Retrieve Data from user in java

Retrieve Data from user in java

getText and SetText Method

getText() :-
 This method is used to retrieve (or receive) the text of a component like Text Feild at run time

e.g :   name.getText();

setText:-
This method is used to change the  display text  of a component like label, text field or button  at run time

e.g   nn.setText(""+name);

Message Pop-Ups : JOptionPane Dialog 

 if you just want to show a JOptionPane dialog with a simple text message, all you need is one line of Java source code, like this:

JOptionPane.showMessageDialog(frame, "A basic JOptionPane message dialog"

examples

Starting with a simple example, if you just want to show a JOptionPane dialog with a simple text message, all you need is one line of Java source code, like this:

JOptionPane.showMessageDialog(frame, "A basic JOptionPane message dialog");

When this line of code is executed it will display the following message dialog:

In that example my first argument to the JOptionPane showMessageDialog method is a frame object, which presumably is an instance of a JFrame. If for some reason you don't have a reference to JFrame or JWindow instance, you can make that field null, and still display the identical JOptionPane dialog, as shown in this example:

JOptionPane.showMessageDialog(null, "A basic JOptionPane message dialog");

Note that when you supply a null argument like that, the JOptionPane dialog will be centered on the user’s screen. When you supply a JFramereference, the dialog is centered on that JFrame, so this behavior can be slightly different.

Note: don’t forget to  include import javax.swing.JOptionPane;

Parse Method in java

This method is used to get the primitive data type of a certain String. parseXxx() is a static method and can have one argument or two.

Example

public class StringToIntExample{  

public static void main(String args[]){  

String s="200";  

int i=Integer.parseInt(s);  

System.out.println(s+100);
//200100 because + is string concatenation operator  

System.out.println(i+100);
//300 because + is binary plus operator  

}}  

Output

200100

300