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Create An Object From A String
Java: How To
import java.lang.reflect.*;
Class [] classParm = null;
Object [] objectParm = null;
try
{
String name = "com.rgagnon.MyClass";
Class cl = Class.forName(name);
java.lang.reflect.Constructor co = cl.getConstructor(classParm);
return co.newInstance(objectParm);
}
catch (Exception e)
{
e.printStackTrace();
return null;
}
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Another example, but this time we are calling a method dynamically
public class Test
{
public static void main(String args[])
{
try
{
String name = "java.lang.String";
String methodName = "toLowerCase";
// get String Class
Class cl = Class.forName(name);
// get the constructor
java.lang.reflect.Constructor constructor =
cl.getConstructor
(
new Class[]
{
Class.forName("java.lang.String")
}
);
// create an instance
Object invoker = constructor.newInstance
(
new String[] {"REAL'S HOWTO"}
);
// the method has no argument
Class arguments[] = new Class[] { };
// get the method
java.lang.reflect.Method objMethod = cl.getMethod(methodName, arguments);
// covert "REAL'S HOWTO" to "real's howto"
Object result = objMethod.invoke(invoker, arguments);
System.out.println(result);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
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