Java Console readPassword() Method

The readPassword() method of Java Console class reads a password or passphrase from the console with echoing disabled.

Syntax

Parameters

N/A (not applicable, not available)

Return value:

This method returns a character array which contains the password read from the console. It does not include the line termination character. If an end of the stream has been reached, this method will return null.

Exception:

IOError: If an I/O error occurs.

Example 1

import java.io.Console; 
class  ReadPassword
{ 
    public static void main(String args[])  
    {
          
        //Obtaining a reference to the console. 
        Console con = System.console(); 
          
        // Checking If there is no console available, then exit. 
        if(con == null)  
        { 
            System.out.print("No console available"); 
            return; 
        } 
//        
        //to read password and then display it 
        System.out.println("Enter the password: "); 
        char[] ch=con.readPassword(); 
        //Password save char type
  
        //converting char array into string 
        String pass = String.valueOf(ch); 
        System.out.println("Password is: " + pass); 
    } 
}

Output:

Enter the password: @javatpoint
Password is: @javatpoint

Example 2

import java.io.Console; 
class ReadLine
{ 
 public static void main(String args[])  
    { 
        String str; 
            //Obtaining a reference to the console. 
        Console con = System.console(); 
           // Checking If there is no console available, then exit. 
        if(con == null)  
        { 
            System.out.print("No console available"); 
            return; 
        } 
//          
        // Read a string and then display it. 
        str = con.readLine("Enter your name: "); 
        con.printf("Your name is: %s\n", str); 
  
        //to read password and then display it 
        System.out.println("Enter the password: "); 
        char[] ch=con.readPassword(); 
      //converting char array into string 
        String pass = String.valueOf(ch); 
        System.out.println("Your Password is: " + pass); 
    } 
} 

Output:

Enter the password: Rahul
Your name is: Rahul
Enter the password: rahul123
Your Password is: rahul123

Java Console readPassword(String fmt, Object args) Method

The readPassword(String fmt, Object args) method of Console class provides a formatted prompt, then reads a password from the console. The program can read user input from the command line without showing what the user is typing.

Syntax

Parameters

fmt: A format string as described in Format string syntax for the prompt text.

args: Arguments referenced by the format specifiers in the format string.

Return value:

Exception:

IllegalFormatException: If given the format string is incompatible and insufficient arguments.

Example 1

import java.io.Console;
public class ReadPass {
   public static void main(String[] args) {      
	   String str; 
	   String fmt=" ";
	   try {
       //Obtaining a reference to the console. 
       Console con = System.console(); 
         // Checking If there is no console available, then exit. 
       if(con == null)  
       { 
           System.out.print("No console available");
        // console is not available. please Run code on cmd.		   
           return; 
       } 
      
            // read line from the user input
			System.out.print("Your Name: ");
			
           str =con.readLine(fmt,"Your","Name: ");
            
            // prints
            System.out.println("Name is: " + str);
            
            // read password into the char array
			System.out.print("Show password, please Enter Press:");
			
            char[] pwd = con.readPassword(fmt,"Enter","Password: ");
            
            // prints
            System.out.println("Password is: "+pwd);
            }
       catch(Exception e) {
    	   System.out.println(e);
       }
         }    
          }

Output:

Your Name: Jony
Name is: Jony
Show password, please Enter Press:
Password is:
[C@1909752

Example 2

import java.io.Console;
public class NewPass {
   public static void main(String[] args) {      
	   String str; 
	   String fmt=" ";
	   try {
       //Obtaining a reference to the console. 
       Console con = System.console(); 
        
       // Checking If there is no console available, then exit. 
       if(con == null)  
       { 
           System.out.print("No console available"); 
           // console is not available. please Run code on cmd.
           return; 
       } 
      
            // read line from the user input
               System.out.print("Your Name: ");
           str =con.readLine(fmt,"Your","Name: ");
            
            // prints
            System.out.println("Name is: " + str);
            
            // read password into the char array
    		System.out.print("Show old password, please Enter Press:");
            char[] pwd = con.readPassword(fmt,"Enter","Password: ");
            
            // prints
            System.out.println("Password is: "+pwd);
            
            System.out.println("Update password: "); 
            char[] ch=con.readPassword(); 
      
            //converting char array into string 
            String pass = String.valueOf(ch); 
            System.out.println("New Password is: " + pass); 
            }
       catch(Exception e) {
    	   System.out.println(e);
       }
         }     }

Output:

Your Name: Rahul
Name is: Rahul
Show old password, please Enter Press:
Password is:
 [C@1909752
Update password: rahul1234
New Password is: rahul1234

Next TopicJava Console Class

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