I'm trying to achieve some sort of reflection in java. I have:
class P {
double t(double x) {
return x*x;
}
double f(String name, double x) {
Method method;
Class<?> enclosingClass = getClass().getEnclosingClass();
if (enclosingClass != null) {
method = enclosingClass.getDeclaredMethod(name, x);
try {
method.invoke(this, x);
} catch (Exception e) {
e.printStackTrace();
}
}
}
class o extends P {
double c() {
return f("t", 5);
}
}
How do I get value from new o().c()?
Putting the dummy class for your reference, you can change your code accordingly-
import java.lang.reflect.Method;
public class Dummy {
public static void main(String[] args) throws Exception {
System.out.println(new Dummy().f("t", 5));
}
double t(Double x) {
return x * x;
}
double f(String name, double x) throws Exception {
double d = -1;
Method method;
Class<?> enclosingClass = getClass();
if (enclosingClass != null) {
method = enclosingClass.getDeclaredMethod(name, Double.class);
try {
Object value = method.invoke(this, x);
d = (Double) value;
} catch (Exception e) {
e.printStackTrace();
}
}
return d;
}
}
Just run this class.
invoke()
method returns the object which is returned after that method execution! so you can try...
Double dd = (Double)method.invoke(this,x);
double retunedVal = dd.doubleValue();
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