Setting the Tab Size of a JTextArea Component

  

import java.awt.Font;

import javax.swing.JTextArea;

public class Main {
  public static void main(String[] argv) {
    JTextArea textarea = new JTextArea();
    // Get the default tab size
    int tabSize = textarea.getTabSize(); // 8

    // Change the tab size
    tabSize = 4;
    textarea.setTabSize(tabSize);

    Font font = textarea.getFont();
    System.out.println(font);
  }
}

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Setting the Tab Size of a JTextArea Component : TextArea « Swing JFC « Java

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