Program to create a Popup Menu using Java AWT

This tutorial shows you how to create a simple popup menu in Java. Popup menu is a menu which appears when you right click on mouse. For example, to copy, paste something in computer you right click and it will show the popup menu like:



Here you have to create a popup menu with basic three options Green, Cyan and Magenta. After selecting particular option it will change the background color of window. The output of the same is given below.

BEFORE selecting option from popup menu :

















 AFTER selecting option Magenta output will be:
















PROGRAM
import java.awt.*;
import java.awt.event.*;

class PopupMenuDemo extends Frame implements ActionListener {

 PopupMenu popupMenu;
 MenuItem mGreen, mCyan, mMagenta;
 
 public PopupMenuDemo() {
  
  // Creating PopupMenu
  popupMenu = new PopupMenu();
  
  // Creating popup menu items
  mGreen = new MenuItem("Green");
  mCyan = new MenuItem("Cyan");
  mMagenta = new MenuItem("Magenta");
  
  // Adding action listeners to menu items
  mGreen.addActionListener(this);
  mCyan.addActionListener(this);
  mMagenta.addActionListener(this);
  
  // Adding menu items to popup menu
  popupMenu.add(mGreen);
  popupMenu.add(mCyan);
  popupMenu.add(mMagenta);
  
  add(popupMenu); // Add popup menu to Frame window
  
  // Handling mouse event
  addMouseListener(new MouseAdapter() {
   
   public void mousePressed(MouseEvent me) { // Checking for Mouse right click
    if(me.getButton() == MouseEvent.BUTTON3) {
     popupMenu.show(PopupMenuDemo.this, me.getX(), me.getY());
    }
   }
  });
  
  // Handling window event
  addWindowListener(new WindowAdapter() {
   
   public void windowClosing(WindowEvent we) {
    dispose();
   }
  });
 }
 
 public void actionPerformed(ActionEvent ae) {
  
  if(ae.getSource() == mGreen) 
   setBackground(Color.GREEN);
  else if(ae.getSource() == mCyan)
   setBackground(Color.CYAN);
  else
   setBackground(Color.MAGENTA);
 }
 
 public static void main(String args[]) {
  
  PopupMenuDemo p = new PopupMenuDemo();
  p.setTitle("Program for popup menu");
  p.setSize(400, 400);
  p.setVisible(true);
 }
}


Popular posts from this blog

Program to define a class 'employee' with data members as empid, name and salary. Accept data for 5 objects using Array of objects and print it.

This program demonstrates you the array of objects.  Array of object  is the collection of objects of the same class. The given syntax will define an array of reference therefore assign object to individual reference in the array to declare the array of object. The syntax to define array of object is: <class-name> <array-name> [size]; For example, the following statement will define an array of object having size 6 references to the class  Box . Box b[6]; For creating an array of objects (allocating memory) you have to write down the following statements for (int i=0; i<6; i++) { b[i] = new Box(); // Assigning object to individual reference in the array. } PROGRAM import java.util.Scanner; public class Employee { int empid; String name; float salary; public void getInput() { Scanner in = new Scanner(System.in); System.out.print("Enter the empid :: "); empid = in.nextInt(); System.out.print("Enter the name :: ");
Read more

Define a class Student with four data members such as name, roll no.,sub1, and sub2. Define appropriate methods to initialize and display the values of data members. Also calculate total marks and percentage scored by student.

In this program, first we first create a class  Student  which have data members  name, roll_no, sub1, sub2  and one method to read data here  getdata( )  method and show the result here  show( )  method. We have used  java.io.BufferedReader  class to read data from keyboard at runtime. Then we have created an object of Student class in  StudentDemo  class and called the methods of Student class. When you compile the code using  javac StudentDemo.java  command two .class files will be created which are  Student.class  and  StudentDemo.class , this has the advantage that you can reuse your .class file somewhere in other projects without compiling the code again. You can create as many classes as you want but writing many classes in a single file is not recommended as it makes code difficult to read rather you can create single file for every class. You can also group classes in packages for easily managing your code. PROGRAM import java.lang.*; import java.io.*; class Student {
Read more

Program to input age from user and throw user-defined exception if entered age is negative

An  Exception  is an abnormal condition that arises in a code sequence at run time. Exceptions are run time errors. Exceptions generated by the Java are related to the fundamental errors that violate the Java language constraints. All exception classes are subtypes of the  java.lang.Exception  class. The exception class is a subclass of the  Throwable  class. Java defines several exception classes inside the standard package  java.lang . Some examples of exceptions are  ArithmeticException, ArrayIndexOutOfBoundsException, IndexOutOfBoundsException, NullPointerException, NumberFormatException, ClassNotFoundException,etc. When Java Interpreter caught an error such as divide by zero, the interpreter creates an exception object and throws it to inform that an error has occurred. Java has its own exception handling mechanism. It performs the following task: Find the problem –  Hit  the exception Inform that an error has occurred –  Throw  the exception Receives the error infor
Read more