How to Achieve Custom Text Coloring in Java Swing Beyond JTextArea?

Custom Text Coloring in JTextArea Alternatives

In JTextArea, applying text formatting affects the entire document rather than specific characters or sections. To achieve customized text coloring, consider utilizing alternative components like JTextPane or JEditorPane.

Custom Text Coloring Using JTextPane

JTextPane allows you to set different colors for specific sections of text:

import java.awt.Color;
import java.awt.Insets;
import java.awt.event.EmptyBorder;
import javax.swing.JTextPane;
import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;

public class TextColoringDemo {

    public void setTextColors() {
        JTextPane textPane = new JTextPane();
        textPane.setBorder(new EmptyBorder(new Insets(10, 10, 10, 10)));

        StyleContext styleContext = StyleContext.getDefaultStyleContext();
        AttributeSet blueAttributeSet = styleContext.addAttribute(
                SimpleAttributeSet.EMPTY,
                StyleConstants.Foreground,
                Color.BLUE
        );

        AttributeSet greenAttributeSet = styleContext.addAttribute(
                SimpleAttributeSet.EMPTY,
                StyleConstants.Foreground,
                Color.GREEN
        );

        AttributeSet redAttributeSet = styleContext.addAttribute(
                SimpleAttributeSet.EMPTY,
                StyleConstants.Foreground,
                Color.RED
        );

        AttributeSet orangeAttributeSet = styleContext.addAttribute(
                SimpleAttributeSet.EMPTY,
                StyleConstants.Foreground,
                Color.ORANGE
        );

        // Set the color of specific text sections
        textPane.setCharacterAttributes(blueAttributeSet, true);
        textPane.replaceSelection("LOAD R1, 1\n");
        textPane.setCharacterAttributes(blueAttributeSet, true);
        textPane.replaceSelection("DEC R1\n");
        textPane.setCharacterAttributes(blueAttributeSet, true);
        textPane.replaceSelection("STORE M, R1\n");
        textPane.setCharacterAttributes(blueAttributeSet, true);
        textPane.replaceSelection("ADD R4, R1,8\n");

        textPane.setCharacterAttributes(greenAttributeSet, true);
        textPane.replaceSelection("R1\n");
        textPane.setCharacterAttributes(greenAttributeSet, true);
        textPane.replaceSelection("R4\n");

        textPane.setCharacterAttributes(redAttributeSet, true);
        textPane.replaceSelection("M\n");

        textPane.setCharacterAttributes(orangeAttributeSet, true);
        textPane.replaceSelection("1\n");
        textPane.setCharacterAttributes(orangeAttributeSet, true);
        textPane.replaceSelection("8\n");
    }
}

This approach allows you to customize the color of any specified text section within the JTextPane component.

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