Jul 4, 2012 · Process pr = Runtime.getRuntime().exec("java -version"); BufferedReader in = new BufferedReader(new InputStreamReader(pr.getInputStream())); String line; while ((line = in.readLine()) != null) { System.out.println(line); pr.waitFor(); …

Nov 13, 2016 · You're trying to read your file using a classloader by invoking the getClass().getResource(...) methods rather than reading the file using classes that access the file system directly. For example, if you had written your test like this: callSomeCode(); File file = new File("src/test/resources/img/dest/someImage.gif"); assertTrue(file.exists());

Here is the way to go: InputStreamReader(proc.getInputStream())); InputStreamReader(proc.getErrorStream())); System.out.println(s); Read the Javadoc for more details here. ProcessBuilder would be a good choice to use.

Jan 8, 2024 · In this tutorial, we’ll explore different ways to read from a File in Java. First, we’ll learn how to load a file from the classpath, a URL, or from a JAR file using standard Java classes. Second, we’ll see how to read the content with BufferedReader, Scanner, StreamTokenizer, DataInputStream, SequenceInputStream, and FileChannel. We will ...

Jan 4, 2025 · There are several ways to read a plain text file in Java e.g. you can use FileReader, BufferedReader, or Scanner to read a text file. Every utility provides something special e.g. BufferedReader provides buffering of data for fast reading, and Scanner provides parsing ability.

May 11, 2024 · Learn how to process lines in a large file efficiently with Java - no need to store everything in memory.

Learn how to effectively read InputStream in Java when using Runtime.exec() or ProcessBuilder with code examples.

Read a File. In the previous chapter, you learned how to create and write to a file. In the following example, we use the Scanner class to read the contents of the text file we created in the previous chapter:

In this Java tutorial, we will explore different ways to read a text file into String in Java from traditional BufferedReader, new APIs in Java 8 and 11 to third-party libraries such as Apache Commons Lang and Guava.

BufferedReader processes that 1MB test file with just 32 read calls – a massive 475x reduction! Overall runtime drops from 20+ seconds to around 100 milliseconds – over 200x faster! By reducing disk thrashing, buffering provides immense speedups.