CodeSamplesJava:Java中特定于短功能的代码示例的集合
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【Java编程中的短功能代码示例】 在Java编程中,短功能代码示例通常用于教育、演示或测试特定编程概念。这些代码片段简洁明了,能够帮助开发者快速理解和实现特定的功能,例如数据类型转换、控制流程、类与对象、异常处理、集合框架等。以下是一些Java中常见的关键知识点: 1. **基础语法**: - 变量声明:`int age = 25;` - 数据类型:包括基本类型(如int、double、boolean)和引用类型(如String、Object)。 - 字符串操作:`String str = "Hello"; str.concat("World");` 2. **控制流**: - 条件语句:`if-else`,`switch-case`。 - 循环:`for`,`while`,`do-while`。 - 跳转语句:`break`,`continue`。 3. **函数与方法**: - 方法定义:`public int add(int a, int b) { return a + b; }` - 参数传递:值传递与引用传递(通过对象)。 - 返回值:有返回值与无返回值方法。 4. **类与对象**: - 类定义:`class Person { String name; int age; }` - 对象创建:`Person p = new Person();` - 构造器:用于初始化对象。 - 继承:`class Student extends Person {}` - 多态:通过接口或抽象类实现。 5. **异常处理**: - 异常抛出:`throw new IllegalArgumentException("Invalid argument");` - 异常捕获:`try-catch-finally`块。 6. **集合框架**: - List接口:ArrayList,LinkedList,用于存储有序元素。 - Set接口:HashSet,TreeSet,存储无序且不重复的元素。 - Map接口:HashMap,TreeMap,存储键值对。 - 遍历集合:迭代器(Iterator)与foreach循环。 7. **多线程**: - 创建线程:`Thread t = new Thread(new Runnable() {...});` - 同步机制:`synchronized`关键字,`wait()`, `notify()`和`notifyAll()`。 - 线程池:ExecutorService,ThreadPoolExecutor。 8. **IO流**: - 文件读写:FileReader,FileWriter,BufferedReader,BufferedWriter。 - 流操作:InputStream,OutputStream,Reader,Writer。 - NIO(New IO):Channel,Buffer,Selector。 9. **反射**: - 动态获取类信息:`Class<?> clazz = Class.forName("java.util.ArrayList");` - 创建对象:`Object obj = clazz.newInstance();` - 调用方法:`Method method = clazz.getMethod("add", Object.class); method.invoke(obj, value);` 10. **泛型**: - 泛型类定义:`class Box<T> { T item; }` - 泛型方法:`public <T> void printList(List<T> list) {...}` - 泛型通配符:`? extends Number`,限制类型范围。 11. **模块化系统**(Jigsaw项目): - 模块声明:`module com.example.module { ... }` - 导入模块:`requires com.example.dependency;` - 提供服务:`provides com.example.service.MyService with com.example.impl.MyServiceImpl;` 以上仅是Java编程中部分核心知识点的简要介绍,实际的CodeSamplesJava项目可能包含更多具体示例,涵盖这些领域及其它高级特性,如注解、并发处理、网络编程、数据库操作等。通过这些代码示例,开发者可以加深对Java语言的理解,提高编程效率。
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