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Java Exercises: Input and display your password

Java Basic: Exercise-42 with Solution

Write a Java program to input and display your password.

Pictorial Presentation:

Java: Input and display your password

Sample Solution:

Java Code:

import java.io.Console;
public class Example42 {
	public static void main(String[] args) {
		Console cons;
		if ((cons = System.console()) != null) {
			char[] pass_ward = null;
			try {
				pass_ward = cons.readPassword("Input your Password:");
				System.out.println("Your password was: " + new String(pass_ward));
			} finally {
				if (pass_ward != null) {
					java.util.Arrays.fill(pass_ward, ' ');
				}
			}
		} else {
			throw new RuntimeException("Can't get password...No console");
		}
	}
}

Sample Output:

Input your Password:                                                    
Your password was: [email protected]

Flowchart:

Flowchart: Java exercises: Input and display your password

Java Code Editor:

Contribute your code and comments through Disqus.

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Next: Write a Java program to print the following string in a specific format .

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Java: Tips of the Day

Try and catch:

Java is excellent at catching errors, but it can only recover gracefully if you tell it what to do. The cascading hierarchy of attempting to perform an action in Java starts with try, falls back to catch, and ends with finally. Should the try clause fail, then catch is invoked, and in the end, there's always finally to perform some sensible action regardless of the results. Here's an example:

try {
        cmd = parser.parse(opt, args); 
       
        if(cmd.hasOption("help")) {
                HelpFormatter helper = new HelpFormatter();
                helper.printHelp("Hello ", opt);
                System.exit(0);
                }
        else {
                if(cmd.hasOption("shell") || cmd.hasOption("s")) {
                String target = cmd.getOptionValue("tgt");
                } // else
        } // fi
} catch (ParseException err) {
        System.out.println(err);
        System.exit(1);
        } //catch
        finally {
                new Hello().helloWorld(opt);
        } //finally
} //try

It's a robust system that attempts to avoid irrecoverable errors or, at least, to provide you with the option to give useful feedback to the user. Use it often, and your users will thank you!

Ref: https://red.ht/3EZc9OC