How to print diffrent color and diffrent size of text in JTextArea ?

Question

Hello All,
i want to make JFrame which have JTextArea and i append text in
JTextArea in diffrent size and diffrent color and also with diffrent
fonts.
any body give me any example or help me ?
i m thanksfull.
Arif.

Answer 1

You can't have multiple text attributes in a JTextArea.
JTextArea manages a "text/plain" content type document that can't hold information about attributes ( color, font, size, etc.) for different portions of text.
You need a component that can manage styled documents. The most basic component that can do this is JEditorPane. It can manage the following content types :
"text/rtf" ==> via StyledDocument
"text/html" ==> via HTMLDocument
I've written for you an example of how a "Hello World" string could be colorized in a JEditorPane with "Hello" in red and "World" in blue.
import javax.swing.JEditorPane;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledEditorKit;
import javax.swing.text.StyledDocument;
import javax.swing.text.MutableAttributeSet;
import javax.swing.text.SimpleAttributeSet;
import java.awt.Color;
public class ColorizeTextTest{
     public static void main(String args[]){
          //build gui
          JFrame frame = new JFrame();
          JEditorPane editorPane = new JEditorPane();
          frame.getContentPane().add(editorPane);
          frame.pack();
          frame.setVisible(true);
          //create StyledEditorKit
          StyledEditorKit editorKit = new StyledEditorKit();
          //set this editorKit as the editor manager [JTextComponent] <-> [EditorKit] <-> [Document]
          editorPane.setEditorKit(editorKit);
          StyledDocument doc = (StyledDocument) editorPane.getDocument();
          //insert string "Hello World"
          //this text is going to be added to the StyledDocument with positions 0 to 10
          editorPane.setText("Hello World");
          //create and attribute set
          MutableAttributeSet atr = new SimpleAttributeSet();
          //set foreground color attribute to RED
          StyleConstants.setForeground(atr,Color.RED);
          //apply attribute to the word "Hello"
          int offset = 0; //we want to start applying this attribute at position 0
          int length = 5; //"Hello" string has a length of 5
          boolean replace = false; //should we override any other attribute not specified in "atr" : anwser "NO"
          doc.setCharacterAttributes(offset,length,atr,replace);
          //set foreground color attribute to BLUE
          StyleConstants.setForeground(atr,Color.BLUE);
          //apply attribute to the word "World"
          offset = 5; //we include the whitespace
          length = 6;
          doc.setCharacterAttributes(offset,length,atr,replace);
}