?? classtest.java
字號(hào):
import java.lang.reflect.*;
class ClassTest
{
public static void main(String[] args)
{
/*Point pt=new Point();
Class c1=pt.getClass();
System.out.println(c1.getName());
try
{
Class c2=Class.forName("Point");
System.out.println(c2.getName());
}
catch(Exception e)
{
e.printStackTrace();
}
Class c3=Point.class;
System.out.println(c3.getName());
Class c4=int.class;
System.out.println(c4.getName());
Class c5=Integer.TYPE;
System.out.println(c5.getName());
Class c6=Integer.class;
System.out.println(c6.getName());*/
/*System.out.println("before new Point()");
new Point();
System.out.println("after new Point()");
try
{
Class.forName("Line");
}
catch(Exception e)
{
e.printStackTrace();
}*/
/*if(args.length!=1)
{
return;
}
try
{
Class c=Class.forName(args[0]);
Point pt=(Point)c.newInstance();
pt.output();
}
catch(Exception e)
{
e.printStackTrace();
}*/
if(args.length!=1)
{
return;
}
try
{
Class c=Class.forName(args[0]);
Constructor[] cons=c.getDeclaredConstructors();
/*for(int i=0;i<cons.length;i++)
{
System.out.println(cons[i]);
}
Method[] ms=c.getDeclaredMethods();
for(int i=0;i<ms.length;i++)
{
System.out.println(ms[i]);
}*/
Class[] params=cons[0].getParameterTypes();
Object[] paramValues=new Object[params.length];
for(int i=0;i<params.length;i++)
{
if(params[i].isPrimitive())
{
paramValues[i]=new Integer(i+3);
}
}
Object o=cons[0].newInstance(paramValues);
Method[] ms=c.getDeclaredMethods();
ms[0].invoke(o,null);
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
class Point
{
static
{
System.out.println("Loading Point");
}
int x,y;
void output()
{
System.out.println("x="+x+","+"y="+y);
}
Point(int x,int y)
{
this.x=x;
this.y=y;
}
}
class Line
{
static
{
System.out.println("Loading Line");
}
}
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