Question

int i = 0;
Float[] arr =null;
Float arr2 [] = null;
Iterator itr = minMaxVal.keySet().iterator();
while(itr.hasNext()){
    arr = minMaxVal.get(i);
    arr2[i] = (float) arr[0];
    i++;
}
java.util.Arrays.sort(arr2);
return arr2[0];

It throws an NulPointException at arr2[i] = (float) arr[0];

How can overcome this. Thank You in advance….

Answer 1

all the values in arr are null. Converting a null value into a primitive float would obviously fail. as in the statement arr2[i] = (float) arr[0]; first initialize the array arr and then do the assignment