mmm.... i think its good

import java.util.Scanner;
public class Studentgrade {

	public static void main(String[] args) {
		int num_of_student ;
		
		Scanner input = new Scanner(System.in);
		System.out.println("Enter the  number of Student :");
		num_of_student = input.nextInt();
		
		
		String []name = new String [num_of_student] ;
		int array[] = new int [num_of_student];
		
		String upAvg ="" ;
		String dwnAvg ="" ;
		String exellent = "Exellent :";
		String veryGgood ="Very Good :";
		String good="Good :";
		String pass ="Pass :";
		String fail = "Fail :";
		int sum=0;
		int avg;
		int min = array[0]=100;
		int max = array[0]=0;
		String maxi = null;
		String mini =null ;
		
		
		
		        for ( int j = 0; j< array.length; j++ )
		        {
		        	System.out.println("Enter Student Name :");
		        	name[j]=input.next();
		        	
		        	System.out.println("Enter Student Grade :");
		        	array[j]=input.nextInt();
		        	
		        	sum=sum+array[j];
		        	
		        	if (array[j] > max) 
					{
						max = array[j];
						maxi=name[j];
					}
				
					if (array[j] < min)
					{
						min = array[j];
						mini= name[j];
					}

		        }
		        avg= sum/array.length ;
		        for (int j=0 ; j<array.length ; j++)
		        {
		        	switch (array[j]/10)
					{
					case 100:
					case 9 :
						exellent += "\n"+ name[j] + "\t" +array[j]+"\n";
						break;
					case 8 :
						veryGgood += "\n" + name[j] + "\t" +array[j] +"\n";	
						break ;		
					case 7 :
						good += "\n" + name[j] + "\t" +array[j] +"\n";	
						break;
					case 6:
					case 5:
						pass += "\n" + name[j] + "\t" +array[j] +"\n";
						break;
						default:
							fail +="\n" + name[j] + "\t" +array[j] +"\n";
						break;
					}
				
		        	if(array[j]>avg)
		        	{
		        		upAvg += name[j] +"\t"+ array[j]+"\n";	
		        	}
		        	else if (array[j]<avg)
		        	{
		        		dwnAvg += name[j] +"\t"+ array[j]+"\n";	
		        		
		        	}
		        	//System.out.println("value=\t"+ array[j]);
		        }
		        
		        System.out.println(" result = :");
				System.out.println(exellent +"\n"+ veryGgood +"\n"+ good +"\n"+ pass +"\n"+fail);
				System.out.println("Maximum Grade = "+ max +"\t" +maxi);
				System.out.println("Minimum Grade = "+ min +"\t"+mini);
		        
		        System.out.println("avg =" +avg);
		    
				System.out.println("ubove avg\n"+upAvg +"\n");
				System.out.println("under avg\n"+dwnAvg+"\n");
				
	}

}

mmm.... i think its good

import java.util.Scanner;
public class Studentgrade {

	public static void main(String[] args) {
		int num_of_student ;
		
		Scanner input = new Scanner(System.in);
		System.out.println("Enter the  number of Student :");
		num_of_student = input.nextInt();
		
		
		String []name = new String [num_of_student] ;
		int array[] = new int [num_of_student];
		
		String upAvg ="" ;
		String dwnAvg ="" ;
		String exellent = "Exellent :";
		String veryGgood ="Very Good :";
		String good="Good :";
		String pass ="Pass :";
		String fail = "Fail :";
		int sum=0;
		int avg;
		int min = array[0]=100;
		int max = array[0]=0;
		String maxi = null;
		String mini =null ;
		
		
		
		        for ( int j = 0; j< array.length; j++ )
		        {
		        	System.out.println("Enter Student Name :");
		        	name[j]=input.next();
		        	
		        	System.out.println("Enter Student Grade :");
		        	array[j]=input.nextInt();
		        	
		        	sum=sum+array[j];
		        	
		        	if (array[j] > max) 
					{
						max = array[j];
						maxi=name[j];
					}
				
					if (array[j] < min)
					{
						min = array[j];
						mini= name[j];
					}

		        }
		        avg= sum/array.length ;
		        for (int j=0 ; j<array.length ; j++)
		        {
		        	switch (array[j]/10)
					{
					case 100:
					case 9 :
						exellent += "\n"+ name[j] + "\t" +array[j]+"\n";
						break;
					case 8 :
						veryGgood += "\n" + name[j] + "\t" +array[j] +"\n";	
						break ;		
					case 7 :
						good += "\n" + name[j] + "\t" +array[j] +"\n";	
						break;
					case 6:
					case 5:
						pass += "\n" + name[j] + "\t" +array[j] +"\n";
						break;
						default:
							fail +="\n" + name[j] + "\t" +array[j] +"\n";
						break;
					}
				
		        	if(array[j]>avg)
		        	{
		        		upAvg += name[j] +"\t"+ array[j]+"\n";	
		        	}
		        	else if (array[j]<avg)
		        	{
		        		dwnAvg += name[j] +"\t"+ array[j]+"\n";	
		        		
		        	}
		        	//System.out.println("value=\t"+ array[j]);
		        }
		        
		        System.out.println(" result = :");
				System.out.println(exellent +"\n"+ veryGgood +"\n"+ good +"\n"+ pass +"\n"+fail);
				System.out.println("Maximum Grade = "+ max +"\t" +maxi);
				System.out.println("Minimum Grade = "+ min +"\t"+mini);
		        
		        System.out.println("avg =" +avg);
		    
				System.out.println("ubove avg\n"+upAvg +"\n");
				System.out.println("under avg\n"+dwnAvg+"\n");
				
	}

}

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