java - reading/writing variables from text files to variables -

i need make system storing customer information , quotations external file entering more customers, listing customers, , same quotations. need link quotations/customers id. need sql in java. however, need input , output system, , writing info array. have got 2 main pieces of code inefficient , need suggestions, improvements or entirely different system. input file code:

import java.io.*; //import classes import java.util.arraylist;  import java.util.iterator; public class mytextreader{    public static void main(string[] args){     string mydirectory = system.getproperty("user.dir");     string fulldirectory = mydirectory + "\\mytext.txt";     string input_line = null;        arraylist<string> textitems = new arraylist<string>(); //create array         list     try{         bufferedreader re = new bufferedreader(new filereader(fulldirectory));         while((input_line = re.readline()) != null){             textitems.add(input_line); //add item array list         }     }catch(exception ex){            system.out.println("error: " + ex);     }        iterator myiteration = textitems.iterator(); //use iterator cycle list        while(myiteration.hasnext()){ //while items exist          system.out.println(myiteration.next()); //print item command-line        }    }     } 

output file

import java.io.filewriter; //import classes import java.io.printwriter; public class mytextwriter{     public static void main(string[] args){         filewriter writeobj; //declare variables (uninstantiated)         printwriter printobj;              string mytext = "hello text file";          try{ //risky behaviour – catch errors                 writeobj = new filewriter("c:\\documents\\mytext.txt" , true);            printobj = new printwriter(writeobj);//create both objects            printobj.println(mytext);  //print file            printobj.close(); //close stream           }catch(exception ex){        system.out.println("error: " + ex);           }          }    } 

for reading text file

    filereader fr = new filereader("yourfile.txt");             bufferedreader br = new bufferedreader(fr);             string s="";             s=br.readline(); system.out.println(s); 

for writting text file

printwriter writetext = new printwriter("yourfile.txt", "utf-8");         writetext.println("the first line");         writetext.println("the second line");         writetext.close();