A Textfield is a component used for displaying, inputting and editing a single line of plain text. We can create textfield by creating an instance of Textfield class. The TextComponent is a superclass of TextField that provides common set of methods used by Textfield.
Text Classes User Interface
|
Method |
Returns |
Notes |
|
getSelectedText() |
String |
The string returned is only the selected text |
|
getSelectionEnd() |
Int |
The index to the last character selected |
|
getSelectionStart() |
Int |
The index to the first character selected |
|
getText() |
String |
The entire contents of the text object |
|
isEditable() |
Boolean |
if true, the user can type in the text object |
|
select(int selStart, int selEnd) |
Void |
Use this to “pre-mark” text(as in search) |
|
selectAll() |
Void |
Mark the whole text object contents(as in a file dialog window) |
|
setEditable(boolean t) |
Void |
if true, the user can type in the object |
|
setText(String t) |
Void |
Replace the entire contents of the text object |
|
TextField() |
|
Columns are approximate, some windowing systems don’t seem “perfect” |
|
TextField(int cols) |
|
|
|
TextField(String text) |
|
|
|
TextField(String text, int cols ) |
|
|
|
echoCharIsSet() |
Boolean |
False if we’re echoing the keystrokes properly, true if we’re echoing a single character(like password echo) |
|
getColumns() |
Int |
How wide is the textfield? |
|
getEchoChar() |
Char |
What is the password echo character? |
|
minimumSize() |
Dimension |
Tell us(in pixels) what the minimum space required is |
|
minimumSize(int cols) |
Dimension |
Tell us(in pixels) what the minimum space required is |
|
preferredSize() |
Dimension |
|
|
preferredSize(int Cols) |
Dimension |
|
|
setEchoCharacter(char c) |
Void |
Set the character to echo on keystrokes(password echo) |
import java.awt.*;
class Textfieldframe extends Frame
{
Textfieldframe()
{
setLayout(new FlowLayout());
Label lblUserid = new Label("Userid");
TextField TxtUserid = new TextField(10);
Label lblpassword = new Label("password");
TextField Txtpassword = new TextField("Mr Thakur",13);
Txtpassword.setEchoChar('*');
add(lblUserid); add(TxtUserid);
add(lblpassword); add(Txtpassword);
}
}
class TextFieldsJavaExample
{
public static void main(String args[])
{
Textfieldframe frame = new Textfieldframe();
frame.setTitle("Text Fields in Java Example");
frame.setSize(220,150);
frame.setResizable(false);
frame.setVisible(true);
}
}
Dinesh Thakur holds an B.C.A, MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.
Related Articles
Basic Courses
Advance Courses
