Disable auto resizing, Set the first visible column to 100 pixels wide

 

import javax.swing.JTable;
import javax.swing.table.TableColumn;

public class Main {
  public static void main(String[] argv) {
    int rows = 3;
    int cols = 3;
    JTable table = new JTable(rows, cols);

    // 
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);    
    TableColumn col = table.getColumnModel().getColumn(0);
    int width = 100;
    col.setPreferredWidth(width);
  }
}

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Disable auto resizing, Set the first visible column to 100 pixels wide : Table Column « Swing JFC « Java

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