getClass方法是反射机制的基础。反射允许程序在运行时检查类的结构和行为,这对于动态加载类和方法调用非常有用。 publicclassReflectionExample{publicstaticvoidmain(String[]args)throwsException{Class<?>clazz=Class.forName("java.util.ArrayList");Constructor<?>constructor=clazz.getConstructor();Objectinstance=construc...
publicclassMyClass{@OverridepublicStringtoString(){return"This is an object of MyClass";}} 1. 2. 3. 4. 5. 6. 步骤二:使用Object类的getClass方法 接下来,我们需要使用Object类的getClass方法来获取该类的Class对象。 Objectobj=newMyClass();Class<?>clazz=obj.getClass();// 获取该类的Class对象...
publicclassTypeCheck{publicstaticvoidmain(String[]args){Objectobj="Hello";if(obj.getClass().getName().equals("java.lang.String")){System.out.println("This is a String!");}else{System.out.println("This is not a String!");}}} 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 5.getC...
public static void main(String[] args) { EmployeeMark e = new EmployeeMark(); /* public final Class getClass() Returns the runtime class of an object which can be used to describe the class. */ Class cls = e.getClass(); System.out.println("the Class name is: "+ cls.getName()...
默认的hashCode是将内存地址转换为的hash值,重写过后就是自定义的计算方式;也可以通过System.identityHashCode(Object)来返回原本的hashCode。 publicclassHashCodeTest {privateintage;privateString name; @OverridepublicinthashCode() { Object[] a=Stream.of(age, name).toArray();intresult = 1;for(Object element...
设置成true nameField.setAccessible(true); System.out.println("是否可以通过反射访问该字段:" + nameField.isAccessible()); Object name = nameField.get(user); System.out.println("获取到字段的值为:" + name); //设置字段的值 nameField.set(user,"大小小"); System.out.println(user.getName())...
publicclassClassDeclarationSpy {publicstaticvoidmain(String[] args) {try{ Class<?> c = Class.forName("java.util.Date"); out.println("类名:" + c.getCanonicalName()); out.println("修饰符:" + Modifier.toString(c.getModifiers())); ...
Object 类位于 java.lang 包中,编译时会自动导入。package java.lang; Object是类层次结构的根类。我们创建一个类时,如果没有明确继承一个父类,那么它就会自动继承 Object,成为 Object 的子类。the rootof the class hierarchy。 当然了,由于继承的关系,子类可以使用Object的所有方法method。All objectsincludingarra...
1、getClass 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /** * Returns the runtime class of this {@code Object}. The returned * {@code Class} object is the object that is locked by {@code * static synchronized} methods of the represented class. ...
class, int.class); Object person = constructor.newInstance("John", 30); // 访问字段 Field nameField = clazz.getDeclaredField("name"); nameField.setAccessible(true); System.out.println("Name: " + nameField.get(person)); // 修改字段 nameField.set(person, "Doe"); System.out.println("...