this is my code and used java8 :- for coin change problem

public static String CoinChange(int input1,int[] input2) { return CoinChange(input1,input2,0,new HashMap()); }

public static String CoinChange(int input1,int[] input2,int a, HashMap<String,Long> memo)
{
    int b = 1;
    int c = 0;
    long d = 0;
    String x = "";
    if(input1 == 0)
    {
        return (x = String.valueOf(b));
    }
    if(a >= input2.length)
    {
        return (x = String.valueOf(c));
    }

    String z = input1+"-"+a;

    if(memo.containsKey(z))
    {
       d = memo.get(z);
       return (x = String.valueOf(d));
    }
    int e = 0;
    long f = 0;

    while(e <= input1)
    {
        int g = input1 - e;
        f += CoinChange(input2, g, a+1,memo);
        e += input2[a];
    }
    memo.put(z,f);
    return(x = String.valueOf(f));


    and i was getting a error which is
    CandidateCode.java:43: error: incompatible types: int[] cannot be converted to int
        f += CoinChange(input2, g, a+1,memo);


        can anyone please solve this