Rei*_*ard 5 java swing layout-manager border-layout
是否有可能使BorderLayout的东侧(或西侧)遍布整个面板(包括北/南)?

只需从此面板中删除West和East,然后创建一个新的"父"面板:
JPanel newPanel = new JPanel();
newPanel.setLayout(new BorderLayout());
newPanel.add(westernPanel, BorderLayout.WEST);
newPanel.add(yourOldPanel, BorderLayout.CENTER);
newPanel.add(eastenPanel, BorderLayout.EAST);
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