Skip to main content

Java AWT Button, Label

Java AWT Button

The button class is used to create a labeled button that has platform independent implementation. The application result in some action when the button is pushed.

AWT Button Class declaration

  1. public class Button extends Component implements Accessible  

Java AWT Button Example

  1. import java.awt.*;  
  2. public class ButtonExample {  
  3. public static void main(String[] args) {  
  4.     Frame f=new Frame("Button Example");  
  5.     Button b=new Button("Click Here");  
  6.     b.setBounds(50,100,80,30);  
  7.     f.add(b);  
  8.     f.setSize(400,400);  
  9.     f.setLayout(null);  
  10.     f.setVisible(true);   
  11. }  
  12. }  


Java AWT Button Example with ActionListener

  1. import java.awt.*;  
  2. import java.awt.event.*;  
  3. public class ButtonExample {  
  4. public static void main(String[] args) {  
  5.     Frame f=new Frame("Button Example");  
  6.     final TextField tf=new TextField();  
  7.     tf.setBounds(50,50, 150,20);  
  8.     Button b=new Button("Click Here");  
  9.     b.setBounds(50,100,60,30);  
  10.     b.addActionListener(new ActionListener(){  
  11.     public void actionPerformed(ActionEvent e){  
  12.             tf.setText("Welcome to Javatpoint.");  
  13.         }  
  14.     });  
  15.     f.add(b);f.add(tf);  
  16.     f.setSize(400,400);  
  17.     f.setLayout(null);  
  18.     f.setVisible(true);   
  19. }  
  20. }  


ava AWT Label

The object of Label class is a component for placing text in a container. It is used to display a single line of read only text. The text can be changed by an application but a user cannot edit it directly.

AWT Label Class Declaration

  1. public class Label extends Component implements Accessible  

Java Label Example

  1. import java.awt.*;  
  2. class LabelExample{  
  3. public static void main(String args[]){  
  4.     Frame f= new Frame("Label Example");  
  5.     Label l1,l2;  
  6.     l1=new Label("First Label.");  
  7.     l1.setBounds(50,100, 100,30);  
  8.     l2=new Label("Second Label.");  
  9.     l2.setBounds(50,150, 100,30);  
  10.     f.add(l1); f.add(l2);  
  11.     f.setSize(400,400);  
  12.     f.setLayout(null);  
  13.     f.setVisible(true);  
  14. }  
  15. }  

Java AWT Label Example with ActionListener

  1. import java.awt.*;  
  2. import java.awt.event.*;  
  3. public class LabelExample extends Frame implements ActionListener{  
  4.     TextField tf; Label l; Button b;  
  5.     LabelExample(){  
  6.         tf=new TextField();  
  7.         tf.setBounds(50,50, 150,20);  
  8.         l=new Label();  
  9.         l.setBounds(50,100, 250,20);      
  10.         b=new Button("Find IP");  
  11.         b.setBounds(50,150,60,30);  
  12.         b.addActionListener(this);    
  13.         add(b);add(tf);add(l);    
  14.         setSize(400,400);  
  15.         setLayout(null);  
  16.         setVisible(true);  
  17.     }  
  18.     public void actionPerformed(ActionEvent e) {  
  19.         try{  
  20.         String host=tf.getText();  
  21.         String ip=java.net.InetAddress.getByName(host).getHostAddress();  
  22.         l.setText("IP of "+host+" is: "+ip);  
  23.         }catch(Exception ex){System.out.println(ex);}  
  24.     }  
  25.     public static void main(String[] args) {  
  26.         new LabelExample();  
  27.     }  
  28. }  
Anurag Rana

Comments

Post a Comment

Popular posts from this blog

Standard and Formatted Input / Output in C++

The C++ standard libraries provide an extensive set of input/output capabilities which we will see in subsequent chapters. This chapter will discuss very basic and most common I/O operations required for C++ programming. C++ I/O occurs in streams, which are sequences of bytes. If bytes flow from a device like a keyboard, a disk drive, or a network connection etc. to main memory, this is called   input operation   and if bytes flow from main memory to a device like a display screen, a printer, a disk drive, or a network connection, etc., this is called   output operation . Standard Input and Output in C++ is done through the use of  streams . Streams are generic places to send or receive data. In C++, I/O is done through classes and objects defined in the header file  <iostream> .  iostream  stands for standard input-output stream. This header file contains definitions to objects like  cin ,  cout , etc. /O Library Header Files There are...
Post a Comment
Read more

Data Warehousing - An Overview

Anurag Information Technology (IT) has historically influenced organizational performance and competitive standing. The increasing processing power and sophistication of analytical tools and techniques have put the strong foundation for the product called data warehouse. There are a number of reasons that any organization should consider a data warehouse, which can be the critical tool for maximizing the organization’s investment in the information it has collected and stored throughout the enterprise. IT managers need to understand the rationale and benefits of data warehouses because they may need to design and implement, or procure this kingpin of business intelligence. The data warehouses are supposed to provide storage, functionality and responsiveness to queries beyond the capabilities of today's transaction-oriented databases. Also data warehouses are set to improve the data access performance of databases. Traditional databases balance the requirement of data access w...
Post a Comment
Read more

Genotype Representation

Binary Representation This is one of the simplest and most widely used representation in GAs. In this type of representation the genotype consists of bit strings. For some problems when the solution space consists of Boolean decision variables – yes or no, the binary representation is natural. Take for example the 0/1 Knapsack Problem. If there are n items, we can represent a solution by a binary string of n elements, where the x th  element tells whether the item x is picked (1) or not (0). For other problems, specifically those dealing with numbers, we can represent the numbers with their binary representation. The problem with this kind of encoding is that different bits have different significance and therefore mutation and crossover operators can have undesired consequences. This can be resolved to some extent by using  Gray Coding,  as a change in one bit does not have a massive effect on the solution. Real Valued Representation For problems where we want to define ...
Post a Comment
Read more