e824. 获得和设置JSplitPane中的子组件

 // Create a left-right split pane
    JSplitPane hpane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftComponent, rightComponent);

    // Create a top-bottom split pane
    JSplitPane vpane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, topComponent, bottomComponent);

    // Get the children from the horizontal split pane
    leftComponent = hpane.getLeftComponent();
    rightComponent = hpane.getRightComponent();

    // Get the children from the vertical split pane
    topComponent = vpane.getTopComponent();
    bottomComponent = vpane.getBottomComponent();

    // Replace the children in the horizontal split pane
    hpane.setLeftComponent(comp1);
    hpane.setRightComponent(comp2);

    // Replace the children in the vertical split pane
    vpane.setTopComponent(comp3);
    vpane.setBottomComponent(comp4);

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