E:\>javac HelloWorld.java
HelloWorld.java:3: 错误: 非法字符: '\uff08'
        System.out.println（"welcome to imooc!"）;
                          ^
HelloWorld.java:3: 错误: 不是语句
        System.out.println（"welcome to imooc!"）;
                  ^
HelloWorld.java:3: 错误: 非法字符: '\uff09'
        System.out.println（"welcome to imooc!"）;