java使用反射调用类方法

Question

我现在的程序如下:

 public class Ob {
    private String classPath;
    private String methodName;
    private Map<String, Object> para;

}
class Demo2 {
    public void print(String string) {
        System.out.print(string+"demo2");
    }
}
class Demo {
    public void print(String string,int i) {
        System.out.print(string+i+"demo1");
    }
}

我想编写一个方法:它接收ob对象,根据ob对象的属性反射调用其他类的方法,调用的实参由ob的para获得. 我想到的是使用map设置实参,或者你有更好的办法也可以.
请问如何实现?可以帮我完成这个demo么?

Answer 1

public static void main(String[] args) throws Exception {
// Ob ob = new Ob("test.pd.Demo2","print","hahaha");
Ob ob = new Ob("test.pd.Demo","print","hahaha",25);
Class<?> cal = Class.forName(ob.getClassPath());
System.out.println("cal:"+cal);
Object[] params = ob.getPara();
List> cals = new ArrayList>(params.length);
for (Object param : params) {
cals.add(param.getClass());
}
Method method = cal.getMethod(ob.getMethodName(),cals.toArray(new Class[]{}));
System.out.println(method);
method.invoke(cal.newInstance(),params);
}

注意：将public void print(String string,int i)修改为public void print(String string,Integer i)