How to add "certificate policy" into a certificate?

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Java

certificate

I wanna generate a certificate with the _certificate policy_ exntension. The _certificate policy_ extension has two components: _policy identifier_ and _userNotice qualifier_ (_noticeRef_ and _explicitText_). Now the problem is how to the _userNotice qualifier_ using _sun.security_ of Java.

What I have tried:

I tried the following code:

PolicyQualifierInfo policyQualifierInfo1=new PolicyQualifierInfo(byte[] encoded);

But I do not know the meaning of _byte[] encoded_. Can someone give me a code example to explain how to generate _policy identifier_?