I can't seem to use getConstructor
for constructors with no parameters.
I keep getting the following exception:
java.lang.NoSuchMethodException: classname.<init>()
Here is the code:
interface InfoInterface {
String getClassName();
String getMethodName();
String getArgument();
}
class asa implements InfoInterface {
@Override
public String getClassName() {
return ("jeden");
}
@Override
public String getMethodName() {
return ("metoda");
}
@Override
public String getArgument() {
return ("krzyk");
}
}
class Jeden {
Jeden() {
System.out.println("konstruktor");
}
public void Metoda(String s) {
System.out.println(s);
}
}
class Start {
public static void main(String[] argv) {
if (argv.length == 0) {
System.err.println("Uzycie programu: java Start nazwa_klasy nazwa_klasy2...");
return;
}
try {
for (int x = 0; x < argv.length; x++) {
Class<?> c = Class.forName(argv[x]);
InfoInterface d = (InfoInterface) c.newInstance();
String klasa = d.getClassName();
String metoda = d.getMethodName();
String argument = d.getArgument();
Class<?> o = Class.forName(klasa);
// o.newInstance();
Constructor<?> oCon = o.getConstructor();
System.out.println("ASD");
Class<?> p = (Class<?>) oCon.newInstance();
}
} catch (Exception e) {
System.out.println(e);
}
}
}
o.newInstance();
prints "konstruktor"
without problems.
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