如何知道JScrollBar是否已到达JScrollPane的底部？

您必须将滚动条的范围添加到您的计算中。我在下面的示例中将代码添加到您的代码中。

scrollPane.getVerticalScrollBar().addAdjustmentListener(new AdjustmentListener() {    @Override    public void adjustmentValueChanged(AdjustmentEvent ae) {        int extent = scrollPane.getVerticalScrollBar().getModel().getExtent();        System.out.println("Value: " + (scrollPane.getVerticalScrollBar().getValue()+extent) + " Max: " + scrollPane.getVerticalScrollBar().getMaximum());    }});

两种替代实现（部分对Kleopatra做出反应）

scrollPane.getVerticalScrollBar().addAdjustmentListener(new AdjustmentListener() {    @Override    public void adjustmentValueChanged(AdjustmentEvent event) {        JScrollBar scrollBar = (JScrollBar) event.getAdjustable();        int extent = scrollBar.getModel().getExtent();        System.out.println("1. Value: " + (scrollBar.getValue() + extent) + " Max: " + scrollBar.getMaximum());    }});

或通过模型

scrollPane.getVerticalScrollBar().getModel().addChangeListener(new ChangeListener() {    @Override    public void stateChanged(ChangeEvent event) {        BoundedRangeModel model = (BoundedRangeModel) event.getSource();        int extent = model.getExtent();        int maximum = model.getMaximum();        int value = model.getValue();        System.out.println("2. Value: " + (value + extent) + " Max: " + maximum);    }});