- Java.io package classes
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- Java.io - ObjectInputStream
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- io - ObjectOutputStream.PutField
- Java.io - ObjectStreamClass
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- Java.io - StringReader
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- Java.io - Writer
- Java.io package extras
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- Java.io package Useful Resources
- Java.io - Discussion
Java.io.Console.readLine() Method
Description
The java.io.Console.readLine(String fmt, Object... args) method provides a formatted prompt, then reads a single line of text from the console.
Declaration
Following is the declaration for java.io.Console.readLine(String fmt, Object... args) method −
public String readLine(String fmt, Object... args)
Parameters
fmt
args
Return Value
This method returns the string containing the line read from the console, not including any line-termination characters or null if an end of the stream has been reached.
Exception
IllegalFormatException − If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions.
IOError − If an I/O error occurs.
Example
The following example shows the usage of java.io.Console.readLine(String fmt, Object... args) method.
package com.tutorialspoint; import java.io.Console; public class ConsoleDemo { public static void main(String[] args) { Console cnsl = null; String fmt = "%1$4s %2$5s %3$10s%n"; String alpha = null; try { // creates a console object cnsl = System.console(); // if console is not null if (cnsl != null) { // read line from the user input alpha = cnsl.readLine(fmt, "Enter","Alphabets: "); // prints System.out.println("Alphabets entered: " + alpha); } } catch(Exception ex) { // if any error occurs ex.printStackTrace(); } } }
Let us compile and run the above program, this will produce the following result −
Enter Alphabets: ABCDEFGHIJKLMNOPQRSTUVWXYZ Alphabets entered : ABCDEFGHIJKLMNOPQRSTUVWXYZ