用反射改變屬性的值

用反射改變屬性的值

import java.lang.reflect.*;

public class field2 {
    public double d;

    public static void main(String args[]) {
        try {
            Class cls = Class.forName("field2");
            Field fld = cls.getField("d");
			//fld.isAccessible();//非public屬性要加
            field2 f2obj = new field2();
            System.out.println("d = " + f2obj.d);
            fld.setDouble(f2obj, 12.34);
            System.out.println("d = " + f2obj.d);
        } catch (Throwable e) {
            System.err.println(e);
        }
    }
}