Java: int.class vs Class.getPrimitiveClass("int");

Question

Is there a difference between int.class and (Class<Integer>) Class.getPrimitiveClass("int"); in Java?

Standard Class doesn't have public getPrimitiveClass method. Consider adding library you are using. — Pshemo
– Pshemo, Commented Aug 26, 2014 at 20:50
I see it declared in Class.java as a native method. static native Class getPrimitiveClass(String name); — Pratik Khadloya
– Pratik Khadloya, Commented Aug 26, 2014 at 22:50
Complementing @PratikKhadloya comment, to use Class.getPrimitiveClass method your class MUST be in the java.lang package. Not necessarily the JVM java/lang, it could be inside your project. — Lourenco
– Lourenco, Commented Aug 19, 2017 at 2:25

Elliott Frisch · Accepted Answer · 2014-08-26 20:52:07Z

1

Well, first Class doesn't have a getPrimitiveClass(String) method. Second, I found this link which implements a method with that name, from the link

public static final Class<?> getPrimitiveClass(String typeName) {
    if (typeName.equals("byte"))
        return byte.class;
    if (typeName.equals("short"))
        return short.class;
    if (typeName.equals("int"))
        return int.class;
    if (typeName.equals("long"))
        return long.class;
    if (typeName.equals("char"))
        return char.class;
    if (typeName.equals("float"))
        return float.class;
    if (typeName.equals("double"))
        return double.class;
    if (typeName.equals("boolean"))
        return boolean.class;
    if (typeName.equals("void"))
        return void.class;
    throw new IllegalArgumentException("Not primitive type : " + typeName);
}

So, if you're using the method above - the answer is no. They're the same.

answered Aug 26, 2014 at 20:52

Elliott Frisch

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3 Comments

Pratik Khadloya Over a year ago

I see it declared in Class.java as a native method. static native Class getPrimitiveClass(String name);

Elliott Frisch Over a year ago

Not public and not in the javadoc. You could maybe use reflection to call it. But it might well blow up in a different version of java.

Lourenco Over a year ago

getPrimitiveClass is declared in java.lang.Class as a native method which visibility is default.

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