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.SC (Computer Science), 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.
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