问在Java中以编程方式粘贴后恢复剪贴板

EN

public class ClipboardTestClass {
    static Robot robot;

    public static void main(String[] args) {

        try {
            robot = new Robot();
        } catch (AWTException ex) {
            Logger.getLogger(TestApp.class.getName()).log(Level.SEVERE, null, ex);
        }
        try {
            Thread.sleep(2000);
        } catch (InterruptedException ex) {
            Logger.getLogger(TestApp.class.getName()).log(Level.SEVERE, null, ex);
        }
        for(int i = 0; i< 10; i++){
            enterString("Hello\n");
        }
    }

    public static void enterString(String myString){

        System.out.println("Trying to paste string \"" + myString + "\"");
        StringSelection stringSelection = new StringSelection(myString);
        //save clipboard content
        Transferable clipboardContent = Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null);
        //enter new clipboard content
        Toolkit.getDefaultToolkit().getSystemClipboard().setContents((Transferable) stringSelection, null);

        //paste clipboard content with Robot class
        robot.keyPress(VK_CONTROL);
        robot.keyPress(VK_V);
        robot.keyRelease(VK_CONTROL);
        robot.keyRelease(VK_V);

        //restore clipboard content
        Toolkit.getDefaultToolkit().getSystemClipboard().setContents(clipboardContent, null);
    }
}