这是一个示例，它将使添加到用作容器的面板的所有JPanel保持左对齐。
JPanel a = new JPanel();
JPanel b = new JPanel();
JPanel c = new JPanel();
a.setBackground( Color.RED );
b.setBackground( Color.GREEN );
c.setBackground( Color.BLUE );
a.setMaximumSize( new Dimension( 10, 10) );
b.setMaximumSize( new Dimension( 50, 10) );
a.setAlignmentX( Component.LEFT_ALIGNMENT );//0.0
b.setAlignmentX( Component.LEFT_ALIGNMENT );//0.0
c.setAlignmentX( Component.LEFT_ALIGNMENT );//0.0
JPanel panel = new JPanel();
panel.setLayout(new @R_989_2419@Layout(panel, @R_989_2419@Layout.Y_AXIS));
panel.add(a);
panel.add(b);
panel.add(c);
int result = JOptionPane.showConfirmDialog(null, panel, "Please enter values.", JOptionPane.OK_CANCEL_OPTION);
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