multilevel java packages

how do i define multilevel packages in java

package foo;

one level package

package foo[开发者_运维问答.1oo[.2oo]];

doesn't work.

It doesn't work because package names must start with a letter. This works:

package foo.bar.baz;

N.B. package names aren't hierarchical or nested in the way that they might look. A package name is simply an identifier for a namespace. That means that package foo.bar.baz is not truly a subpackage of package foo.bar.

See also:

• The Java Tutorial: What is a package?
• The Java Tutorial: Creating and Using Packages
• http://en.wikipedia.org/wiki/Java_package