用GridBagLayout可实现复杂可控的布局。

以一个输入框为例：

final JTextField username = new JTextField(); final JTextField password = new JTextField(); JPanel regist = new JPanel(); regist.setLayout(new GridBagLayout()); regist.add(new JLabel("username:"), new GridBagConstraints(0,0,1,1, 0.0,0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(2,2,2,2), 0,0)); <pre name="code" class="java"> </pre> regist.add(username, new GridBagConstraints(1,0,1,1, 0.0,0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(2,2,2,2), 200,0)); <pre name="code" class="java"><pre name="code" class="java"> regist.add(new JLabel("password"), new GridBagConstraints(0,1,1,1, 0.0,0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(2,2,2,2), 0,0));</pre></pre>

<pre name="code" class="java"><pre name="code" class="java"><pre name="code" class="java"> regist.add(password, new GridBagConstraints(1,1,1,1, 0.0,0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(2,2,2,2), 200,0));</pre></pre></pre>

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这里面用到了GridBagConstraints 来定义组件的位置排列信息。

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最终的效果如下：

后面输入框的长度可以修改值200 来改变。

具体GridBagConstraints 可参见GridBagConstraints

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