Java JTextArea Example

Java JTextArea Example

JTextArea is a swing component that displays multiple lines text.JTextField is same as JTextArea only that it displays single line text.

How to Declare JTextArea class

[public class JTextArea extends JTextComponent]

JTextArea used constructors.

• JTextArea()-create a empty JTextArea with no text.
• JTextArea(String s)-creates a JTextArea with a text inside it.
• JTextArea(int row,int col)-creates a JTextArea with specified number of rows and columns.
• JTextArea(String s,int row,int col)-creates a JTextArea with a initial text and specified number of columns and rows.

JTextArea common methods.

• void setRows(int rows)-used to set number of rows in a JTextArea.
• void setColumns(int col)-used to set number of columns.
• void setFont(Font f)-used to set Font size.
• void  insert(String s,int position)-inserts a text in a specified position.
• void append(String s)-used to append text at the end.

Java JTextArea Example

[

import javax.swing.JTextArea;
import javax.swing.JFrame;

public class TextArea extends JFrame{
    public TextArea()
    {
        super("JTextArea Example");
        JTextArea area=new JTextArea();
        area.setBounds(30, 30, 200, 200);
        add(area);
        setSize(300,300);
        setLayout(null);
        setVisible(true);


    }
    public static void main(String args[])
    {
        new TextArea();
    }
}

]

Java JTextArea Example with ActionListener

[

import javax.swing.JButton;
import javax.swing.JTextArea;
import javax.swing.JLabel;
import javax.swing.JFrame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class JTextAreaExample  implements ActionListener{

    JLabel label1,label2;
    JButton button;
    JTextArea area;
    public JTextAreaExample()
    {
        JFrame frame=new JFrame("JTextArea Example");
        label1=new JLabel();
        label1.setBounds(50,25,100,30);


        label2=new JLabel();
        label2.setBounds(160,25,100,30);
        area=new JTextArea();
        area.setBounds(20,75,250,200);
        button=new JButton("Count Words");
        button.setBounds(100,300,120,30);
        button.addActionListener(this);
        frame.add(label1);
        frame.add(label2);
        frame.add(area);
        frame.add(button);
        frame.setSize(450,450);
        frame.setLayout(null);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);

    }
    public void actionPerformed(ActionEvent event)
    {
        String text=area.getText();
        String words[]=text.split("\\s");
        label1.setText("Words: "+words.length);
        label2.setText("Characters: "+text.length());
    }
    public static void main(String args[])
    {
        new JTextAreaExample();
    }
}

]

Output

See also:

• Java JButton

• Java JTextField

• JOptionPane