object 源代码

'A string'.respond_to? :to_str # => true Exception.new.respond_to? :to_str # => true 4.respond_to? :to_str …

class Object def must_have_instance_variables(*args) vars = instance_variables.inject({}) { |h,var| h[var] = true; h } a…

This example creates a new Point object from the constructor Point(int,int). try { java.awt.Point obj = (java.awt.P…

boolean b = object.getClass().isArray(); if (b) { // object is an array }

This example registers with the directory to receive notification when changes are made to objects that have certain attributes. …

A phantom reference is used to determine when an object is just about to be reclaimed. Phantom references are safer to use than fi…