question: public int writeClassData ( ClassData classData ) { int off = data . position ( ) ; writeUleb128 ( classData . staticFields . length ) ; writeUleb128 ( classData . instanceFields . length ) ; writeUleb128 ( classData . directMethods . length ) ; writeUleb128 ( classData . virtualMethods . length ) ; writeFields ( classData . staticFields ) ; writeFields ( classData . instanceFields ) ; writeMethods ( classData . directMethods ) ; writeMethods ( classData . virtualMethods ) ; return off ; }
target:  Write ClassData item into current section.