\u4ee5\u4e0b\u662fJava\u8bed\u8a00\u6700\u6709\u7279\u8272\u7684\u51e0\u4e2a\u7279\u6027\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u6309\u7279\u6027\u5206\u7ec4\u5c55\u793a\uff1a<\/p>\n
Java\u662f\u4e00\u79cd\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u652f\u6301\u5c01\u88c5\u3001\u7ee7\u627f\u548c\u591a\u6001\u7b49\u9762\u5411\u5bf9\u8c61\u7684\u7279\u6027\u3002<\/p>\n
\/\/ \u5c01\u88c5\nclass Car {\n private String brand;\n private int price;\n\n public void setBrand(String brand) {\n this.brand = brand;\n }\n\n public void setPrice(int price) {\n this.price = price;\n }\n\n public void displayInfo() {\n System.out.println("Brand: " + brand);\n System.out.println("Price: " + price);\n }\n}\n\n\/\/ \u7ee7\u627f\nclass ElectricCar extends Car {\n private int batteryCapacity;\n\n public void setBatteryCapacity(int batteryCapacity) {\n this.batteryCapacity = batteryCapacity;\n }\n\n public void displayInfo() {\n super.displayInfo();\n System.out.println("Battery Capacity: " + batteryCapacity);\n }\n}\n\n\/\/ \u591a\u6001\npublic class Main {\n public static void main(String[] args) {\n Car car1 = new Car();\n car1.setBrand("Toyota");\n car1.setPrice(20000);\n car1.displayInfo();\n\n ElectricCar car2 = new ElectricCar();\n car2.setBrand("Tesla");\n car2.setPrice(50000);\n car2.setBatteryCapacity(75);\n car2.displayInfo();\n }\n}<\/code><\/pre>\n\u5f02\u5e38\u5904\u7406 (Exception Handling)<\/h4>\n
Java\u901a\u8fc7\u5f02\u5e38\u5904\u7406\u673a\u5236\u6765\u5904\u7406\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u51fa\u73b0\u7684\u5f02\u5e38\u60c5\u51b5\u3002<\/p>\n
import java.io.File;\nimport java.io.FileNotFoundException;\nimport java.util.Scanner;\n\npublic class Main {\n public static void main(String[] args) {\n try {\n File file = new File("input.txt");\n Scanner scanner = new Scanner(file);\n while (scanner.hasNextLine()) {\n String line = scanner.nextLine();\n System.out.println(line);\n }\n scanner.close();\n } catch (FileNotFoundException e) {\n System.out.println("File not found.");\n }\n }\n}<\/code><\/pre>\n\u591a\u7ebf\u7a0b (Multithreading)<\/h4>\n
Java\u63d0\u4f9b\u4e86\u591a\u7ebf\u7a0b\u7f16\u7a0b\u7684\u652f\u6301\uff0c\u53ef\u4ee5\u540c\u65f6\u6267\u884c\u591a\u4e2a\u7ebf\u7a0b\u6765\u5b9e\u73b0\u5e76\u53d1\u64cd\u4f5c\u3002<\/p>\n
class MyThread extends Thread {\n private String name;\n\n public MyThread(String name) {\n this.name = name;\n }\n\n public void run() {\n for (int i = 0; i < 5; i++) {\n System.out.println(name + ": " + i);\n try {\n Thread.sleep(500);\n } catch (InterruptedException e) {\n e.printStackTrace();\n }\n }\n }\n}\n\npublic class Main {\n public static void main(String[] args) {\n MyThread thread1 = new MyThread("Thread 1");\n MyThread thread2 = new MyThread("Thread 2");\n\n thread1.start();\n thread2.start();\n }\n}<\/code><\/pre>\n\u6cdb\u578b (Generics)<\/h4>\n
Java\u7684\u6cdb\u578b\u673a\u5236\u5141\u8bb8\u5728\u7f16\u8bd1\u65f6\u6307\u5b9a\u7c7b\u578b\u53c2\u6570\uff0c\u589e\u52a0\u4ee3\u7801\u7684\u53ef\u91cd\u7528\u6027\u548c\u7c7b\u578b\u5b89\u5168\u6027\u3002<\/p>\n
import java.util.ArrayList;\nimport java.util.List;\n\npublic class Main {\n public static void main(String[] args) {\n List<String> names = new ArrayList<>();\n names.add("Alice");\n names.add("Bob");\n names.add("Charlie");\n\n for (String name : names) {\n System.out.println(name);\n }\n }\n}<\/code><\/pre>\n\u5f53\u7136\uff01\u4ee5\u4e0b\u662f\u66f4\u591aJava\u8bed\u8a00\u6700\u6709\u7279\u8272\u7684\u7f16\u7801\u7279\u6027\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u6309\u7279\u6027\u5206\u7ec4\u5c55\u793a\uff1a<\/p>\n
Lambda\u8868\u8fbe\u5f0f<\/h4>\n
Java 8\u5f15\u5165\u4e86Lambda\u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u7b80\u6d01\u5730\u7f16\u5199\u533f\u540d\u51fd\u6570\uff0c\u5e76\u7528\u4e8e\u51fd\u6570\u5f0f\u7f16\u7a0b\u548c\u96c6\u5408\u64cd\u4f5c\u3002<\/p>\n
import java.util.Arrays;\nimport java.util.List;\n\npublic class Main {\n public static void main(String[] args) {\n List<String> names = Arrays.asList("Alice", "Bob", "Charlie");\n\n names.forEach(name -> System.out.println(name));\n\n List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);\n int sum = numbers.stream()\n .filter(n -> n % 2 == 0)\n .mapToInt(n -> n)\n .sum();\n\n System.out.println("Sum of even numbers: " + sum);\n }\n}<\/code><\/pre>\nStream API<\/h4>\n
Java 8\u5f15\u5165\u4e86Stream API\uff0c\u63d0\u4f9b\u4e86\u4e00\u79cd\u6d41\u5f0f\u64cd\u4f5c\u96c6\u5408\u7684\u65b9\u5f0f\uff0c\u652f\u6301\u51fd\u6570\u5f0f\u7f16\u7a0b\u548c\u5e76\u884c\u5904\u7406\u3002<\/p>\n
import java.util.Arrays;\nimport java.util.List;\n\npublic class Main {\n public static void main(String[] args) {\n List<String> names = Arrays.asList("Alice", "Bob", "Charlie");\n\n long count = names.stream()\n .filter(name -> name.length() > 4)\n .count();\n\n System.out.println("Count of names with more than 4 characters: " + count);\n }\n}<\/code><\/pre>\nOptional\u7c7b<\/h4>\n
Java 8\u5f15\u5165\u4e86Optional\u7c7b\uff0c\u7528\u4e8e\u5904\u7406\u53ef\u80fd\u4e3a\u7a7a\u7684\u503c\uff0c\u907f\u514d\u4e86\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/p>\n
import java.util.Optional;\n\npublic class Main {\n public static void main(String[] args) {\n Optional<String> name = Optional.ofNullable(getName());\n\n if (name.isPresent()) {\n System.out.println("Name: " + name.get());\n } else {\n System.out.println("Name not found");\n }\n }\n\n public static String getName() {\n return "Alice";\n }\n}<\/code><\/pre>\n\u6ce8\u89e3 (Annotations)<\/h4>\n
Java\u652f\u6301\u4f7f\u7528\u6ce8\u89e3\uff08Annotations\uff09\u6765\u4e3a\u7a0b\u5e8f\u5143\u7d20\u6dfb\u52a0\u5143\u6570\u636e\uff0c\u5e76\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5185\u7f6e\u7684\u6ce8\u89e3\uff0c\u5982@Override\u548c@Deprecated\u7b49\u3002<\/p>\n
import java.util.ArrayList;\nimport java.util.List;\n\n@SuppressWarnings("unused")\npublic class Main {\n @Deprecated\n public static void oldMethod() {\n System.out.println("This method is deprecated.");\n }\n\n public static void main(String[] args) {\n List<String> names = new ArrayList<>();\n\n names.add("Alice");\n names.add("Bob");\n\n \/\/ \u4f7f\u7528\u4e86@SuppressWarnings\u6ce8\u89e3\uff0c\u5ffd\u7565\u7f16\u8bd1\u5668\u7684\u8b66\u544a\n names.forEach(System.out::println);\n\n \/\/ \u4f7f\u7528\u4e86@Deprecated\u6ce8\u89e3\uff0c\u8868\u793a\u8be5\u65b9\u6cd5\u5df2\u7ecf\u8fc7\u65f6\n oldMethod();\n }\n}<\/code><\/pre>\n\u5f53\u7136\uff01\u4ee5\u4e0b\u662f\u66f4\u591aJava\u8bed\u8a00\u6700\u6709\u7279\u8272\u7684\u7f16\u7801\u7279\u6027\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u6309\u7279\u6027\u5206\u7ec4\u5c55\u793a\uff1a<\/p>\n
\u53cd\u5c04 (Reflection)<\/h4>\n
Java\u7684\u53cd\u5c04\u673a\u5236\u5141\u8bb8\u5728\u8fd0\u884c\u65f6\u68c0\u67e5\u548c\u64cd\u4f5c\u7c7b\u3001\u5bf9\u8c61\u548c\u65b9\u6cd5\u7b49\u4fe1\u606f\u3002<\/p>\n
import java.lang.reflect.Constructor;\nimport java.lang.reflect.Field;\nimport java.lang.reflect.Method;\n\npublic class Main {\n public static void main(String[] args) throws Exception {\n \/\/ \u83b7\u53d6\u7c7b\u7684\u4fe1\u606f\n Class<?> clazz = Class.forName("com.example.Person");\n System.out.println("Class Name: " + clazz.getName());\n\n \/\/ \u83b7\u53d6\u6784\u9020\u51fd\u6570\n Constructor<?> constructor = clazz.getConstructor(String.class, int.class);\n Object person = constructor.newInstance("Alice", 25);\n\n \/\/ \u83b7\u53d6\u5b57\u6bb5\n Field nameField = clazz.getDeclaredField("name");\n nameField.setAccessible(true);\n System.out.println("Name: " + nameField.get(person));\n\n \/\/ \u8c03\u7528\u65b9\u6cd5\n Method helloMethod = clazz.getDeclaredMethod("hello");\n helloMethod.invoke(person);\n }\n}\n\nclass Person {\n private String name;\n private int age;\n\n public Person(String name, int age) {\n this.name = name;\n this.age = age;\n }\n\n private void hello() {\n System.out.println("Hello, " + name);\n }\n}<\/code><\/pre>\n\u5e8f\u5217\u5316 (Serialization)<\/h4>\n
Java\u7684\u5e8f\u5217\u5316\u673a\u5236\u5141\u8bb8\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5b57\u8282\u6d41\u8fdb\u884c\u5b58\u50a8\u6216\u4f20\u8f93\uff0c\u5e76\u5728\u9700\u8981\u65f6\u91cd\u65b0\u6784\u9020\u5bf9\u8c61\u3002<\/p>\n
import java.io.*;\n\npublic class Main {\n public static void main(String[] args) throws IOException, ClassNotFoundException {\n \/\/ \u5bf9\u8c61\u5e8f\u5217\u5316\n Person person = new Person("Alice", 25);\n FileOutputStream fileOut = new FileOutputStream("person.ser");\n ObjectOutputStream out = new ObjectOutputStream(fileOut);\n out.writeObject(person);\n out.close();\n fileOut.close();\n\n \/\/ \u5bf9\u8c61\u53cd\u5e8f\u5217\u5316\n FileInputStream fileIn = new FileInputStream("person.ser");\n ObjectInputStream in = new ObjectInputStream(fileIn);\n Person deserializedPerson = (Person) in.readObject();\n in.close();\n fileIn.close();\n\n System.out.println("Name: " + deserializedPerson.getName());\n System.out.println("Age: " + deserializedPerson.getAge());\n }\n}\n\nclass Person implements Serializable {\n private String name;\n private int age;\n\n public Person(String name, int age) {\n this.name = name;\n this.age = age;\n }\n\n public String getName() {\n return name;\n }\n\n public int getAge() {\n return age;\n }\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u4ee5\u4e0b\u662fJava\u8bed\u8a00\u6700\u6709\u7279\u8272\u7684\u51e0\u4e2a\u7279\u6027\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u6309\u7279\u6027\u5206\u7ec4\u5c55\u793a\uff1a \u9762\u5411\u5bf9\u8c61\u7f16\u7a0b (OOP) Java\u662f\u4e00\u79cd\u9762\u5411 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[107,1],"tags":[119],"_links":{"self":[{"href":"https:\/\/fugary.com\/index.php?rest_route=\/wp\/v2\/posts\/503"}],"collection":[{"href":"https:\/\/fugary.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fugary.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fugary.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fugary.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=503"}],"version-history":[{"count":1,"href":"https:\/\/fugary.com\/index.php?rest_route=\/wp\/v2\/posts\/503\/revisions"}],"predecessor-version":[{"id":504,"href":"https:\/\/fugary.com\/index.php?rest_route=\/wp\/v2\/posts\/503\/revisions\/504"}],"wp:attachment":[{"href":"https:\/\/fugary.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fugary.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fugary.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}