我正在尝试将多个联系人写入并保存到一个文件中,然后将其存储为十六进制文件,但它会不断创建多个文件(每个联系人一个).我试图移动：

System.out.print("Type a name for this file, followed by hitting 'enter': ");

String fName = kbReader.nextLine();

//append information to the string to be converted

utfString = name + "

" + pNumber + "

" + fact;

//outputs variables to file in hexadecimal format

PrintStream fileStream = new PrintStream(fName);

fileStream.println(toHex(utfString));

While循环中的“部分”部分,该部分将在用户说他们没有其他联系人要添加到文件之后创建文件.我要使用此代码的路径是,每个联系人都以十六进制代码形式写入文件,然后用户说他们想输入另一个联系人,因此程序在第一个联系人之后将新联系人以十六进制代码写入文件中.一.

码：

import java.util.Scanner;

import java.io.PrintStream;

import java.io.IOException;

public class Exercise27{

public static String toHex(String currString){

//converts a string to a byte-array

byte[] preConvert = currString.getBytes();

//converts byte-array to hexadecimal string using a function from the javax library included in Java Platform SE 7 and onwards

return javax.xml.bind.DatatypeConverter.printHexBinary(preConvert);

}

public static void main(String[] args) throws IOException{

//starts keyboard input

Scanner kbReader = new Scanner(System.in);

Boolean MoreContacts = true;

String More;

do{

//declare variable to convert to hex later on

String utfString = "";

//create variables for user-information

System.out.print("Type your full name, followed by hitting 'enter': ");

String name = kbReader.nextLine();

System.out.print("Type your phone number, followed by hitting 'enter': ");

String pNumber = kbReader.nextLine();

System.out.print("Type one interesting fact about yourself, followed by hitting 'enter': ");

String fact = kbReader.nextLine();

System.out.print("Type a name for this file, followed by hitting 'enter': ");

String fName = kbReader.nextLine();

//append information to the string to be converted

utfString = name + "

" + pNumber + "

" + fact;

//outputs variables to file in hexadecimal format

PrintStream fileStream = new PrintStream(fName);

fileStream.println(toHex(utfString));

System.out.println("More contacts? (Enter y or n)");

MoreContacts = false;

More = kbReader.nextLine();

System.out.println("More: " + More);

if((More.equalsIgnoreCase("y")) || (More.equalsIgnoreCase("yes")))

{

MoreContacts = true;

}

}while(MoreContacts);

PrintStream fileStream;

//close your systems

//fileStream.close();

kbReader.close();

}

}