对象已移动

可在此处找到该文档 How to Use Password Fields in Java – New Self New Life
New Self New Life
No Result
View All Result
  • Home
  • Entertainment
  • Celebrity
  • Cinema
  • Music
  • Digital Lifestyle
  • Social Media
  • Softwares
  • Devices
  • Home
  • Entertainment
  • Celebrity
  • Cinema
  • Music
  • Digital Lifestyle
  • Social Media
  • Softwares
  • Devices
New Self New Life
No Result
View All Result
Home Softwares

How to Use Password Fields in Java

by admin
3 years ago
in Softwares
Working with Regular Expressions in Java
Share on FacebookShare on Twitter


A password subject is a textual content part used to enter a password. This Java Swing part permits a person to enter their password whereas shielding it with black dots every time the person varieties a personality.

Java supplies the JPasswordField class in its API that builders can use to create a password subject. JPasswordField inherits from the JTextComponent class, which itself is a subclass of JComponent.

JTextComponent is the bottom class for all Swing textual content elements. It supplies customizable options akin to a mannequin, a view, and limitless redo and undo to its subclasses.

On this programming tutorial, builders will learn to create a password subject in Java and get a person’s enter and password.

Trying to be taught Java in a classroom or on-line course setting? We’ve got a tutorial itemizing a few of the Finest On-line Programs to Be taught Java to assist get you began.

The right way to Use JPasswordField in Java

To create a password subject, Java programmers must instantiate the JPasswordField class, like so:

JPasswordField passwordField = new JPasswordField();

In JPasswordField’s constructor, you possibly can move an int argument to outline the dimensions of the sector (columns) that you simply want to be proven on the display. Within the occasion you’re utilizing a structure supervisor, akin to BoxLayout, together with your button, the worth within the constructor will likely be ignored or overridden.

Right here is a few instance Java code displaying this in motion:

import javax.swing.*;
import java.awt.*;
 
class SimplePassword{
 
   public static void primary(String args[]){
 
       JFrame body = new JFrame();
       JPasswordField passwordField = new JPasswordField();
       JLabel label = new JLabel("Password subject is beneath"); // line 10
 
       body.setLayout(new BoxLayout(body.getContentPane(), BoxLayout.Y_AXIS));
       passwordField.setBorder(BorderFactory.createLineBorder(Coloration.pink));
       passwordField.setMinimumSize(new Dimension(75, 25));
       passwordField.setPreferredSize(new Dimension(150, 25));
       passwordField.setMaximumSize(new Dimension(250, 25));
      
       body.add(label); // line 18
       body.add(passwordField);
       body.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       body.setSize(400,400);
       body.setLocationRelativeTo(null);
       body.setVisible(true);
    }
}

The code above creates a password subject with a pink border line:

Java Password Field Example

Be aware of traces 10 to 18 of the code above; your code would nonetheless be capable to run with out these traces. Nonetheless, you wouldn’t actually be capable to see the password subject in your program window. The one factor that might enable you establish it will be the blinking cursor in your display.

Due to this fact, to assist a person simply establish the place the password subject is, you want to set a coloured border for it. In any other case, it should mix in with the window’s background, making it unseeable. The setborder() technique helps obtain this.

Moreover, you want to set the minimal, most popular, and most measurement of your password subject utilizing setMinimumSize(), setPreferredSize(), setMaximumSize(), respectively. If programmers don’t set these values, they are going to have sizing points with their password subject. You possibly can attempt commenting out these strategies within the code above to see how your passfield resizes.

If it’s the solely part on the body, it’s possible you’ll not even be capable to establish the place it’s if these sizes will not be set.

Learn: Finest Instruments for Distant Builders

Dealing with Occasions on Password Fields in Java

From the earlier instance, in the event you tried coming into a password after which urgent the Enter key, you’ll discover that nothing occurs. It is because no motion has been configured for when a person has completed coming into their password.

In a sensible state of affairs, your person ought to give you the chance ship their password to a database or file for storage or verification. You possibly can add a button to pay attention for occasions and affiliate them with a password subject to deal with this process.

To realize this, you want to be certain that your occasion dealing with class implements the ActionListener interface. Subsequent, you want to register an occasion of this class to the button utilizing addActionListener().

Lastly, you want to present the code that may deal with the enter password within the actionPerformed(ActionEvent e) technique. This technique is all the time known as every time an occasion is fired up from an related part (e.g a button).

The Java code instance beneath demonstrates the above ideas. It shows the enter password on the terminal every time a person presses the Submit button:

import javax.swing.*;
import java.awt.*;
import java.awt.occasion.*;
import javax.swing.BorderFactory;
 
class PasswordField implements ActionListener {
 
   non-public JPasswordField passwordField = new JPasswordField();
 
   PasswordField (){
 
       JFrame body = new JFrame();              
       JLabel label = new JLabel("Enter Password");
       JButton button = new JButton("Submit");
       button.addActionListener(this);
    
       body.setLayout(new BoxLayout(body.getContentPane(), BoxLayout.Y_AXIS));
       passwordField.setBorder(BorderFactory.createLineBorder(Coloration.pink));
       passwordField.setPreferredSize(new Dimension(150, 25));
       passwordField.setMaximumSize(new Dimension(250, 25));
 
       body.add(label);
       body.add(passwordField);
       body.add(button);
 
       body.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       body.setSize(400,400);
       body.setLocationRelativeTo(null);
       body.setVisible(true);
   }
 
   public void actionPerformed(ActionEvent e) {
 
       char[] pass1 = passwordField.getPassword();
       System.out.println(pass1);
   }
      
   public static void primary(String args[]){
 
       PasswordField passwordObj = new PasswordField();
    }
}

This creates the graphical output:

Java Password Field Tutorial

Last Ideas on Java Password Fields

Password fields are used to seize non-public data. Because of this builders must pay explicit consideration to the safety of their class members. A technique of doing that is to make use of the non-public visibility modifier to make sure that different courses don’t unnecessarily entry members of this class.

Learn extra Java programming and software program growth guides.



Source link

Tags: FieldsJavaPassword
Previous Post

How to Build a JavaScript Search [Article]

Next Post

22-Year-Old Woman Vanishes After Party In California – One Day After Kiely Rodni

Related Posts

BrowserStack launches Figma plugin for detecting accessibility issues in design phase
Softwares

BrowserStack launches Figma plugin for detecting accessibility issues in design phase

by admin
July 22, 2025
Developer beats AI in coding battle
Softwares

Developer beats AI in coding battle

by admin
July 21, 2025
React latest version – React 19 to bring the React Compiler & more
Softwares

React latest version – React 19 to bring the React Compiler & more

by admin
July 20, 2025
Cross Exchange Crypto Arbitrage Bot: Automating the Trade
Softwares

Cross Exchange Crypto Arbitrage Bot: Automating the Trade

by admin
July 19, 2025
Improvements and crash fixes – Vivaldi Android Browser snapshot 3756.4
Softwares

Improvements and crash fixes – Vivaldi Android Browser snapshot 3756.4

by admin
July 18, 2025
Next Post
22-Year-Old Woman Vanishes After Party In California – One Day After Kiely Rodni

22-Year-Old Woman Vanishes After Party In California - One Day After Kiely Rodni

YouTube Expands Access to Audience Behavior Insights, Adds New Creative Tools for Community Posts

YouTube Expands Access to Audience Behavior Insights, Adds New Creative Tools for Community Posts

  • Trending
  • Comments
  • Latest
How to use Redis for Api Caching in CS-Cart

How to use Redis for Api Caching in CS-Cart

July 26, 2023
I Tried Calocurb For 90 Days. Here’s My Review.

I Tried Calocurb For 90 Days. Here’s My Review.

January 8, 2025
Sunny Pawar now: What happened to the Lion actor and what is he doing now? | Explainer

Sunny Pawar now: What happened to the Lion actor and what is he doing now? | Explainer

November 30, 2024
10 Best Netflix Original Thriller Shows, Ranked

10 Best Netflix Original Thriller Shows, Ranked

June 22, 2025
Scrapped ‘VH III’ Sequel Had ‘Really Good’ Songs

Scrapped ‘VH III’ Sequel Had ‘Really Good’ Songs

March 23, 2023
Yeat Claims He Met an Alien When He Was Kid and It Talked to Him

Yeat Claims He Met an Alien When He Was Kid and It Talked to Him

July 7, 2023
The Simpsons Producer Apologizes To Fans For Killing Off 35-Year-Old Character

The Simpsons Producer Apologizes To Fans For Killing Off 35-Year-Old Character

April 26, 2024
Bones: All Of Brennan’s Interns, Ranked

Bones: All Of Brennan’s Interns, Ranked

June 15, 2021
You’re Not a True Sci-Fi Fan Until You’ve Seen This Forgotten 16-Year-Old Series With 86% on RT

You’re Not a True Sci-Fi Fan Until You’ve Seen This Forgotten 16-Year-Old Series With 86% on RT

July 24, 2025
Bob and Brad iNeck Pro review – Get ready to relax with this neck massager

Bob and Brad iNeck Pro review – Get ready to relax with this neck massager

July 23, 2025
Lindsey Buckingham, Stevie Nicks’ Pre-Fleetwood Mac LP Set For Reissue

Lindsey Buckingham, Stevie Nicks’ Pre-Fleetwood Mac LP Set For Reissue

July 23, 2025
Doctor who supplied Matthew Perry ketamine set to enter guilty plea – National

Doctor who supplied Matthew Perry ketamine set to enter guilty plea – National

July 23, 2025
What Entrepreneurs Can Learn From Susie Hewson’s 40-Year Fight for Sustainability

What Entrepreneurs Can Learn From Susie Hewson’s 40-Year Fight for Sustainability

July 23, 2025
Ozzy Osbourne death: Tributes pour in for Black Sabbath rocker after he died age 76

Ozzy Osbourne death: Tributes pour in for Black Sabbath rocker after he died age 76

July 23, 2025
LinkedIn Shares Brand Building Tips for B2B Marketers

LinkedIn Shares Brand Building Tips for B2B Marketers

July 23, 2025

2025 XXL Freshman Cypher With BabyChiefDoIt, Ian, Lazer Dim 700

July 22, 2025
New Self New Life

Your source for entertainment news, celebrities, celebrity news, and Music, Cinema, Digital Lifestyle and Social Media and More !

Categories

  • Celebrity
  • Cinema
  • Devices
  • Digital Lifestyle
  • Entertainment
  • Music
  • Social Media
  • Softwares
  • Uncategorized

Recent Posts

  • You’re Not a True Sci-Fi Fan Until You’ve Seen This Forgotten 16-Year-Old Series With 86% on RT
  • Bob and Brad iNeck Pro review – Get ready to relax with this neck massager
  • Lindsey Buckingham, Stevie Nicks’ Pre-Fleetwood Mac LP Set For Reissue
  • Home
  • Disclaimer
  • DMCA
  • Privacy Policy
  • Cookie Privacy Policy
  • Terms and Conditions
  • Contact us

Copyright © 2021 New Self New Life.
New Self New Life is not responsible for the content of external sites. slotsfree  creator solana token

No Result
View All Result
  • Home
  • Entertainment
  • Celebrity
  • Cinema
  • Music
  • Digital Lifestyle
  • Social Media
  • Softwares
  • Devices

Copyright © 2021 New Self New Life.
New Self New Life is not responsible for the content of external sites.

New Self New Life