Java Program to Read Console Input

How to read a character input in java?

In Java, Console input is accomplished by reading from System.in. System.in refers to an object of type InputStream.
BufferedReader object is used to create a character stream. BufferedReader supports buffered input stream.

BufferedReader(Reader inputReader)

We can use read() method in BufferedReader to read a character. read method can throw IOException.

int read() throws IOException

Reading Console Input Characters Example:

// Reading a character in java program                                             
import java.io.*;                                                               
                                                                                
class ReadingConsoleInputTest {                                                 
 public static void main(String args[]) throws IOException{                     
  char ch;        
  //Creates Character input stream.                                                              
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));     
  System.out.println("Enter characters, char 'x' to exit.");                    
  //read characters in console input                                            
  do {                                                                          
   ch = (char) br.read();                                                       
   System.out.println(ch);                                                      
  } while(ch != 'x');                                                           
 }                                                                              
}     

Output:

Enter characters, char 'x' to exit.
a
a


b
b


c
c


d
d


x
x

How to read a string input in java?

readLine() method is used to read the string in the BufferedReader.

// Reading a string in java program                                                        
import java.io.*;                                                               
                                                                                
class ReadingStringTest {                                                       
 public static void main(String args[]) throws IOException{                     
  String str;                                                                   
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));     
  System.out.println("Enter strings. 'exit' to exit.");                         
  //reading string in console input                                             
  do {                                                                          
   str = br.readLine();                                                         
   System.out.println(str);                                                     
  } while(!str.equals("exit"));                                                 
 }                                                                              
}   

Output:

Enter strings. 'exit' to exit.
welcome to java!
welcome to java!
Reading console input string in java program
Reading console input string in java program
exit
exit

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