Java Tutorial

Java Tutorial Java Features C++ vs Java Java History Java Hello World Java Development Kit Java Runtime Environment Java Virtual Machine Difference between JDK, JRE, and JVM Memory Areas in Java Java Operators Java Keywords Primitive Data Types Variables

Java Loops

Java Do While Loop Java While Loop Java For Loop Java Enhanced For Loop

Java Programs

Java Basic Programs Factorial Program in Java Fibonacci Series Program in Java Prime Number Program in Java Palindrome Number Program in Java Armstrong Number Program in Java Anagram Program in Java Pattern Programs in Java Calculator Program in Java Leap Year Program in Java Addition Program in Java Number Pattern Programs in Java Star Pattern Programs in Java Package Program in Java Pyramid Program in Java Sorting Program in Java String Palindrome Program in Java Even Odd Program in Java For Loop Program in Java If Else Program in Java Switch Case Program in Java GCD Program in Java LCM Program in Java Hello Program in Java Matrix Program in Java Menu Driven Program in Java Series Program in Java Client Server Program in Java Swapping Program in Java Pig Latin Program in Java Tower of Hanoi Program in Java Recursion Program in Java Matrix Multiplication Program in Java Perfect Number Program in Java Classes and Objects in Java Example Programs String Programs in Java Array Programs in Java Constructor Program in Java Inheritance Program in Java Abstract class Program in Java Interface Program in Java Encapsulation Program in Java Polymorphism Program in Java Exception Handling Program in Java Multithreading Program in Java Thread Program in Java Collection Programs in Java ArrayList Program in Java Stack Program in Java Applet Program in Java Swing Program in Java JDBC Program in Java How to run Java program in command prompt How to run Java program in Eclipse

Java Sorting

Sorting Algorithms in Java Merge Sort in Java Quick Sort in Java Bubble Sort in Java Insertion Sort in Java Selection Sort in Java Heap Sort in Java Radix Sort in Java Topological Sort in Java Bucket Sort in Java Counting Sort in Java

Java OOPs Concepts

OOPs - Object Oriented Programming Objects and Classes in Java Java Naming Conventions Constructors in Java Java this keyword Java static keyword Inheritance in Java Aggregation in Java Java super keyword Constructor Chaining and Constructor Overloading Java Polymorphism Static and Dynamic Binding in Java Java Abstraction Abstract class in Java Interface in Java Difference between Abstract class and Interface Java final keyword Packages in Java Access Modifiers in Java Java Wrapper classes Java Numbers Java Characters Java Integer Java Boolean Java Arrays Java Command Line Arguments Java strictfp Keyword Java Math

Java Strings

Java Strings Java String Methods StringBuilder in Java StringBuffer in Java Java Regular Expressions StringBuffer vs StringBuilder String vs StringBuffer String vs StringBuilder String Manipulation in Java Java String Concatenation How to Reverse a String in Java String Array in Java How to Compare Two Strings in Java How to Concatenate Two Strings in Java Why String in Immutable in Java java.lang.NumberFormatException for Input String String Pool in Java Java Generate Random String How to take String Input in Java Java String Interview Questions

Java Exceptions

Exception Handling in Java Java try catch Java throw Java throws Difference between throw and throws Java finally Java Custom Exception Java Exception Propagation

Garbage Collection

Automatic Resource Management in Java Java Garbage Collection Java finalize() Java gc() Difference between final, finally and finalize


Multithreading in Java Process and Thread in Java Basic Terms in Multithreading Java Thread creation Thread Scheduler in Java Java Thread class DeadLock in Java

Java IO

Java IO Java Read File Java BufferedWriter Java InputStreamReader Java File Java Read File Line By Line Java FileOutputStream Jar File in Java


Java Serialization Java transient


Java Network Programming Java Socket Programming Java URL Java URLConnection HttpURLConnection in Java Java InetAddress Java DatagramSocket and Java DatagramPacket


Java AWT


Swing in Java

Java Collections

Collections in Java Java List Interface ArrayList in Java LinkedList in Java Vector in Java Stack in Java ArrayList vs LinkedList in Java ArrayList vs Vector in Java Java Set Interface HashSet in Java LinkedHashSet in Java TreeSet in Java Java Queue Interface PriorityQueue in Java ArrayDeque in Java Java Map Interface HashMap in Java LinkedHashMap in Java TreeMap in Java Dictionary in Java Hashtable in Java Properties in Java Collections class in Java Java Comparable Java Comparator Comparable vs Comparator in Java

Java Generics

Generics in Java

Java Annotations

Annotations in Java


Java JDBC Tutorial

Java Differences

Java vs JavaScript Python vs Java Kotlin vs Java Java vs C++ C# vs Java Static vs Non-static in Java C vs Java int vs Integer in Java Stack vs Heap in Java Java Array vs ArrayList

How to

How to run Java program How to set path in Java How to check the Java version in cmd How to install Java in Windows 10 How to run Java program in cmd How to call a method in Java How to sort an array in Java How to iterate HashMap in Java How to write Java program How to create an array in Java How to create a package in Java How to generate random numbers in Java How to input String in Java How to create thread in Java How to find length of String in Java How to sort a string in Java How to use scanner in Java How to achieve multiple inheritance in Java How to run Java program in Eclipse How to call a function in Java How to create array of objects in Java How to create custom exception in Java How to achieve abstraction in Java How to call static method in Java

Java 8 Features

Java 8 Features Lambda Expressions in Java Functional Interface in Java Streams in Java Java Base64 Encoding and Decoding Parallel Arrays Sort in Java

Java 9 Features

Java 9 Tutorial Java 9 Try With Resources Java 9 Interface Private Method

Java Servlet Tutorial

Java Servlets Tutorial

Java JSP Tutorial

Java JSP Tutorial

Hibernate Tutorial

Hibernate Tutorial

Spring Tutorial

Spring Tutorial

Spring MVC Tutorial

Spring MVC Tutorial

Jenkins Tutorial

Jenkins Tutorial

Java Math Methods

Math.abs() Math.acos() Math.addExact() Math.asin() Math.atan () Math.atan2() Math.cbrt() Math.ceil() Math.copysign() Math.cos() Math.cosh() Math.decrementExact() Math.exp() Math.expm1() Math.floor() Math.floorDiv() Math.floorMod() Math.getExponent() Math.hypot() Math.IEEEremainder() Math.incrementExact() Math.log() Math.log10() Math.log1p() Math.max() Math.min() Math.multiplyExact() Math.multiplyFull() Math.negateExact() Math.nextAfter() Math.nextDown() Math.nextUp() Math.pow() Math.random() Math.rint() Math.round() Math.scalb() Math.signum() Math.sin() Math.sinh() Math.sqrt() Math.subtractExact() Math.tan() Math.tanh() Math.toDegrees() Math.toIntExact() Math.toRadians() Math.ulp()

Java String Methods

toCharArray() copyValueOf() endsWith() equals() equalsIgnoreCase() format() getBytes() getChars() hashCode() indexOf() intern() isEmpty() join() lastIndexOf() length() replace() replaceAll() replaceFirst() split() startsWith() subSequence() substring() toLowerCase() toUpperCase() trim() valueOf()

Java Conversion

Java Convert String to int Java Convert int to String Java Convert String to long Java Convert long to String Java Convert String to float Java Convert float to String Java Convert String to double Java Convert double to String Java Convert String to Date Java Convert Date to String Java Convert String to Object Java Convert Object to String Java Convert String to char Java Convert char to String Java Convert int to long Java Convert long to int


Functional Interfaces in Java Singleton class in Java Awesome explanation of Strings in Java Object class in Java Static class in Java All the important string methods in Java String Handling Method in Java What are Array strings in Java Advantages and Disadvantages of Strings in Java Big Decimal class in Java Class definition in Java Char and String differences in Java Difference between String, StringBuffer and StringBuilder in java Replace character in string Java String Coding Interview Questions in Java What is String in Java? String isnullorempty in Java String Matches in Java Trim Method in String Java Bean class in Java Libraries in Java Arithmetic Operations on String in Java Convert Char array to string in java Check whether Java is installed or not How to calculate time difference in Java How to stop execution after a certain time in Java Jagged Array in Java Java ArraylistRemove() Time Complexity Java Swing Time Picker Zigzag Array in Java

Swing Program in Java

Java Swing is part of Java Foundation Classes (JFC). The swing toolkit is used to generate Graphical User Interface (GUI) for programs written in Java. The Java swing API is more sophisticated and light-weight as compared to AWT (Abstract Window Toolkit). The swing API is also platform-independent. The swing program in Java demonstrates the usage to swing API in the program.

Swing Example

Let’s learn how to create a simple login page using Java Swing. The following program illustrates the same.


 // importing the important classes of the swing API
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class SwingExample
// driver method
public static void main(String argvs[])
               // Creating an object of the class JFrame with a title
               JFrame f = new JFrame("A basic login page");
               // providing the breadth and height of the frame
               f.setSize(325, 199);
               // to force the application to terminate, when the x button is pressed
               // Creating a panel. A frame can have many panels attached to it
               JPanel p = new JPanel();
               // Panel p has to be attached with the frame
               //invoking the custom method addComponents for providing components
               // to the panel p
               // Setting the visibility of the frame to true value
private static void addComponents(JPanel pnl)
               // Creating JLabel
               JLabel usrLabel = new JLabel("User Name");
               // The method setBounds() serves two purposes.
               // One purpoase is to specify the position of the label
               // by taking reference from the top left corner (10, 20) of the panel
               // Another purpose is to provide the size of the label (80, 25)
               // x, y coordinates => 11 and 21
               // width, height => 81, 26
               // adding the 'User Name' label to the panel
               //Creating a text field where the user is supposed to
               //enter user name.
               JTextField usrText = new JTextField(21);
               // providing position and size of the text field
               // adding text field to the panel
               // Adding another label User Password
               JLabel pswdLabel = new JLabel("User Password");
               // providing position and size of the label User Password
               // by invoking the method setBounds
               // adding the 'User Password' label to the panel
               //Creating a password field where the user is supposed to
               //enter user password.
               JPasswordField pswdText = new JPasswordField(21);
               // providing position and size of the password field
               // adding password field to the panel
               // Creating a button 'User Login'
               JButton loginBtn = new JButton("User Login");
               // providing position and size to the 'User Login' button
               loginBtn.setBounds(11, 81, 79, 26);
               // adding the button to the panel


Swing Program In Java

Explanation: The UI created above has a lot of parts. One of the parts is JFrame.

JFrame: JFrame is the first part that comes into existence in a swing application. It contains the title, panels, various buttons, text fields, etc. JFrame is the most fundamental part of a swing UI application.

JFrame f = new JFrame("A basic login page");

The above statement creates a JFrame with the title “A basic login page”

The JFrame does not contain the buttons or fields directly. The frame needs a panel for it.

JPanel: The JPanel class is responsible for creating panels in a swing application. A frame can have more than one panel. A panel is responsible for the positioning or size of fields, buttons, etc. A panel in the swing is similar to a div tag in HTML. Both are used for the grouping of elements/ components.

JPanel p = new JPanel();

The above statement creates a new panel for the Java swing application. After the creation of the panel, we can add components like labels, text fields, buttons, etc.

JLabel: The text written in output (User Name, User Password) is due to the class JLabel. The main usage of the JLabel class is to put labels/ texts in the GUI.

JLabel usrLabel = new JLabel("User Name");

The above statement creates a label ‘User Name’. Similarly, other labels can also be created.

JTextField: Corresponding to the label ‘User Name’, it is required to allow the user to enter his/ her user name. To serve this purpose, the class JTextField is used. abc shown in the output is written by the user.

JTextField usrText = new JTextField(21);

The above statement creates an empty text field with the given column numbers, i.e., 21.

JPasswordField: The class JPasswordField is similar to JTextField. The only difference is that the class JPasswordField hides the input given by the user and shows only dots, which is normal behavior when the password is entered on any login page. The output also shows the same.

JPasswordField pswdText = new JPasswordField(21);

The above-written statement creates a new password field of column size 21.

JButton: A login button is required to validate the of inputs given by the user. For the creation of a login button, the class JButton is used. The following statement creates a button and puts the label “User Login” on it.

JButton loginBtn = new JButton("User Login");

Cross button (X): The cross button terminates the application when pressed (look at the top right corner of the output). It happens because of the following:


The statement has to be present to terminate the program. Because the default behavior of the cross button is to hide the application. Comment the above statement in the program, and observe the behavior.