实验 1:利用 JAVA 反射技术分析类结构
实验内容:运行程序,指定一个要分析的类名称,如 java.lang.Double,输出类
中声明的属性、方法、构造函数等。
1.参考代码:
package chap05;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Scanner;
public static void main(String[] args) {
String name;
if (args.length > 0)name = args[0];
else {
Scanner in = new Scanner(System.in);
System.out.println("Enter class name (e.g. java.util.Date): ");
name = in.next();
in.close();
}
try {
Class cl = Class.forName(name);
Class supercl = cl.getSuperclass();
System.out.print("class " + name);
if (supercl != null && supercl != Object.class)
System.out.print(" extends " + supercl.getName());
System.out.print("{");
printConstructors(cl);
System.out.println();
printMethods(cl);
System.out.println();
printFields(cl);
System.out.println("}");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
System.exit(0);
}
/**
* Prints all constructors of a class
* @param cl a class
*/
public static void printConstructors(Class cl) {