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                場景: 在利用 JAVA 的 Swing 開發 C/S 架構 的前端界面 目的: 想讓 JFrame 居中顯示在整個 屏幕的正中位置 方法一: ~~~ JFrame frame = new JFrame("TEST"); frame.setSize(200,100) Toolkit toolkit = Toolkit.getDefaultToolkit(); int x = (int)(toolkit.getScreenSize().getWidth()-f.getWidth())/2; int y = (int)(toolkit.getScreenSize().getHeight()-f.getHeight())/2; frame.setLocation(x, y); frame.setVisible(true); ~~~ 方法二: ~~~ JFrame frame = new JFrame("TEST"); frame.setLocationRelativeTo(null); ~~~ //傳入參數null 即可讓JFrame 位于屏幕中央, 這個函數若傳入一個Component ,則JFrame位于該組件的中央
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