获取构造器的信息

获取类构造器的用法与上述获取方法的用法类似，如：

import java.lang.reflect.*;public class constructor1 {public constructor1() {}protected constructor1(int i, double d) { } public static void main(String args[]) { try { Class cls = Class.forName("constructor1"); Constructor ctorlist[] = cls.getDeclaredConstructors(); for (int i = 0; i < ctorlist.length; i++) { Constructor ct = ctorlist[i]; System.out.println("name = " + ct.getName()); System.out.println("decl class = " + ct.getDeclaringClass()); Class pvec[] = ct.getParameterTypes(); for (int j = 0; j < pvec.length; j++) System.out.println("param #" + j + " " + pvec[j]); Class evec[] = ct.getExceptionTypes(); for (int j = 0; j < evec.length; j++) System.out.println("exc #" + j + " " + evec[j]); System.out.println("-----"); } } catch (Throwable e) { System.err.println(e); } } } 

这个例子中没能获得返回类型的相关信息，那是因为构造器没有返回类型。

这个程序运行的结果是：

name = constructor1decl class = class constructor1-----name = constructor1decl class = class constructor1param #0 int param #1 double