When the width of a column is changed, all columns to the right are resized

 

import javax.swing.JTable;

public class Main {
  public static void main(String[] argv) throws Exception {
    Object[][] cellData = { { "1-1", "1-2" }, { "2-1", "2-2" } };
    String[] columnNames = { "col1", "col2" };

    JTable table = new JTable(cellData, columnNames);
    
    table.setAutoResizeMode(JTable.AUTO_RESIZE_SUBSEQUENT_COLUMNS);
  }
}

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When the width of a column is changed, all columns to the right are resized : Table Column « Swing JFC « Java

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