is checking if a file object exists redudent and bad style when you have a try, catch block?

Is it overly redundant and considered bad style to check that the file object exists before a try catch. Since the FileNotFoundException would be called anyways if the file object did not exist? …

How to use SequenceInputStream?

šŸ³Background 1.I was learning the basic grammar of input and output in java. 2.But I found that the SequenceInputStream worked strangely. āš”Code package book1.chapter10; import java.io….

How can I remove last 2 lines in text file in Java?

I want remove last 2 lines in my text file using java. I tried 4 or 5 different ways about this, but I can’t find working code. I will edit file like this: [ { “example” } ] …

How to get rid of – ā€œjava.io.IOException: The system cannot find the path specifiedā€

I am trying to create a file and write to it, but I’m getting error in my path. Here is my code: @Value(“${base.location}”) private String folderName; if (StringUtils.isBlank(dateFileName)) …

Does commons-io’s FileUtils.readFileToByteArray close the newly created stream?

I’m creating a program that produce checksums for each files in directory. I’m using FileUtils.readFileToByteArray which internally creates a new FileInputStream. The problem is I didn’t find where …

How to save the matrix in the text file

I just want to input the matrix in the text file, but the result are clearly different. I don’t have any ideas. public void saveToTextFile() { try { BufferedWriter writer = new …

get removable sd card path in android

How can i get extSdcard path in android? There are 2 storage, first external storage in which all the phones have it but there is second storage which is called removable storage (micro sdcard). I …

Setting file permissions returns FALSE always

The code: File dir = new File(path); boolean rc1 = dir.setExecutable(true, false); boolean rc2 = dir.setReadable(true, false); boolean rc3 = dir.setWritable(true, false); if (!rc1 || !rc2 || !rc3){ …

How do I read / convert an InputStream into a String in Java?

If you have a java.io.InputStream object, how should you process that object and produce a String? Suppose I have an InputStream that contains text data, and I want to convert it to a String, so for …