JAVA反射--获取成员变量

代码语言：javascript复制

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;

public class Text {

	 
	public static void main(String[] a){
		try {
			Class class1 = Class.forName("DEmo");
			Field[] fs = class1.getDeclaredFields();//获取所有属性
			for(Field f:fs){
				System.out.print(Modifier.toString(f.getModifiers()) " ");//获取成员变量修饰符
				System.out.print(f.getType().getSimpleName() " ");//获取属性的类型
				System.out.print(f.getName());//获取属性的名字
				System.out.println();
			}
			Constructor constructor = class1.getConstructor();
			DEmo dEmo = (DEmo)constructor.newInstance();
			Field f = class1.getDeclaredField("val");
			f.setAccessible(true);//获取权限
			f.set(dEmo, 3.14);//改变值
			System.out.println(f.get(dEmo));
			
			
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchMethodException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InstantiationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
		catch (InvocationTargetException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchFieldException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
}

java 反射

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