Computer scienceProgramming languagesJavaWorking with dataIO streams

Input streams

Reading Bytes from Java File

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What are the possible correct actions to read an array of bytes from a file into a Java program using FileInputStream?

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FileInputStream fileStream = new FileInputStream("input.txt");
ArrayList<byte[]> byteArray = new ArrayList<>();
byteArray.add(fileStream.read());

File file = new FileInputStream("input.txt");
byte[] byteArray = new byte[file.length()];
file.read(byteArray);

FileInputStream fileStream = new FileInputStream("input.txt");
byte[] byteArray = new byte[100];
fileStream.read(byteArray);

FileInputStream fileStream = new FileInputStream("input.txt");
byte[] byteArray;
fileStream.read(byteArray);

FileInputStream fileStream = new FileInputStream(new File("input.txt"));
byte[] byteArray = new byte[100];
int bytesRead = fileStream.read(byteArray);

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