Dear Friends I am sharing a java program with all of u which I built a few years back. I guess it will help beginners. It uses java utill package to store data in a flat file. The File Name-----phone.java
{ System.out .println("Enter the 'ID', 'q' for quit _linenums:0'>import java .io .*;import java .util .*;import java.awt.event.*;public class phone { public void new_record() { String id,name,city,add,number,total,list; boolean bln=false; try { Properties pr=new Properties(); FileInputStream fin=new FileInputStream("phone.dat"); if(fin!=null) { pr.load(fin); } BufferedReader br1=new BufferedReader (new InputStreamReader(System.in)); FileOutputStream fout=new FileOutputStream("phone.dat"); for(; { System.out .println("Enter the 'ID', 'q' for quit:"); id=br1.readLine().toUpperCase(); bln=pr.containsKey(id); System.out .println("FLag"+bln); if(bln) { System.out.println("ID id already exists, Please Enter another ID:"); continue; } if((id.toUpperCase()).equals("Q")) break; System.out.println("enter name:"); name=br1.readLine().toUpperCase(); System.out.println("enter Phone number:"); number=br1.readLine().toUpperCase(); System.out.println("enter address:"); add=br1.readLine().toUpperCase(); System.out.println("enter city:"); city=br1.readLine().toUpperCase(); total=" Name="+name+","+"Phone no="+number+","+" Address="+add+","+" City="+city; total=total.toUpperCase(); pr.put(id,total); pr.store(fout,"My Telephone Book"); } fout.close(); } catch(Exception e) { System.out.println(e); } } public void display_record() { String id=""; String total=""; int x=1; try { FileInputStream fin=new FileInputStream("phone.dat"); Properties pr1=new Properties(); pr1.load(fin); Enumeration enum1=pr1.keys(); while(enum1.hasMoreElements()) { id=enum1.nextElement().toString(); total=pr1.get(id).toString(); StringTokenizer stk=new StringTokenizer(total,"=,"); System.out .println("RECORD ::"+x+"\n"); x++; while(stk.hasMoreTokens()) { String key=stk.nextToken(); String value=stk.nextToken(); System.out.println("\t"+key+"::\t\t::"+value); try { Thread.sleep(1500); } catch(Exception e){} } System.out.println(""); System.out.println(""); } fin.close(); } catch(Exception e){} } public void display_by_name() { String name="",id,total; String key[]=new String[4]; String value[]=new String[4]; int i=0; System.out.println("Enter Name For Searching Record :-"); try { BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); name=br.readLine().toUpperCase(); FileInputStream fin=new FileInputStream("phone.dat"); Properties pr1=new Properties(); pr1.load(fin); Enumeration enum1=pr1.keys(); while(enum1.hasMoreElements()) { id=enum1.nextElement().toString(); total=pr1.get(id).toString(); StringTokenizer stk=new StringTokenizer(total,"=,"); while(stk.hasMoreTokens()) { for(i=0;i<4;i++) { key[i]=stk.nextToken(); value[i]=stk.nextToken(); } if(value[0].equals(name)) { for(i=0;i<4;i++) { System.out.println("\t"+key[i]+":"+value[i]); try { Thread.sleep(1500); } catch(Exception e){} } } } System.out.println(""); } fin.close(); } catch(Exception e){ System.out.println(e); }} public void display_by_city() { String city="",id,total; String key2[]=new String[4]; String value2[]=new String[4]; int i=0; System.out.println("Enter City For Searching Record :-"); try { BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); city=br.readLine().toUpperCase(); FileInputStream fin=new FileInputStream("phone.dat"); Properties pr1=new Properties(); pr1.load(fin); Enumeration enum1=pr1.keys(); while(enum1.hasMoreElements()) { id=enum1.nextElement().toString(); total=pr1.get(id).toString(); StringTokenizer stk=new StringTokenizer(total,"=,"); while(stk.hasMoreTokens()) { key2[i]=stk.nextToken(); value2[i]=stk.nextToken(); // System.out.println("aaaaaaaaaaaaaaa"+value2[i]); if(i==3) { if(value2[i].equals(city)) { for(int j=0;j<4;j++) { System.out.println("\t"+key2[j]+":\t"+value2[j]); try { Thread.sleep(1500); } catch(Exception e){} } } } i++; if(i>3) i=0; } System.out.println(""); System.out.println(""); } fin.close(); } catch(Exception e){ System.out.println(e); } }public void display_record_first_letter() { String name="",id,total,str=""; String key2[]=new String[4]; String[] value2=new String[4]; int i=0; try { BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); System.out.println(" Enter The First Letter Of any Name:"); name=br.readLine(); name=name.substring(0,1).toUpperCase(); FileInputStream fin=new FileInputStream("phone.dat"); Properties pr1=new Properties(); pr1.load(fin); Enumeration enum1=pr1.keys(); while(enum1.hasMoreElements()) { id=enum1.nextElement().toString(); total=pr1.get(id).toString(); StringTokenizer stk=new StringTokenizer(total,"=,"); while(stk.hasMoreTokens()) { for(i=0;i<4;i++) { key2[i]=stk.nextToken(); value2[i]=stk.nextToken(); } str=value2[0].substring(0,1); if(str.equals(name)) { for(i=0;i<4;i++) { System.out.println("\t"+key2[i]+":\t"+value2[i]); try { Thread.sleep(1500); } catch(Exception e){} } } } System.out.println(""); System.out.println(""); } fin.close(); } catch(Exception e){ System.out.println(e); }} public void replace_record() { String id,name,city,add,number,total,list; boolean bln=false; try { Properties pr=new Properties(); FileInputStream fin=new FileInputStream("phone.dat"); if(fin!=null) { pr.load(fin); } BufferedReader br1=new BufferedReader (new InputStreamReader(System.in)); FileOutputStream fout=new FileOutputStream("phone.dat"); for(; { System.out .println("Enter the 'ID', 'q' for quit:"); id=br1.readLine().toUpperCase(); if((id.toUpperCase()).equals("Q")) break; bln=pr.containsKey(id); if(bln) { System.out.println("ID id already exists, "); System.out.println("enter name:"); name=br1.readLine().toUpperCase(); System.out.println("enter Phone number:"); number=br1.readLine().toUpperCase(); System.out.println("enter address:"); add=br1.readLine().toUpperCase(); System.out.println("enter city:"); city=br1.readLine().toUpperCase(); total=" Name="+name+","+"Phone no="+number+","+" Address="+add+","+" City="+city; total=total.toUpperCase(); pr.put(id,total); pr.store(fout,"My Telephone Book"); } else { System.out.println("ID does'nt Exists, Please Enter A Valid ID:"); continue; } } pr.store(fout,"My Phone Book"); fout.close(); } catch(Exception e) { System.out.println(e); } } public void delete_record() { String id=""; boolean bln=false; try { Properties pr1=new Properties(); FileInputStream fin=new FileInputStream("phone.dat"); if(fin!=null) pr1.load(fin); BufferedReader br1=new BufferedReader (new InputStreamReader(System.in)); FileOutputStream fout=new FileOutputStream("phone.dat"); for(; { System.out .println("Enter the 'ID', 'q' for quit:"); id=br1.readLine().toUpperCase(); if((id.toUpperCase()).equals("Q")) break; bln=pr1.containsKey(id); if(bln) { System.out.println("ID exists :"); String str=pr1.remove(id).toString(); pr1.store(fout,"My Phone Book"); try { Thread.sleep(1500); } catch(Exception e){} System.out.println("Record deleted successfully"); } else { System.out.println("Enter Existing ID:"); pr1.store(fout,"My Phone Book"); } } pr1.store(fout,"My Phone Book"); fin.close(); fout.close(); } catch(Exception e) { System.out.println(e); } } public void menu() { char ch=30; char ch1=31; int l; for(int i=0;i<27;i++) { System.out.print(" "); } for(l=0;l<2;l++) { for(int j=0;j<38;j++) { System.out.print(ch); } System.out.println(""); for(int k=0;k<27;k++) { System.out.print(" "); } } System.out.print(ch); System.out.print(ch1); for(int i=0;i<34;i++) System.out.print(" "); System.out.print(ch); System.out.print(ch1); System.out.println(""); for(int i=0;i<27;i++) System.out.print(" "); System.out.print(ch); System.out.print(ch1+" "); System.out.print (" 1. Enter new Record: "); System.out.print(" "+ch); System.out.println(ch1+" "); for(int i=0;i<26;i++) System.out.print(" "); System.out.print(" "+ch1); System.out.print(ch+" "); System.out.print (" 2. Display All Record: "); System.out.print(" "+ch); System.out.println(ch1+" "); for(int i=0;i<26;i++) System.out.print(" "); System.out.print(" "+ch); System.out.print(ch1+" "); System.out.print (" 3. Search Record by name: "); System.out.print(" "+ch); System.out.println(ch1+" "); for(int i=0;i<26;i++) System.out.print(" "); System.out.print(" "+ch); System.out.print(ch1+" "); System.out.print (" 4. Search Record by city: "); System.out.print(" "+ch); System.out.println(ch1+" "); for(int i=0;i<26;i++) System.out.print(" "); System.out.print(" "+ch); System.out.print(ch1+" "); System.out.print (" 5. Search Record by 1st letter:"); System.out.print(" "+ch); System.out.println(ch1+" "); for(int i=0;i<26;i++) System.out.print(" "); System.out.print(" "+ch); System.out.print(ch1+" "); System.out .print(" 6. Replace Record: "); System.out.print(" "+ch); System.out.println(ch1+" "); for(int i=0;i<26;i++) System.out.print(" "); System.out.print(" "+ch); System.out.print(ch1+" "); System.out .print(" 7. Delete Record: "); System.out.print(" "+ch); System.out.println(ch1+" "); for(int i=0;i<26;i++) System.out.print(" "); System.out.print(" "+ch); System.out.print(ch1+" "); System.out .print(" 8. Exit: "); System.out.print(" "+ch); System.out.println(ch1+" "); for(int j=0;j<27;j++) System.out.print(" "); System.out.print(ch); System.out.print(ch1); for(int i=0;i<34;i++) System.out.print(" "); System.out.print(ch); System.out.print(ch1); System.out.println(""); for(int i=0;i<27;i++) System.out.print(" "); for(int i=0;i<38;i++) System.out.print(ch); System.out.println(""); for(int i=0;i<27;i++) System.out.print(" "); for(int i=0;i<38;i++) System.out.print(ch); } public static void main (String[] args) { phone cl=new phone(); BufferedReader br; for(; { try { cl.menu(); br=new BufferedReader (new InputStreamReader(System.in)); System.out.print(" Enter Your Choice :"); String choice=br.readLine(); if(choice.equals ("1")) { cl.new_record(); } else if(choice.equals("2")) { cl.display_record(); } else if(choice.equals("3")) cl.display_by_name(); else if(choice.equals("4")) { cl.display_by_city(); } else if(choice.equals("5")) cl.display_record_first_letter(); else if(choice.equals("6")) cl.replace_record(); else if(choice.equals("7")) cl.delete_record(); else if(choice.equals("8")) System.exit(0); } catch(Exception e){} } }}
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