Java IO Streams file copying
In keyboard reading, three programs are given using DataInputStream, BufferedReader and Scanner. Of all, using java.util.Scanner is the easier and includes many methods to check the input data is valid to read. Example on Keyboard Input DataInputStream Following program uses readLine() method of DataInputStream to read data from the keyboard. import java.io.*; public class KeyboardReading1 …
The previous program (KeyboardReading1.java) of reading keyboard input, using DataInputStream, raises a deprecation warning. To overcome this, in the following program, the readLine() method of BufferedReader is used. Example on Keyboard Input BufferedReader Java The following program takes input from keyboard to fill the array elements. The elements and their average are printed. import java.io.*; …
The Scanner class is placed in java.util package (not in java.io) to facilitate to take input for DS (Data structure) elements. The advantage of Scanner class is parsing is not required for keyboard input data which is required with DataInputStream (as in KeyboardReading1.java) and BufferedReader (as in KeyboardReading2.java). Scanner class can not only read from …
One of the features of Java is "robust". It does not allow the programmer, to the maximum extent, to commit mistakes. For example, giving the size of the array in array initialization is a compilation error. Java designers included many methods in Scanner class intended to check the input whether it is a byte, short, …
System.out.println() Not only the novices but also a few Programmers do not aware of the meaning of System.out.prinltn() statement. Following is the description of each word in the statement. What is System.out.println()? out is an object PrintStream class defined in System class. out is declared as public, static and final. println() is a method of …
Every programming language supports keyboard input. Different languages come with different styles but any style should connect to the operating system’s input mechanism – a carrier style OS uses to transport data from keyboard to CPU for processing. Java uses System class to connect to OS input mechanism. "in" is an object of InputStream used …
