Hi Friend,

Try the following code:

import java.util.*;

public class StudentResult{
    String studentID;
    String name;
    double assignment;
    double presentation;
    double test;
    double exam;
    double total;
    String grade;
public void setStudentID(String studentID){
    this.studentID=studentID;
}
public String getStudentID(){
    return studentID;
}
public void setName(String name){
this.name=name;
}
public String getName(){
    return name;
}
public void setAssignment(double assignment){
this.assignment=assignment;
}
public double getAssignment(){
    return assignment;
}
public void setPresentation(double presentation){
this.presentation=presentation;
}
public double getPresentation(){
    return presentation;
}

public void setTest(double test){
this.test=test;
}
public double getTest(){
    return test;
}
public void setExam(double exam){
this.exam=exam;
}
public double getExam(){
    return exam;
}
public void setTotal(double total){
this.total=total;
}
public double getTotal(){
    return total;
}
public void setGrade(String grade){
this.grade=grade;
}
public String getGrade(){
    return grade;
}
public static void main(String[]args){
    Scanner input=new Scanner(System.in);
    int menu = 0;
System.out.println("Student Result");
System.out.println();
System.out.println("1. Add a student");
System.out.println("2. Exit");
boolean quit = false;
do{
System.out.print("Please enter your choice: ");
menu = input.nextInt();
System.out.println();

switch(menu) {
    case 1:
StudentResult data[]=new StudentResult[2];
for (int i=0; i<data.length; i++) {
    int j=i+1;
System.out.println("********Student "+j+"*********");
System.out.println("Enter Matric No");
            String no=input.next();
            System.out.println("Enter Name: ");
            String n=input.next();
            System.out.println("Enter Assignment marks");
            double m1=input.nextDouble();
            System.out.println("Enter Presentation marks");
            double m2=input.nextDouble();
            System.out.println("Enter Test marks");
            double m3=input.nextDouble();
            System.out.println("Enter Exam marks");
            double m4=input.nextDouble();
            double tm=.20*m1+.10*m2+.10*m3+.60*m4;
            System.out.println("Total Marks="+tm);
            data[i] = new StudentResult();
data[i].setStudentID(no);
data[i].setName(n);
data[i].setAssignment(m1);
data[i].setPresentation(m2);
data[i].setTest(m3);
data[i].setExam(m4);
data[i].setTotal(tm);
if(tm<40){
data[i].setGrade("Fail");
}
if(tm>40&&tm<60){
    data[i].setGrade("D");
}
if(tm>60&&tm<70){
    data[i].setGrade("C");
}
if(tm>70&&tm<90){
    data[i].setGrade("B");
}
if(tm>90){
    data[i].setGrade("A");
}
}
for(int i=0;i<2;i++){
      StudentResult show = data[i];
      String ide=show.getStudentID();
      String nn=show.getName();
        double as=show.getAssignment();
          double pr=show.getPresentation();
            double tt=show.getTest();
              double ee=show.getExam();
                double tot=show.getTotal();
                 String g = show.getGrade();
      System.out.println(ide + "  " + nn + "  " + as+"  "+pr+"  "+tt+"  "+ee+"  "+tot+"  "+g);
      }
      break;
      case 2:
          quit = true;
break;
default:
System.out.println("Invalid Entry!");
 }
}
while (!quit);
}
}

Thanks