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package io;

import java.io.BufferedReader;

import java.io.Console;

import java.io.IOException;

import java.util.Arrays;

/**

*

* @author chengfeili

* Jun 14, 2017 3:18:58 PM

*

* The Console class is a singleton.

*

* This is a bug #122429 of eclipse

*

*/

public class IteractingWithUsers {

public void readLineTest() throws IOException {

Console console = System.console();

if (console == null) {

throw new RuntimeException("Console not available");

} else {

console.writer().print("How excited are you about your trip today? ");

/**

* Flushes the console and forces any buffered output to be written

* immediately .

*/

console.flush();

String excitementAnswer = console.readLine();

String name = console.readLine("Please enter your name: ");

Integer age = null;

console.writer().print("What is your age? ");

console.flush();

BufferedReader reader = new BufferedReader(console.reader());

String value = reader.readLine();

age = Integer.valueOf(value);

console.writer().println();

console.format("Your name is " + name);

console.writer().println();

console.format("Your age is " + age);

console.printf("Your excitement level is: " + excitementAnswer);

}

}

/**

* By disabling echoing, the user does not see the text they are typing.

*

* The readPassword() method returns an array of characters instead of a

* String. String values are added to a shared memory pool for performance

* reasons in Java. This means that if a password that a user typed in were

* to be returned to the process as a String , it might be available in the

* String pool long after the user entered it.

*/

public void readPasswordTest() {

Console console = System.console();

if (console == null) {

throw new RuntimeException("Console not available");

} else {

char[] password = console.readPassword("Enter your password: ");

console.format("Enter your password again: ");

console.flush();

char[] verify = console.readPassword();

boolean match = Arrays.equals(password, verify);

// Immediately clear passwords from memory

// Arrays.fill(password, 'x');

for (int i = 0; i < password.length; i++) {

password[i] = 'x';

}

for (int i = 0; i < verify.length; i++) {

verify[i] = 'x';

}

console.format("Your password was " + (match ? "correct" : "incorrect"));

}

}

public static void main(String[] args) {

}

}