以前以为Slider和Scale之间只是外观的区别，今天发现不是这样的，因为Slider有一个特点：getSelection()能得到的最 大值并不是getMaximum()的值，要减去getThumb()值，后者是中间的滑块所拥有的值，缺省为10，最小为1。运行这个程序观察控制台的 输出。

import org.eclipse.swt.*;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.*;

public class SliderTest {

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);

        //Slider
        final Slider slider = new Slider(shell, SWT.HORIZONTAL);
        slider.setBounds(10, 10, 200, 32);
        slider.setMinimum(0);
        slider.setMaximum(100);
        slider.setThumb(5);
        slider.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                System.out.println("Slider Selection:" + slider.getSelection());
            }
        });

        //Scale
        final Scale scale = new Scale(shell, SWT.HORIZONTAL);
        scale.setBounds(10, 50, 200, 72);
        scale.setMinimum(0);
        scale.setMaximum(100);
        scale.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                System.out.println("Scale Selection:" + scale.getSelection());
            }
        });

        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}

搬家前链接：https://www.cnblogs.com/bjzhanghao/archive/2005/10/26/262517.html