Usually package name corresponds to folder name, for example java\swing. One or several packages are packed into a JAR file.> 如果是我又怎么知道哪个方法具体在哪个包中呢?JDK's javadoc has detailed index of all the packages, classes, and indices. You may search by alphbatical order.
中,用winrar浏览就能看到层次结构.