Remove unbalanced parentheses in a given expression, Java

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Remove unbalanced parentheses in a given expression.
    Eg.) Input  : ((abc)((de))
         Output : ((abc)(de))   or (abc)((de))

Input  : (((ab)
         Output : (ab)

*/
import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        Scanner input=new Scanner(System.in);
        System.out.println("Enter the expression:");
        String expression=input.next();
        int openParentheses[]=new int[100];
        int closeParentheses[]=new int[100];
        int toBeRemoved[]=new int[100];
        int opIt=0,cpIt=0,toBeRemovedIt=0;        
        for(int i=0;i<expression.length();i++)
        {
            if(expression.charAt(i)=='(')
            {
                openParentheses[opIt]=i;
                opIt++;
            }
            if(expression.charAt(i)==')')
            {
                closeParentheses[cpIt]=i;
                cpIt++;
            }
            
        }
       /* for(int i=0;i<opIt;i++)
            System.out.print(openParentheses[i]+" ");
        
        for(int i=0;i<cpIt;i++)
            System.out.print(closeParentheses[i]+" ");*/
        int greather=(opIt>cpIt)?1:2;   // 1=openParentheses higher 2=closeParentheses higher
        int ParenthesesDiff=Math.abs(opIt-cpIt);
        //System.out.print("ParenthesesDiff:"+ParenthesesDiff+"greather : "+greather);
        
        
        for(int i=0;i<ParenthesesDiff;i++)
        {
            if(greather==1)
            {
                opIt--;
                toBeRemoved[toBeRemovedIt]=openParentheses[opIt];
                toBeRemovedIt++;
            }
            else if(greather==2)
            {
                cpIt--;
                toBeRemoved[toBeRemovedIt]=closeParentheses[cpIt];
                toBeRemovedIt++;
            }
        }
        
    /*    for(int i=0;i<toBeRemovedIt;i++)
            System.out.print(toBeRemoved[i]+" ");
    */
        for(int i=0;i<expression.length();i++)
        {
            
        }
    }
    
}

[ - ] Show input
Compilation time: 1.04 sec, absolute running time: 0.28 sec, cpu time: 0.29 sec, memory peak: 20 Mb, absolute service time: 1,33 sec