Java如何获取类对象的字段并设置或获取其值？
Refection演示程序，用于获取类的对象的字段并设置或获取其值。
package org.nhooo.example.lang;
import java.util.Date;
import java.lang.reflect.Field;
public class GetSetFieldDemo {
public static Date now;
public Long id;
public String name;
public static void main(String[] args) {
GetSetFieldDemo demo = new GetSetFieldDemo();
Class clazz = demo.getClass();
try {
//获取字段ID，设置其值并回读
Field field = clazz.getField("id");
field.set(demo, new Long(10));
Object value = field.get(demo);
System.out.println("Value = " + value);
//获取静态字段日期，设置其值并回读
field = clazz.getField("now");
field.set(null, new Date());
value = field.get(null);
System.out.println("Value = " + value);
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}