I am new to reflection in java and I thought that since I provided the arguments to the EnemyShip constructor that will be preserved. And After changing just the name of the ship, only that will be changed. However, I got wentworth is travelling at 0 instead of what I expected : wentworth is travelling at at 3242
Last line of code should in reflectionTest be main focus
I have 2 classes:
package com.reflectionapi.demo;
import java.lang.reflect.*;
public class reflectionTest {
public static void main(String[] args) {
Class shipClass = EnemyShip.class;
int shipMod= shipClass.getModifiers();
String shipModStat="";
switch(shipMod){
case Modifier.PUBLIC: shipModStat="Public";
break;
case Modifier.PRIVATE: shipModStat="Private";
}
System.out.println(shipClass.getName()+" "+shipModStat
);//prints class of ship
Method[] methods = shipClass.getMethods();
Class[] parameters;
for (Method method: methods){
String methodName = method.getName();
parameters= method.getParameterTypes();// assign method parameters to paramters array
if (methodName.startsWith("get"))
System.out.println(methodName+" is a Getter Method "+
"it returns "+ method.getReturnType()+"\n");
else
if (methodName.startsWith("set"))
for (Class param: parameters){
System.out.println(methodName+" is a Setter Method and "+
"takes parameters "+ param.getName()+"\n");
}
}
Class superClass = shipClass.getSuperclass();
System.out.println(shipClass+" is a subclass of "+ superClass.getName()+"\n");
Constructor[] constructors = shipClass.getConstructors();
//Constructor constructors = shipClass.getConstructor(new Class[] {EnemyShip.class} ); not iterable
Object constructorItem =null;
for (Constructor construct: constructors){
System.out.println(construct);
}
try {
constructorItem= shipClass.getConstructor(String.class , int.class ).newInstance("XT-1800", 5000);
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException
| NoSuchMethodException | SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
EnemyShip ship = new EnemyShip("Carl", 3242);
ship.setName("Wentworth");
//ship.setSpeed(1230420);
System.out.println(ship.getName()+
" is travelling at "+
ship.getSpeed());
}
}
Second class
package com.reflectionapi.demo;
public class EnemyShip {
public EnemyShip (String s, int m){// s= name m= speed
/*
name =s;
speed=m;
try later */
System.out.println(s+
" is travelling at :"+ m);
}
public EnemyShip (String s, int m, double j){// s= name m= speed
System.out.println(s+
" is travelling at :"+ m);
}
public String getName (){
return name ;
}
public void setName(String s){
name =s;
}
public void setSpeed(int s){
speed =s;
}
public int getSpeed(){
return speed;
}
private String name ="";
private int speed=0;
}
