java 反射错误

Question

实体类：[/color]public class Hotel {private long id; public long getId() {     return id; } public void setId(long id) {     this.id = id; }}测试方法：public void testReflect() throws Exception{ Object object = Hotel.class.newInstance(); String setMethod = "setId"; Method method = object.getClass().getDeclaredMethod(setMethod, new Class[]{Object.class}); method.invoke(object, new Object[]{1L}); }出错信息java.lang.NoSuchMethodException: setIdat java.lang.ClassCache.findMethodByName(ClassCache.java:247)at java.lang.Class.getDeclaredMethod(Class.java:731)at java.lang.reflect.Method.invokeNative(Native Method)

Answer 1

Method method = object.getClass().getDeclaredMethod(setMethod, new Class[]{[color=red]long.class[/color]});

Answer 2

public void testReflect() throws Exception{ 
Object object = Hotel.class.newInstance(); 
String setMethod = "setId"; 
Method method = object.getClass().getMethod(setMethod); 
method.invoke(object, new Object[]{1L}); 
}

Answer 3

public static void main(String[] args) throws Exception{
Object o = Hotel.class.newInstance();
String setMethod = "setId";
Method[] methods = o.getClass().getMethods();
for(int i=0;i<methods.length;i++){
Method m = methods[i];
// System.out.println(m.getName());
if(m.getName().equals("setId")){
System.out.println("1111");
m.invoke(o, new Object[]{1L});
}

    }
    //method.invoke(o, new Object[]{1L});
}

Answer 4

亲，其实这样写就可以了！
Method method = Hotel.class.getMethod("setId",long.class);