e800. 监听JSlider的数值变化

// Create horizontal slider
    JSlider slider = new JSlider();
 
    // Register a change listener
    slider.addChangeListener(new ChangeListener() {
        // This method is called whenever the slider's value is changed
        public void stateChanged(ChangeEvent evt) {
            JSlider slider = (JSlider)evt.getSource();
 
            if (!slider.getValueIsAdjusting()) {
                // Get new value
                int value = slider.getValue();
            }
        }
    });

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