你真的了解try-catch-finally么？

try-catch-finally看似是很简单的执行流程，但是如果加上return，结果你能争取判断么？考虑以下代码：

public class ExceptionTest {
    public static void main(String[] args) {
        String s = null;

        try {
            s = genString(true);
        } finally {
            System.out.println(s);
        }
    }

    private static String genString(boolean throwEx) {
        try {
            if (throwEx) {
                throw new RuntimeException("Exception");
            }

            System.out.println("in try");
            return "no exception";
        } catch (Exception ex) {
            System.out.println("in catch");
            return "exception";
        } finally {
            System.out.println("in finally");
            return "finally";
        }
    }
}

其中genString(boolean)可以决定是否抛异常，在“true”时会打印什么？或者说，genString方法究竟会执行哪条return？传入“false”呢？