Question

trying to learn and practice arrays but I have a problem with this small example. Can someone please help me please? Thank you

public class Homework1{
public static void main(String[] args){
    int[] anArray={ 1,2,3,4,5,6,7,8,9};

    System.out.println(anArray.length);
    int min=0;
    int max=0;

    for(int i=0; i<anArray.length; i++){
        if(anArray[i].compareTo(anArray[min]) < 0)
            min=i;

        if(anArray[i].compareTo(anArray[max]) > 0)
            max=i;
    }

    System.out.println(max);
    System.out.println(min);
}
}

And I am getting this error message:

int cannot be dereferenced
        if(anArray[i].compareTo(anArray[min]) < 0)
int cannot be dereferenced
        if(anArray[i].compareTo(anArray[max]) > 0)

Thank you.

Answer 1

CompareTo will not work with Premitive type. You can use comparator operator.

public class TestArray  {

public static void main(String[] args)  {
int[] anArray={ 1,2,3,4,5,6,7,8,9};

System.out.println(anArray.length);
int min=0;
int max=0;

for(int i=0; i<anArray.length; i++){
    if(anArray[i] <(anArray[min]) )
        min=i;

    if(anArray[i]>(anArray[max]) )
        max=i;
}

System.out.println(max);
System.out.println(min);
}
}