Other Java programmers do the same thing. In fact, everyone who writes Java code uses the javadoc program to generate documentation. So everyone’s Java documentation looks like everyone else’s Java documentation. When you know how read to the standard API documentation, you know how to read anybody’s homegrown Java docs. This class is designed for use as a drop-in replacement for StringBuffer in places where the string buffer was being used by a single thread (as is generally the case) Instances of StringBuilder are not safe for use by multiple threads. see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions. Java SE APIs. This page lists the documentation for the Java Platform, Standard Edition, and the JDK. The more general documentation page provides links to the documentation for Java EE, Java ME, and other Java APIs and products. (Note the Documentation Redistribution Policy.).