text-files

I need to append text repeatedly to an existing file in Java. How do I do that? Are you doing this for logging purposes? If so there are several libraries for this . Two of the most popular are Log4j and Logback . Java 7+ If you just need to do this one time, the Files class makes this easy: try { Files.write(Paths.get("myfile.txt"), "the text".getBytes(), StandardOpenOption.APPEND); }catch (IOException e) { //exception handling left as an exercise for the reader } Careful : The above approach will throw a NoSuchFileException if the file does not already exist. It also does not append a

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I have to write a program that will read the names and balances from text file "balances.txt" and organize into a report that will then sum up the balances into a total. This is what the file contains: JAKIE JOHNSON,2051.59 SAMUEL PAUL SMITH,10842.23 ELISE ELLISON,720.54 I had originally written the code which gave me exactly what I wanted, but was told not use loops, arrays, or parseDouble . I've now tried the following, but I keep getting an error every time I used nextDouble . The code: import java.io.File; import java.text.NumberFormat; import java.text.DecimalFormat; import java.io

In my program I need to update the Balance column of the text file each time the user does a withdrawal. I used both the write methods as well as the append methods, but to no avail. Once the user has logged in, that particular line is stored in the array #PIN AccountNo Balance 1598 01-10-102203-0 95000 4895 01-10-102248-0 45000 9512 01-10-102215-0 125000 6125 01-10-102248 85000 The code: try{ BufferedWriter out = new BufferedWriter(new FileWriter(".\\AccountInfo.txt",true)); if (amount <= 0.0) { System.out.println("can only withdraw positive amount!"); transactionScreen(); } else if (this

How can I bind a WPF TextBlock to a text file? I want for the TextBlock to display the content of the file. You need to read the file into a string in memory and bind to that string instead. View model: class ViewModel { public string FileText { get; set; } public void ReadFile(string path) { FileText = File.ReadAllText(path); } } XAML: <TextBlock Text="{Binding FileText}"/> Jodrell If you want the text to be formatted my inline markup you could look at the sub-class of TextBlock I made here . There is a convertor between a String of xaml markup and an InlineCollection(actually a generic list

Text file: test1 test2 test3 test4 I want to write after "test2" - something. I tried first time to open the file and I read the position where is test2. After that I opened the text file in Append format but I don't know how to write on specific position. I must to use next commands or others in Visual Basic: for reading from a text file: Open Test_Filename For Input As # for appending in a text file: Open Test_Filename For Append As #3 Any helps will be great. Edit: LineNum = 1 LineRead = 0 Test_Filename ="path/test.txt" If Len(Dir$(Test_Filename)) = 0 Then MsgBox ("Cannot find the file")