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I have a use case, where I have stored the List of Java Data Types in DB, Like Byte, Character, Integer, Long, BigDecimal, BigInteger, Boolean.

So my use case is like If I read the value Long, I need to create the Long.class, if I read String, then String.class.

Class cls = Class.forName("java.lang.Long);, then I can use the cls for my own purpose.

I can achieve this, by having Enum of the above data types, as soon I read the value from the db, I pass the value to enum to get the class type. But I don't know whether it is efficient or not. Is there any method present in Java which gives like, for the given string,(without fully qualified name), it should return the class type.

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  • Can you share some code? Commented May 20, 2020 at 14:54

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Storing a reference to the Class object is efficient but using the Class object for reflection can be expensive. If you're just using the Class for reference then you're fine. 

enum Decodable { BIG_INTEGER(BigInteger.class), INTEGER(Integer.class) // etc private final Class<?> decodableClass; private Decodable(Class<?> decodableClass) { this.decodableClass = decodableClass; } }

You could also just maintain a Set of Class objects.

private static final Set<Class<?>> DECODABLE_CLASSES = ImmutableSet.of(Integer.class, BigInteger.class); //etc
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Yes, same way I thought of. Having Enum looks better. I do see few utilities in groovy provides like this but this returns ClassNode, not the class. import org.codehaus.groovy.ast.ClassHelper; ClassNode classNode = ClassHelper.make("String") I thought java might have some thing like this

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