Why does this code run on nano but not on eclipse?

I wonder why this code works on nano on my Mac but not on eclipse.. I also do not understand why it does not run on eclipse although I know where the wrongs seemingly are..

public class randomnumber {

    public static void main (String [] args) {
        int n = integer.parseInt(args [0]);
        int m = Integer.parseInt(args[1]);

        random = (int) (Math.random() * (m - n + 1)+n);

        System.out.println(random);
        }
    }

Exception in thread "main" java.lang.Error: Unresolved compilation problems:

integer cannot be resolved

random cannot be resolved to a variable

random cannot be resolved to a variable

at Randomnumber.main(Randomnumber.java:5)