Setting the Number of Visible Items in the Menu of a JComboBox Component

  

import javax.swing.JComboBox;

public class Main {
  public static void main(String[] argv) throws Exception {
    String[] items = new String[50];
    for (int i = 0; i < items.length; i++) {
      items[i] = "" + Math.random();
    }
    JComboBox cb = new JComboBox(items);

    // Retrieve the current max visible rows
    int maxVisibleRows = cb.getMaximumRowCount();

    // Change the current max visible rows
    maxVisibleRows = 20;
    cb.setMaximumRowCount(maxVisibleRows);

  }
}

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Setting the Number of Visible Items in the Menu of a JComboBox Component : ComboBox « Swing JFC « Java

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