獲取構造器的信息
阿新 • • 發佈:2018-10-01
types getname spa public lis 沒有 out 獲取 exception
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 = constructor1
decl class = class constructor1
-----
name = constructor1
decl class = class constructor1
param #0 int
param #1 double
獲取構造器的信息