ClassBrowsersandVisual Development EnvironmentsAclassbrowser needstobe abletoenumerate the membersofclasses. Visual development environments can benefitfrommaking useoftype information availableinreflectiontoaid the developerinwriting correct code. DebuggersandTest ToolsDebuggers needtobe abletoexamineprivatememberso...
System.out.println("这是一个正射调用过程Dog id:"+ dog.getId());//二、反射调用过程Classclz=Class.forName("com.learning.java.Dog");ConstructordogConstructor=clz.getConstructor();ObjectdogObj=dogConstructor.newInstance();//方法调用MethodsetIdMethod=clz.getMethod("setId",int.class); setIdMethod....
Method类 Method代表类的方法。 方法 用途 invoke(Object obj, Object... args) 传递object对象及参数调用该对象对应的方法 Constructor类 Constructor代表类的构造方法。 方法 用途 newInstance(Object... initargs) 根据传递的参数创建类的对象 示例 为了演示反射的使用,首先构造一个与书籍相关的model——Book.java,...
获取对象实例方法 Method method = clz.getMethod("eat", String.class); 调用对象实例方法 method.invoke(obj, "meat"); 下面就这五个步骤,进行源码走读 源码走读 Class.forName @CallerSensitive public static Class<?> forName(String className) throws ClassNotFoundException { Class<?> caller = Refle...
main(MethodInvoke.java:17) 接下来,我们来看看invoke()方法的实现过程。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 public Object invoke(Object obj, Object... args) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException { if (!override) { if (!Reflection.quickCheck...
declared Method: public void com.test.reflection.Student.setStudentAge(int) declared Method: private java.lang.String com.test.reflection.Student.show(java.lang.String) method: public void com.test.reflection.Student.setStudentAge(int) method: public final void java.lang.Object.wait(long,int) thr...
其中的set(Object obj, Object value)方法是Field类本身的方法,用于设置字段的值,而get(Object obj)则是获取字段的值,当然关于Field类还有其他常用的方法如下:
// Classic example of reflection usage try { Method m1 = department.getClass().getMethod("getEmployees");Employee employees = (Employee[]) m1.invoke(department);for (Employee employee : employees) { Method m2 = employee.getClass().getMethod("getAddress");Address address = (Address) m2....
调用method.invoke() 方法 @CallerSensitive public Object invoke(Object obj, Object...args) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException { if (!override) { if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { Class <? > caller = Reflection.getCallerClass(); ...
Reflection.ensureMemberAccess(caller, this, null, modifiers); newInstanceCallerCache = caller; } } // 运行构造函数 try { // 默认调用的是无参的构造函数 return tmpConstructor.newInstance((Object[])null); } catch (InvocationTargetException e) { ...