@Test

public void methodTest() {

Class clazz = MyClass.class;

try {

//获取指定方法

//这个注释的会报错
java.lang.NoSuchMethodException

//Method back = clazz.getMethod("back");

Method back = clazz.getMethod("back", String.class);

Method say = clazz.getDeclaredMethod("say", String.class);

//私有方法需要设置

say.setAccessible(true);

MyClass myClass = new MyClass("abc", 99);

//反射调用方法

System.out.println(back.invoke(myClass, "back"));

say.invoke(myClass, "hello world");

} catch (Exception e) {

e.printStackTrace();

}

}

@CallerSensitive

public Object invoke(Object obj, Object... args)

throws IllegalAccessException, IllegalArgumentException,

InvocationTargetException

{

if (!override) {

if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) {

Class<?> caller = Reflection.getCallerClass();

checkAccess(caller, clazz, obj, modifiers);

}

}

MethodAccessor ma = methodAccessor; // read volatile

if (ma == null) {

ma = acquireMethodAccessor();

}

return ma.invoke(obj, args);

}

private static Method searchMethods(Method[] methods,

String name,

Class<?>[] parameterTypes)

{

Method res = null;

String internedName = name.intern();

for (int i = 0; i < methods.length; i++) {

Method m = methods[i];

if (m.getName() == internedName

&& arrayContentsEq(parameterTypes, m.getParameterTypes())

&& (res == null

|| res.getReturnType().isAssignableFrom(m.getReturnType())))

res = m;

}

return (res == null ? res : getReflectionFactory().copyMethod(res));

}

@CallerSensitive

public Object invoke(Object obj, Object... args)

throws IllegalAccessException, IllegalArgumentException,

InvocationTargetException

{

if (!override) {

if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) {

Class<?> caller = Reflection.getCallerClass();

checkAccess(caller, clazz, obj, modifiers);

}

}

MethodAccessor ma = methodAccessor; // read volatile

if (ma == null) {

ma = acquireMethodAccessor();

}

return ma.invoke(obj, args);

}