantaneous MP
        return stats;
    }
}

package gameTest;
public class Actions(){
    double hperc, mperc;
    public static int[] levelup(int[] stats){
        stats[0]++;         //Update Level
        stats[1]+=5;            //Give five spendable skill points
        hperc=stats[2]/stats[3];    //Calculate HP %age
        mperc=stats[4]/stats[5];    //Calculate MP %age
        stats[2]=(int)(1.2*stats[2]);   //Set new MaxHP
        stats[4]=(int)(1.2*stats[4]);   //Set new MaxMP
        stats[3]=(int)(stats[]*hperc);  //Calculate new instantaneous HP
        stats[5]=(int)(1.2*mperc);  //Calculate new instantaneous MP
        return stats;
    }
}