Applet Applets are small Java applications that can be accessed on an Internet server, transported over Internet, and can be automatically installed and run as apart of a web document. After a user receives an applet, the applet can produce a graphical user interface. It has limited access to resources so that it can run […]
Continue ReadingEvent Handling Any program that uses GUI (graphical user interface) such as Java application written for windows, is event driven. Event describes the change in state of any object. For Example : Pressing a button, Entering a character in Textbox, Clicking or Dragging a mouse, etc. Components of Event Handling Event handling has three main components, Events […]
Continue Reading6.2 JTextField JTextField is used for taking input of single line of text. It is most widely used text component. It has three constructors,
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JTextField(int cols) JTextField(String str, int cols) JTextField(String str) |
xample using JTextField
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import javax.swing.*; import java.awt.event.*; import java.awt.*; public class MyTextField extends JFrame { public MyTextField() { JTextField jtf = new JTextField(20); //creating JTextField. add(jtf); //adding JTextField to frame. setLayout(new FlowLayout()); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(400, 400); setVisible(true); } public static void main(String[] args) { new MyTextField(); } } |
6.3 JButton JButton class provides functionality of a button. JButton class has three constuctors,
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JButton(Icon ic) JButton(String str) JButton(String str, Icon ic) |
It allows a button to be created using icon, a string or […]
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Continue ReadingCongestion Congestion in a network may occur if the load on the network-the number of packets sent to the network-is greater than the capacity of the network-the number of packets a network can handle. Congestion happens in any system that involves waiting. 6.1.1 General Principles of congestion control Congestion control refers to techniques and mechanisms […]
Continue Reading3.1 AWT classes AWT contains large number of classes and methods that allows you to create and manage graphical user interface ( GUI ) applications, such as windows, buttons, scroll bars,etc. 2 packages – java.awt and java.awt.event – are commonly-used. The java.awt package contains the core AWT graphics classes: GUI Component classes, such as Button, TextField, and Label. GUI Container classes, such as Frame and Panel. Layout managers, such as FlowLayout, BorderLayout and GridLayout. […]
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