How to use

console

method

in

java.lang.System

public InteractiveTask(VJTop app) {
  this.app = app;
  tty = System.err;
  console = System.console();
}

private InitConsole() {
  this.console = System.console();
  this.systemIn = null;
  this.systemOut = null;
}

public String call() throws IOException {
  Console console = System.console();
  if (console == null)    return null;    // no terminal
  char[] w = console.readPassword("Password:");
  if (w==null)    return null;
  return new String(w);
}

private static String askForPasswd(String filePath){
  Console cons = System.console();
  String passwd = null;
  if (cons != null){
    char[] p = cons.readPassword("%s", "Enter passphrase for " + filePath + ":");
    passwd = String.valueOf(p);
  }
  return passwd;
}

@Override
public char[] promptPassword( String fmt, Object... args )
{
  return System.console().readPassword( fmt, args );
}

@Override
public String readLine()
{
  return System.console().readLine();
}

@Override
public String promptLine( String fmt, Object... args )
{
  return System.console().readLine( fmt, args );
}

 System.out.print("Enter something:");
String input = System.console().readLine();

 import java.io.Console;
Console console = System.console();
String s = console.readLine();
int i = Integer.parseInt(console.readLine());

/** Constructor. */
private GridConsoleAdapter(Console delegate) {
  this.delegate = System.console();
  if (delegate == null)
    throw new NullPointerException("Console is not available.");
}

public char[] readPassword(String prompt) {
 Console console = System.console();
 char[] pass = console.readPassword(prompt);
 return pass;
}

private String getPassword()
{
  checkState(clientOptions.user != null, "Username must be specified along with password");
  String defaultPassword = System.getenv("PRESTO_PASSWORD");
  if (defaultPassword != null) {
    return defaultPassword;
  }
  java.io.Console console = System.console();
  if (console == null) {
    throw new RuntimeException("No console from which to read password");
  }
  char[] password = console.readPassword("Password: ");
  if (password != null) {
    return new String(password);
  }
  return "";
}

private static String promptForPassword(String passwordName, String commandLineOption, String envVarName) throws Exception {
  final Console console = System.console();
  if(console == null) {
    throw new Exception("Cannot allocate a console. Set env var "+envVarName+" or "+commandLineOption+" on commandline in that case");
  }
  return new String(console.readPassword("[%s]", passwordName+" password:"));
}

 private static String getPasswordFromConsole() {
  System.out.print("Please enter the keystore password: ");
  return new String(System.console().readPassword());
 }
}

 public class ConsoleDemo {
 public static void main(String[] args) {
  String[] data = { "\u250C\u2500\u2500\u2500\u2500\u2500\u2510", 
    "\u2502Hello\u2502",
    "\u2514\u2500\u2500\u2500\u2500\u2500\u2518" };
  for (String s : data) {
   System.out.println(s);
  }
  for (String s : data) {
   System.console().writer().println(s);
  }
 }
}

/** */
public static @Nullable GridConsoleAdapter getInstance() {
  Console console = System.console();
  return console == null ? null : new GridConsoleAdapter(console);
}

private void showWelcomeMessage() {
 final Console console = System.console();
 if (console == null) {
  return;
 }
 final PrintWriter writer =
   new PrintWriter(new OutputStreamWriter(System.out, StandardCharsets.UTF_8));
 WelcomeMsgUtils.displayWelcomeMessage(80, writer);
 writer.printf("Server %s started with query file %s. Interactive mode is disabled.%n",
        Version.getVersion(),
        queriesFile);
 writer.flush();
}

private DiagnosticsReporterProgress buildProgress()
{
  DiagnosticsReporterProgress progress;
  if ( System.console() != null )
  {
    progress = new InteractiveProgress( out, verbose );
  }
  else
  {
    progress = new NonInteractiveProgress( out, verbose );
  }
  return progress;
}

@Test
public void testGetMappedProperty_sun_stdout_encoding() {
  final PropertiesUtil pu = new PropertiesUtil(System.getProperties());
  Charset expected = System.console() == null ? Charset.defaultCharset() : StandardCharsets.UTF_8;
  assertEquals(expected, pu.getCharsetProperty("sun.stdout.encoding"));
}

@Test
public void testGetMappedProperty_sun_stderr_encoding() {
  final PropertiesUtil pu = new PropertiesUtil(System.getProperties());
  Charset expected = System.console() == null ? Charset.defaultCharset() : StandardCharsets.UTF_8;
  assertEquals(expected, pu.getCharsetProperty("sun.err.encoding"));
}