e797. 显示JSlider的标记

The slider supports two levels of tick marks, major and minor. Typically, the minor tick-mark spacing is smaller than the major tick-mark spacing. Also, the minor tick-mark spacing is a multiple of the major tick-mark spacing. However, the slider does not enforce any of these constraints.

    // Create a horizontal slider that moves left-to-right
    JSlider slider = new JSlider();
    // Determine if currently showing ticks
    boolean b = slider.getPaintTicks(); // false
    
    // Show tick marks
    slider.setPaintTicks(true);
    
    // Set major tick marks every 25 units
    int tickSpacing = 25;
    slider.setMajorTickSpacing(tickSpacing);
    
    // Set minor tick marks every 5 units
    tickSpacing = 5;
    slider.setMinorTickSpacing(tickSpacing);

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