This exhaustive example illustrates JTextField in swing. This tutorial covers all core methods of javax.swing.JTextField class.
import javax.swing.*;
import java.awt.*;
import java.io.*;
class JTextFieldDemo extends JFrame
{
JTextField t1,t2,t3,t4;
public JTextFieldDemo()
{
createAndShowGUI();
}
private void createAndShowGUI()
{
setTitle("JTextField Example");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new FlowLayout());
// Empty one
t1=new JTextField();
// No.of cols
t2=new JTextField(20);
// Initial text
t3=new JTextField("Third textfield");
// Text and no.of cols
t4=new JTextField("Fourth textfield",25);
// Set text
t1.setText("First field");
t2.setText("Second field");
// Get text
System.out.println("Text in t1 "+t1.getText());
// Set cols
t1.setColumns(22);
// Get columns
System.out.println("Cols in t1 is "+t1.getColumns());
// Set horizontal alignment
// default is LEFT
t1.setHorizontalAlignment(JTextField.CENTER);
t2.setHorizontalAlignment(JTextField.RIGHT);
// Set font
t3.setFont(new Font("Tahoma",Font.PLAIN,18));
// Set caret color
t4.setCaretColor(Color.RED);
// Select some text
t1.select(0,5);
t2.select(0,6);
// Alternative ways for selecting
// t1.setCaretPosition(0);
// t1.moveCaretPosition(6);
// t1.setSelectionStart(0);
// t1.setSelectionEnd(4);
// Get selected text
System.out.println("Selected text in t1 "+t1.getSelectedText());
// Set selection background color
t1.setSelectionColor(Color.DARK_GRAY);
// Set selected text color
t1.setSelectedTextColor(Color.WHITE);
// Set inner margin
t4.setMargin(new Insets(5,5,5,5));
// Replace selected text
t2.replaceSelection("Two");
// Write text in t1 to file
try{
t1.write(new FileWriter("t1.txt"));
}catch(IOException e){}
// Read from file and put in t4
try{
t4.read(new FileReader("t1.txt"),null);
}catch(IOException e){}
// Make t3 non editable
t3.setEditable(false);
// Disable t4
t4.setEnabled(false);
// Set disabled foreground
t4.setDisabledTextColor(Color.BLUE);
// Set focus accelerator
// Alt+1 gives focus to t1
t1.setFocusAccelerator('1');
t2.setFocusAccelerator('2');
// Copy selected text in t1 to clipboard
t1.copy();
// For cutting,
// t2.cut();
// Pasting..
// t2.paste();
// Add all
add(t1);
add(t2);
add(t3);
add(t4);
setSize(400,400);
setVisible(true);
}
public static void main(String args[])
{
new JTextFieldDemo();
}
}
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