The Java DataInputStream class enables a program to retrieve primitive data from an input stream in a manner that is independent of the underlying machine.
In Java programming, a common practice is to utilize the DataOutputStream to store data that can be retrieved later using a DataInputStream.
Java DataInputStream class declaration
Now, let's examine the declaration of the java.io.DataInputStream class:
Example
public class DataInputStream extends FilterInputStream implements DataInput
Java DataInputStream class Methods
| Method | Description |
|---|---|
| int read(byte[] b) | It is used to read the number of bytes from the input stream. |
| int read(byte[] b, int off, int len) | It is used to readlenbytes of data from the input stream. |
| int readInt() | It is used to read input bytes and return an int value. |
| byte readByte() | It is used to read and return the one input byte. |
| char readChar() | It is used to read two input bytes and returns a char value. |
| double readDouble() | It is used to read eight input bytes and returns a double value. |
| boolean readBoolean() | It is used to read one input byte and return true if byte is non zero, false if byte is zero. |
| int skipBytes(int x) | It is used to skip over x bytes of data from the input stream. |
| String readUTF() | It is used to read astringthat has been encoded using the UTF-8 format. |
| void readFully(byte[] b) | It is used to read bytes from the input stream and store them into the bufferarray. |
| void readFully(byte[] b, int off, int len) | It is used to readlenbytes from the input stream. |
Example of DataInputStream class
In this instance, we are retrieving information from the testout.txt file.
Example
package com.example;
import java.io.*;
public class DataStreamExample {
public static void main(String[] args) throws IOException {
InputStream input = new FileInputStream("D:\\testout.txt");
DataInputStream inst = new DataInputStream(input);
int count = input.available();
byte[] ary = new byte[count];
inst.read(ary);
for (byte bt : ary) {
char k = (char) bt;
System.out.print(k+"-");
}
}
}
In this scenario, it is presumed that the data is present in a file named "testout.txt":
Output:
Output
J-A-V-A
