Do you usually write a no-arg constructor for your Java classes? You don’t have to – unless you need to initialize something in that constructor. Behind the scenes, the Java compiler adds the no-arg constructor directly into the byte-code if none is provided. But when one or more overloaded constructors are provided for that class, the compiler doesn’t add the default no-arg constructor to the byte-code. This has been part of Java since the beginning. <\/p>\n
Fast forward to today. I was doing some work with Groovy. All of a sudden, i realized that i forgot to add a no-arg constructor inspite of adding multiple constructors to a class and the code was still working without errors. That is when I found out that the Groovy compiler adds the no-arg constructor to the byte-code regardless of other overloaded constructors. I just thought I should share this learning with the world and hence this blog!<\/p>\n
Does JRuby, Jython, Scala and other JVM languages do it too? Will have to check…<\/p>\n
Don’t get me started on why i should use overloaded constructors when Groovy provides dynamic constructors out of the box. The short answer is “API Requirement” from the client. <\/p>\n","protected":false},"excerpt":{"rendered":"
Do you usually write a no-arg constructor for your Java classes? You don’t have to – unless you need to initialize something in that constructor. Behind the scenes, the Java compiler adds the no-arg constructor directly into the byte-code if none is provided. But when one or more overloaded constructors are provided for that class, the compiler doesn’t add the default no-arg constructor to the byte-code. This has been part of Java since the beginning. Fast forward to today. I was doing some work with Groovy. All of a sudden, i realized that i forgot to add a no-arg constructor...
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