Topic: "double cannot be dereferenced"

"double cannot be dereferenced"

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Posted By: Andrew_Clarke
Posted On: Tuesday, January 22, 2002 05:28 AM

I am attempting to use doubles as arguments to a method called from another class. However the compiler fails with the message "Java 33: double cannot be dereferenced"

What does this mean? How can I correct my code to do what I want?

Is there anywhere that defines these error messages, probable causes and possible solutions? I couldn't find anything in the documentation that comes with the JDK. Normally I can figure them out, but this one's got me stumped.

Thanks, APC

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Re: "double cannot be dereferenced"

Posted By: Christopher_Schultz
Posted On: Tuesday, January 22, 2002 10:35 AM

You'll get this weird error (I say weird because usually Java-type-people don't think about dereferencing stuff) if you put a dot after a primitive:


double d = 3.141592654288;

System.err.println(d.length());

This will give you a compiler error. If you want to use a Double object, then use the java.lang.Double class, which has methods and everything. My guess is that you are calling a method on a primitive that you thought was an object.

Check your code, and it'll probably jump right out at you.

Hope that helps,

-chris

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