```
public int coinChange(int[] coins, int amount) {
if(amount == 0)
return amount;
int[] dp = new int[amount + 1];
Arrays.fill(dp,Integer.MAX_VALUE);
dp[0] = 0;
for(int coin: coins){
for(int i = coin;i<=amount;i++){
if(dp[i - coin] != Integer.MAX_VALUE)
dp[i] = Math.min(dp[i-coin] + 1,dp[i]);
}
}
return dp[amount] == Integer.MAX_VALUE ? -1:dp[amount];
}
```