Java Class .getDeclaredConstructor (Class <?> . . . parameterTypes)
Syntax
Class.getDeclaredConstructor(Class <?>... parameterTypes) has the following syntax.
public Constructor <T>
getDeclaredConstructor(Class <?>... parameterTypes)
throws NoSuchMethodException,
SecurityException
Example
In the following code shows how to use Class.getDeclaredConstructor(Class <?>... parameterTypes) method.
/*from ww w . j a va2 s . co m*/
import java.lang.reflect.Constructor;
public class Main {
public static void main(String[] args) throws Exception {
MyClass cls = new MyClass();
Class c = cls.getClass();
// constructor with arguments as Double and Long
Class[] cArg = new Class[2];
cArg[0] = Double.class;
cArg[1] = Long.class;
Constructor ct = c.getDeclaredConstructor(cArg);
System.out.println("Constructor = " + ct.toString());
}
}
class MyClass {
MyClass() {
System.out.println("no argument constructor");
}
public MyClass(Double d, Long l) {
this.d = d;
this.l = l;
}
Double d = new Double(3.4d);
Long l = new Long(123);
}
The code above generates the following result.