To read raw data bytes from images, audio, video, etc., utilise an input stream. The FileReader class allows for reading character streams, which can also be read using character-stream data.<\/p>\n
An application can read raw data from the input stream in a machine-independent manner thanks to the Java DataInputStream class.<\/p>\n
Typically, a Java application writes data to the data output stream so that a data input stream can read it later.<\/p>\n
Syntax<\/strong><\/p>\n DataInputStream(InputStream in) uses the underlying InputStream to create a DataInputStream.<\/p>\n <\/p>\n Output<\/strong> Output<\/strong> Output<\/strong> In Java, DataInputStream is essentially used to read data from the input stream passed into the constructor as a file as an argument. It is capable of reading all Java primitive data types.<\/p>\n","protected":false},"excerpt":{"rendered":" To read raw data bytes from images, audio, video, etc., utilise an input stream. The FileReader class allows for reading character streams, which can also be read using character-stream data. Explanation An application can...<\/p>\n","protected":false},"author":6,"featured_media":447258,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[183],"tags":[5532,321,296,322,323,5531,263,327,250],"class_list":["post-89825","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-datainputstream-class","tag-datainputstream-class-in-java","tag-java","tag-java-datainputstream","tag-java-datainputstream-class","tag-java-datainputstream-class-with-example","tag-java-tutorial-for-beginners","tag-java-tutorials","tag-learn-java"],"yoast_head":"\nInputStream in =newDataInputStream(InputStream in);\r\n<\/pre>\n
Constructor<\/h3>\n
Method<\/h3>\n
\n\n
\n Method<\/strong><\/td>\n Description<\/strong><\/td>\n<\/tr>\n \n read(byte[] b)<\/span><\/td>\n Reads a predetermined number of bytes from the contained input stream and stores them in buffer array b.<\/span><\/td>\n<\/tr>\n \n read(byte[] b, int off, int len)<\/span><\/td>\n Reads data from the contained input stream up to length bytes and stores it in an array.<\/span><\/td>\n<\/tr>\n \n readBoolean()<\/span><\/td>\n Reads a single input byte, returns false if the byte is zero, and true otherwise.<\/span><\/td>\n<\/tr>\n \n readChar()<\/span><\/td>\n Returns a char value after reading two input bytes.<\/span><\/td>\n<\/tr>\n \n readByte()<\/span><\/td>\n Returns a byte value after reading one input byte.<\/span><\/td>\n<\/tr>\n \n readFloat()<\/span><\/td>\n Returns a float value after reading four input bytes.<\/span><\/td>\n<\/tr>\n \n readFully()<\/span><\/td>\n Read the number of bytes in the byte array.<\/span><\/td>\n<\/tr>\n \n readDouble()<\/span><\/td>\n Returns a double value after reading eight bytes of input.<\/span><\/td>\n<\/tr>\n \n readInt()<\/span><\/td>\n Returns an int value after reading four input bytes.<\/span><\/td>\n<\/tr>\n \n readLine()<\/span><\/td>\n Reading a text line<\/span><\/td>\n<\/tr>\n \n readLong()<\/span><\/td>\n Returning a long value after reading eight input bytes<\/span><\/td>\n<\/tr>\n \n readShort()<\/span><\/td>\n Return a short value after reading two input bytes.<\/span><\/td>\n<\/tr>\n \n readUnsignedByte()<\/span><\/td>\n Read a byte, then give back an integer.<\/span><\/td>\n<\/tr>\n \n readUnsignedShort()<\/span><\/td>\n After reading two input bytes, an integer array is returned.<\/span><\/td>\n<\/tr>\n \n skipBytes()<\/span><\/td>\n Skips n bytes of the input stream’s data.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \n\n
\n Sno<\/strong><\/td>\n \u00a0 \u00a0 Method\u00a0<\/strong><\/td>\n \u00a0 Description\u00a0<\/strong><\/td>\n<\/tr>\n \n 1<\/strong><\/td>\n public final int read(byte[] r, int off, int len)throws IOException<\/span><\/td>\n Reads data from the input stream up to len bytes into an array of bytes. gives back the total number of bytes that were read into the buffer; if the file is at the end, it returns -1.<\/span><\/td>\n<\/tr>\n \n 2<\/strong><\/td>\n Public final int read(byte [] b)throws IOException<\/span><\/td>\n Reads a small number of bytes from the inputstream and puts them in the byte array. returns -1 if the file is at the end, otherwise returns the total number of bytes read into the buffer.<\/span><\/td>\n<\/tr>\n \n 3<\/strong><\/td>\n \n \n
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These methods will read the bytes from the contained InputStream. gives back the next two InputStream bytes as the designated primitive type.<\/span><\/td>\n<\/tr>\n \n 4<\/strong><\/td>\n public String readLine() throws IOException<\/span><\/td>\n Opens the input stream and begins reading the next line of text. The characters read are returned as a String after it reads consecutive bytes, translating each byte into a character one at a time until it comes across a line terminator or file end.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Example<\/h4>\n
import java.io.*;\r\npublic class TechVidvan {\r\n public static void main(String args[])throws IOException \r\n{\r\n\r\n DataOutputStream dataOut = new DataOutputStream(new FileOutputStream(\"E:\\\\file.txt\"));\r\n dataOut.writeUTF(\"welcome to TechVidvan tutorials\");\r\n\r\n DataInputStream dataIn = new DataInputStream(new FileInputStream(\"E:\\\\file.txt\"));\r\n\r\n while(dataIn.available()>0) {\r\n String k = dataIn.readUTF();\r\n System.out.print(k+\" \");\r\n }\r\n }\r\n}<\/pre>\n
\nwelcome to TechVidvan tutorials<\/p>\nExample<\/h4>\n
import java.io.*; \r\npublic class TechVidvan\r\n{ \r\n public static void main(String[] args) throws IOException \r\n{ \r\n InputStream input = new FileInputStream(\"D:\\\\testout.txt\"); \r\n DataInputStream inst = new DataInputStream(input); \r\n int count = input.available(); \r\n byte[] ary = new byte[count]; \r\n inst.read(ary); \r\n for (byte bt : ary) \r\n{ \r\n char k = (char) bt; \r\n System.out.print(k+\"-\"); \r\n } \r\n } \r\n }<\/pre>\n
\nJ-A-V-A<\/p>\nExample<\/h4>\n
import java.io.FileInputStream;\r\nimport java.io.InputStream;\r\nclass Main\r\n {\r\n public static void main(String args[])\r\n {\r\n\r\n byte[] array = new byte[100];\r\n\r\n Try\r\n {\r\n InputStream input = new FileInputStream(\"input.txt\");\r\n\r\n System.out.println(\"Bytes in file: \" + input.available());\r\n input.read(array);\r\n System.out.println(\"Data read : \");\r\n\r\n\r\n String data = new String(array);\r\n System.out.println(data);\r\n\r\n input.close();\r\n } \r\ncatch (Exception e)\r\n {\r\n e.getStackTrace();\r\n }\r\n }\r\n}<\/pre>\n
\nBytes in file:<\/strong> 16
\nData read:<\/strong>
\nJava programming<\/p>\nConclusion<\/h3>\n