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Java中常见的布局有FlowLayout、BorderLayout、GridLayout、GridBagLayout和BoxLayout。
FlowLayout布局是按照组件添加的顺序依次排列,当组件的宽度超过容器的宽度时,会自动换行。示例代码如下:
JPanel panel = new JPanel(new FlowLayout());
panel.add(new JButton("Button 1"));
panel.add(new JButton("Button 2"));
panel.add(new JButton("Button 3"));
BorderLayout布局将容器分为五个区域:北、南、东、西和中。组件可以放置在这五个区域中的任意一个,如果没有指定区域,默认放置在中间。示例代码如下:
JPanel panel = new JPanel(new BorderLayout());
panel.add(new JButton("Button 1"), BorderLayout.NORTH);
panel.add(new JButton("Button 2"), BorderLayout.SOUTH);
panel.add(new JButton("Button 3"), BorderLayout.EAST);
panel.add(new JButton("Button 4"), BorderLayout.WEST);
panel.add(new JButton("Button 5"), BorderLayout.CENTER);
GridLayout布局将容器分为规则的网格,组件按照从左到右、从上到下的顺序排列。示例代码如下:
JPanel panel = new JPanel(new GridLayout(3, 3));
panel.add(new JButton("Button 1"));
panel.add(new JButton("Button 2"));
panel.add(new JButton("Button 3"));
panel.add(new JButton("Button 4"));
panel.add(new JButton("Button 5"));
panel.add(new JButton("Button 6"));
panel.add(new JButton("Button 7"));
panel.add(new JButton("Button 8"));
panel.add(new JButton("Button 9"));
GridBagLayout布局是一种灵活的布局方式,可以通过设置组件的约束条件来控制组件的位置和大小。示例代码如下:
JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints constraints = new GridBagConstraints();
constraints.gridx = 0;
constraints.gridy = 0;
panel.add(new JButton("Button 1"), constraints);
constraints.gridx = 1;
constraints.gridy = 0;
panel.add(new JButton("Button 2"), constraints);
constraints.gridx = 0;
constraints.gridy = 1;
panel.add(new JButton("Button 3"), constraints);
constraints.gridx = 1;
constraints.gridy = 1;
panel.add(new JButton("Button 4"), constraints);
BoxLayout布局可以将组件水平或垂直排列。示例代码如下:
JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
panel.add(new JButton("Button 1"));
panel.add(new JButton("Button 2"));
panel.add(new JButton("Button 3"));
以上就是Java中常见的布局方式,通过选择合适的布局方式,可以实现不同的界面布局效果。