獲取構造器的信息

獲取類構造器的用法與上述獲取方法的用法類似，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); } } } 

這個例子中沒能獲得返回類型的相關信息，那是因為構造器沒有返回類型。

這個程序運行的結果是：

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