Admin: 1 версия

2010-06-01T06:12:46Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:43Z

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== Console output with format ==



<source lang="java">

import java.io.Console;
import java.sql.SQLException;
public class MainClass {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
Console console = System.console();
if (console == null) {
System.err.println("sales: unable to obtain console");
return;
}
console.printf("%s ", "string");
}
}

</source>



== Console read Password ==



<source lang="java">

import java.io.Console;
import java.sql.SQLException;
public class MainClass {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
Console console = System.console();
if (console == null) {
System.err.println("sales: unable to obtain console");
return;
}
String password = new String (console.readPassword ("Enter password: "));
System.out.println(password);
}
}

</source>



== Java Console readLine ==



<source lang="java">

import java.io.Console;
import java.sql.SQLException;
public class MainClass {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
Console console = System.console();
if (console == null) {
System.err.println("sales: unable to obtain console");
return;
}
String username = console.readLine("Enter username: ");
System.out.println(username);
}
}

</source>



== Masking a password with the Console class ==



<source lang="java">

import java.io.Console;
public class Main {
public static void main(String[] args) {
Console console = System.console();
char passwordArray[] = console.readPassword("Enter your secret password: ");
console.printf("Password entered was: %s%n", new String(passwordArray));
}
}

</source>



== Password Prompting with java.io.Console ==



<source lang="java">

import java.io.Console;
import java.util.Arrays;
public class PasswordPromptingDemo {
public static void main(String[] args) {
Console console = System.console();
if (console == null) {
System.out.println("Console is not available");
System.exit(1);
}
char[] password = "mustang".toCharArray();
char[] passwordEntered = console.readPassword("Enter password: ");
if (Arrays.equals(password, passwordEntered)) {
System.out.println("\n Access granted \n");
Arrays.fill(password, " ");
Arrays.fill(passwordEntered, " ");
System.out.println("OK ...");
} else {
System.out.println("Access denied");
System.exit(1);
}
}
}

</source>



== Printing text with the Console class ==



<source lang="java">

import java.io.Console;
public class Main {
public static void main(String[] args) {
Console console = System.console();
console.printf("%s%n", "this is a test");
}
}

</source>



== Use Console class to read user input? ==



<source lang="java">

import java.io.Console;
import java.util.Arrays;
public class Main {
public static void main(String[] args) {
Console console = System.console();
String username = console.readLine("Username: ");
char[] password = console.readPassword("Password: ");
if (username.equals("admin") && String.valueOf(password).equals("secret")) {
console.printf("Welcome to Java Application %1$s.\n", username);
Arrays.fill(password, " ");
} else {
console.printf("Invalid username or password.\n");
}
}
}

</source>

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Java/JDK 6/Console - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010