strut, glue, rigid area in BoxLayout

盒子排版器(BoxLayout)有3種無互動,純佔面積用之視窗元件可用,
摘要如下,


1.strut (支架)
Component v = Box.createVerticalStrut(h); //新增隱形固定高度h像素之垂直支架
Component h = Box.createHorizontalStrut(w); //新增隱形固定寬度w像素之水平支架

2.glue (黏膠)
Component v = Box.createVerticalGlue(); //新增隱形垂直等間隔黏膠
Component h = Box.createHorizontalGlue(); //新增隱形水平等間隔黏膠
Component g = Box.createGlue(); //新增隱形等間隔黏膠,適用於垂直或水平盒子排版器

3.rigid area (硬塊), 相當於2維支架
Dimension d = new Dimension(h,w);  // 新增寬h,高w尺寸
Component ra = Box.createRigidArea(d); // 依給定尺寸新增隱形硬塊

PS:
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