input
Sample input:
Number of students: 4
Enter students’ name and marks:
Ali 45
Mamat 30
Suzi 56
Suzila 12

output:
Sample output:
Average marks = 35.65

Marks Above Average
===================
Ali (45)
Suzi (56)

Average Marks and Below
=======================
Mamat (30)
Suzila (12)


------------------coding----------------
import java.util.*;
class StudentMarks
{
private static Scanner sc = new Scanner(System.in);

public static void main (String[] args)
{
String[] student;
int[] marks;
int i, count;
int total = 0;
float avg = 0;

System.out.print("Number of Students: ");
count = sc.nextInt();
System.out.println();
System.out.println("Enter Student's name and marks: ");

for (i = 0; i < count; i++){
sc.next();
sc.nextInt();
}

System.out.println("average mark" + avg);
System.out.println();

System.out.println("List students with marks above the average");
System.out.println();
System.out.println("List students with average marks or below");
}
}

Question not very clear... if I guess from your topic title:

you can always always read a String from the scanner and then try to convert it to int

actually my question is.. how can i use 'java scanner' to differentiate integer and string when its all together been insert at one time.. for example..

System.out.println("Enter Student's name and marks: ");

so we must enter " edward 20"-----> 'edward' for name ----> '20' for marks

so how can i use java scanner to differentiate 'edward 20 ' whether 'edward' or '20' are string in order to put 'edward' into 'arrayname' and 20 into 'array marks'?

*arraymarks is integer array
*arrayname is string array

String str;
str = sc.next(); // will contain "Edward"
str = sc.next(); // will contain "20"

how to pass value 'edward' into arrayname?
how to pass value '20' into arraymarks?
in the end i must print out the list of student with mark above average and below average?

you could make a reference to the name and assign it to the arrayname, and same with the mark. as for the average, so something like

if (mark1 > average)
s.o.println("student is above average");
else if (mark1 < average)
s.o.println("student is below average");
esle if (mark1 == average)
s.o.println("the student has average grade");

or something like it. hope this helped a bit