It is important to discuss input-output streams as it is used while implementing System.in.read().
io stream we have java.io package.System.in.read(byte[])
System is a class in java.lang package.in is a static data member in the system class of type input stream class. Input stream class belongs java.io package. read byte[] is available in the input stream class.
System indicates the current computer system.in indicates standard input device System.in.read indicates reading from a standard input device.Note:
- It is compulsory to use
read(byte[])of input stream-class try-catch because it throws a checked exception IOexception.- So, an alternative instead of try-catch is using
throws java.io.IOException.
Let’s look at the code below:
class Input{public static void main(String args[])throws java.io.IOException{byte b[]=new byte[50];System.in.read(b);String s =new String(b);System.out.println(s);}}
Enter the input below
Input class in Java.throws java.io.IOException to avoid the IO exception while reading user-input.byte class using byte b[]=new byte[50]; System.in.read(b);String s =new String(b);and display the output .Let’s look at the code below:
import java.io.IOException;class Main{public static void main(String args[]){byte b[]=new byte[50];try{System.in.read(b);}catch(IOException ioe){System.out.println(ioe);}String s=new String(b);// Converts byte into stringSystem.out.println(s);}}
Enter the input below
Line 2: We create an Main class in Java.
Line 6: We create the object of the byte class using byte b[]=new byte[50];
Lines 7 to 10: We read the user-input using System.in.read(b); using a try-block.
Lines 10 to 12:The program where the exception occurs is placed in the try block, and the type of exception is placed inside the catch block.
Lines 14 to 16:
We convert the bytes of user input into a
string using
String s =new String(b) and display the output.