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Java read file Example

In this example we will show how to open and read a file in Java. There are many ways to do this, but we will show two of them. For this example, we will read the contents of a text file named “test_file.txt”. 1. Read a file using BufferedReader This is the most commonly-used method in order to read a ...

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java.io.InputStream – InputStream Java Example

In this example, we are going to talk about a very important Java class, InputStream. If you have even the slightest experience with programming in Java, chances are that you’ve already used InputStream in one of your programs, or one of its subclasses, like FileInputStream or BufferedInputStream. You see, java io inputstream is an abstract class, that provides all the ...

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How to copy a directory in Java

In this tutorial we are going to see how you can copy a directory in Java. The idea is very simple. You open the directory and you list the contents. Then you open the contents and examine them one by one. If the entry you are looking at is a File, you can copy it to the new location. If ...

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Decompress a GZIP File in Java example

In the previous tutorial we saw how to compress a File with the GZIP method. In this tutorial we are going to see how to decompress the File that was compressed with the GZIP method. Basically all you have to do to decompress a gzipped file is: Create a FileInputStream to the compressed File. Create a GZIPInputStream to the above ...

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How to Read an Object from File in Java

In the previous tutorial we saw how to write an Object to a file in Java. In this example we are going to see how to read an Object from the file that we’ve stored it earlier. Basically, to read an Object from a file, one should follow these steps: Open a FileInputStream to the file that you’ve stored the ...

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4 Ways to Copy File in Java

Although Java offers a class that can handle file operations, that is java.io.File, it doesn’t have a copy method that will copy a file to another. The copying action is an important one, when your program has to handle many file related activities. Nevertheless, there are several ways you can perform a file copying operation in Java and we will ...

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Tokenizer from FileReader example

In this example we shall show you how to get a tokenizer from a FileReader. The FileReader is a convenience class for reading character files. The constructors of this class assume that the default character encoding and the default byte-buffer size are appropriate. To get a tokenizer from a FileReader one should perform the following steps: Create a new FileReader, ...

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Read file with FileInputStream

With this example we are going to demonstrate how to read a File with a FileInputStream. The FileInputStream obtains input bytes from a file in a file system. In short, to read a File with a FileInputStream you should: Create a new File instance by converting the given pathname string into an abstract pathname. Create a FileInputStream by opening a ...

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Read file in byte array with FileInputStream

This is an example of how to read a File in a byte array using a FileInputStream. The FileInputStream obtains input bytes from a file in a file system. Reading a file in a byte array with a FileInputStream implies that you should: Create a new File instance by converting the given pathname string into an abstract pathname. Create a ...

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