Get the index of the tab by matching the child component

 
    
import javax.swing.JButton;
import javax.swing.JTabbedPane;

public class Main {
  public static void main(String[] argv) throws Exception {
    JTabbedPane pane = new JTabbedPane();
    JButton component = new JButton("button");
    int index = pane.indexOfComponent(component);

    if (index < 0) {
      // The tab could not be found
    }
  }
}

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Get the index of the tab by matching the child component : TabbedPane « Swing JFC « Java

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