doLayout()当您在水平滚动条不可见的情况下尝试增加列的大小时，默认逻辑似乎不起作用，因此我摆脱了默认逻辑，只接受了列的宽度，而没有尝试对其进行调整。
import javax.swing.*;import javax.swing.table.*;public class TestTable { private static Object[][] data = new Object[][] { { "a", "b", "c" }, { "d", "e", "f" } }; private static Object[] colNames = new Object[] { "1", "2", "3" }; public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { JTable table = new JTable(data, colNames) { @Override public boolean getScrollableTracksViewportWidth() { return getPreferredSize().width < getParent().getWidth(); } @Override public void doLayout() { TableColumn resizingColumn = null; if (tableHeader != null) resizingColumn = tableHeader.getResizingColumn(); // Viewport size changed. May need to increase columns widths if (resizingColumn == null) { setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS); super.doLayout(); } // Specific column resized. Reset preferred widths else { TableColumnModel tcm = getColumnModel(); for (int i = 0; i < tcm.getColumnCount(); i++) { TableColumn tc = tcm.getColumn(i); tc.setPreferredWidth( tc.getWidth() ); } // Columns don't fill the viewport, invoke default layout if (tcm.getTotalColumnWidth() < getParent().getWidth()) setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS); super.doLayout(); } setAutoResizeMode(JTable.AUTO_RESIZE_OFF); } }; table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); Jframe frame = new Jframe(); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.add(new JScrollPane(table)); frame.pack(); frame.setVisible(true); } }); }}编辑为使用AUTO_RESIZE_ALL_COLUMNS。
