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 }
