'public MyDBAdapter open()' What does 'open()' means after MyDBAdapter?

What does 'open()' means after MyDBAdapter? MyDBAdapter is class name.

public MyDBAdapter open() throws SQLException {
    db = dbHelp开发者_如何学运维er.getWritableDatabase();
    return this;
}

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open is the method name. The fragment you pasted defines a public method called open which takes no arguments (there's nothing listed between the parentheses) which returns an instance of MyDBAdapter and may throw a SQLException.

You may want to have a look at the tutorial on method declaration: http://download.oracle.com/javase/tutorial/java/javaOO/methods.html