ObjectInputStream

  1 package Aug14.IO;
  2
  3
  4
  5 import java.io.*;
  6 import java.util.*;
  7 import java.util.Map.Entry;
  8
  9 class Student<T> implements Serializable{
 10     private T rollNo;
 11
 12     Student(T rollNo){
 13         this.rollNo=rollNo;
 14     }
 15
 16     private String Name;int age;
 17
 18     public void setRollNo(T roll){
 19         rollNo=roll;
 20     }
 21
 22     public T getRollNo(){
 23         return rollNo;
 24     }
 25
 26     public void setName(String roll){
 27         Name=roll;
 28     }
 29
 30     public String getName(){
 31         return Name;
 32     }
 33
 34     public void setAge(int roll){
 35         age=roll;
 36     }
 37
 38     public int getAge(){
 39         return age;
 40     }
 41
 42     public String toString(){
 43         return "Name:- "+getName()+" Age:- "+getAge();
 44     }
 45 }
 46
 47
 48 public  class StudDataFile {
 49
 50     private void objectWriter(Map<String, Student<Integer>> m) {
 51         try{
 52             File f=new File("D:\\Students.txt");
 53             ObjectOutputStream oos=new ObjectOutputStream(
 54                     new FileOutputStream(f,true));
 55             oos.writeObject(m);
 56             oos.flush();
 57             oos.close();
 58             System.out.println("File Writing Success");
 59         }catch(Exception e){
 60             e.printStackTrace();
 61         }
 62     }
 63
 64     private void objectReader(){
 65         try{
 66             File f=new File("D:\\Students.txt");
 67             ObjectInputStream ois=new ObjectInputStream(new FileInputStream(f));
 68
 69             Map<String, Student<Integer>> m=(Map<String, Student<Integer>>)ois.readObject();
 70
 71             Set view=m.entrySet();
 72             Iterator it=view.iterator();
 73             while(it.hasNext())
 74             {
 75                 Map.Entry<String, Student<Integer>> stud = (Entry<String, Student<Integer>>) it.next();
 76                 System.out.println("Key:- "+stud.getKey()+"\tValues:- "+stud.getValue());
 77             }
 78             ois.close();
 79         }catch(Exception e){
 80             e.printStackTrace();
 81         }
 82         System.out.println("File Reading Success");
 83     }
 84
 85     public static void main(String[] args) {
 86         Map<String, Student<Integer>> stuData=new HashMap<String, Student<Integer>>();
 87
 88         Student<Integer> s;
 89         for(int i=0; i<5; i++){
 90             s=new Student<Integer>(i+1);
 91             s.setName("Student: "+(i+1));
 92             s.setAge(20);
 93             stuData.put("st"+(i+1),s);
 94         }
 95
 96         StudDataFile sf=new StudDataFile();
 97         sf.objectWriter(stuData);
 98         sf.objectReader();
 99     }
100
101 }

ObjectInputStream