overwrite | 易学教程

Overwriting txt file in java

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问题 The code I've written is supposed to overwrite over the contents of the selected text file, but it's appending it. What am I doing wrong exactly? File fnew=new File("../playlist/"+existingPlaylist.getText()+".txt"); String source = textArea.getText(); System.out.println(source); FileWriter f2; try { f2 = new FileWriter(fnew,false); f2.write(source); /*for (int i=0; i<source.length();i++) { if(source.charAt(i)=='\n') f2.append(System.getProperty("line.separator")); f2.append(source.charAt(i));

Java overloading vs overriding

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Hi I just want to make sure I have these concepts right. Overloading in java means that you can have a constructor or a method with different number of arguments or different data types. i.e public void setValue(){ this.value = 0; } public void setValue(int v){ this.value = v; } How about this method? Would it still be considered overloading since it's returning a different data type? public int setValue(){ return this.value; } Second question is: what is overriding in java? Does it relate to inheritance. Let's I have the following: public class Vehicle{ double basePrice = 20000; //constructor

WiX— always overwrite the previous version

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问题 I have an installer of an application that needs to install over any existing version, regardless of version number. Instead, I've got an installer that constantly says that I need to go to add/remove programs. That's very frustrating behavior for my testers, since it just slows them down for no real reason in their minds-- the previous installer package would always just install, deleting any files that were previously there, so they never had to do that step. We also have a (large) customer

Overwriting an existing Heroku app

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问题 I have a Sinatra app, hosted on Heroku. Lately, I've been developing that same app from a different folder. It's not a branch, it's just a parallel app / directory with identical contents but different code. I want to push this new app to Heroku, overwriting the app that's currently there. I don't want to merge the two locally, just continue from the new one while keeping the old. What's the proper command sequence for this? I have doubts about running heroku create , as that will result in a

MATLAB matfile increases in size when overwriting cell data

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问题 Due to large data size and frequent automatic saves I decided to change the method of saving from the standard save() function to partial saving using a matfile object: https://www.mathworks.com/help/matlab/ref/matfile.html I made this change because using save() will overwrite everything even if a minor change was made to the structure, greatly slowing the program. However I noticed that the time to save with matfile increased linearly every time it was called, and after some debugging I

How to copy certain files (w/o folder hierarchy), but do not overwrite existing files?

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问题 I need to copy all *.doc files (but not folders whose names match *.doc ) from a network folder \\server\source (including files in all nested folders) to a local folder C:\destination without preserving the nested folders hierarchy (i.e. all files should go directly into C:\destination and no nested folders should be created in C:\destination ). In case there are several files with the same name from different subfolders of \\server\source , only the first one should be copied and never

Read and overwrite a file in Python

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Currently I'm using this: f = open(filename, 'r+') text = f.read() text = re.sub('foobar', 'bar', text) f.seek(0) f.write(text) f.close() But the problem is that the old file is larger than the new file. So I end up with a new file that has a part of the old file on the end of it. nosklo If you don't want to close and reopen the file, to avoid race conditions, you could truncate it: f = open(filename, 'r+') text = f.read() text = re.sub('foobar', 'bar', text) f.seek(0) f.write(text) f.truncate() f.close() The functionality may also be cleaner and safer using with open as per mVChr's comment,

How can I overwrite/print over the current line in Windows command line?

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问题 On Unix, I can either use \\r (carriage return) or \\b (backspace) to overwrite the current line (print over text already visible) in the shell. Can I achieve the same effect in a Windows command line from a Python script? I tried the curses module but it doesn\'t seem to be available on Windows. 回答1: yes: import sys import time def restart_line(): sys.stdout.write('\r') sys.stdout.flush() sys.stdout.write('some data') sys.stdout.flush() time.sleep(2) # wait 2 seconds... restart_line() sys

How do I force “git pull” to overwrite local files?

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问题 How do I force an overwrite of local files on a git pull ? The scenario is following: A team member is modifying the templates for a website we are working on They are adding some images to the images directory (but forgets to add them under source control) They are sending the images by mail, later, to me I\'m adding the images under the source control and pushing them to GitHub together with other changes They cannot pull updates from GitHub because Git doesn\'t want to overwrite their