标签：cep object 赋值 www nes OLE nec code image
https://www.youtube.com/watch?v=uEHJ5CHaF08
主要顺便练练英文
YouTube上真的很多超赞的视频，有关语言特性的，架构的，代码整洁的...最近一直在每天花一个小时左右看英文相关的speak，然后基本每天会看一下medium的文章，练英文。
1.接口的deafault method and private method
public interface MyInterface { default void defaultMethod() { privateMethod(); } private void privateMethod() { System.out.println("private method for default method"); } }
public class MyClass implements MyInterface { public static void main(String[] args) { new MyClass().defaultMethod(); } }
输出
private method for default method
这里是不能通过实现类调用接口的private方法的，private的意思本来就是类私有，对象私有。
2.try-with-resource
public class Reader { private void readFile (String file) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file))); try (reader) { String line; while ((line = reader.readLine()) != null) { System.out.println(line); } } } public static void main(String[] args) throws IOException { new Reader().readFile("D:\\program\\java project\\Java8InAction\\src\\main\\java\\clean\\MyInterface.java"); // trasferTo can do the same thing like readFile new FileInputStream("D:\\program\\java project\\Java8InAction\\src\\main\\java\\clean\\MyInterface.java").transferTo(System.out); } }
输出，两次都是一样的输出，读的文件为上面的接口类
package clean; public interface MyInterface { default void defaultMethod() { privateMethod(); } private void privateMethod() { System.out.println("private method for default method"); } }
这里第三点的确需要改进，比如最近的项目就规定必须要用helper objects for reading or writing file
3.switch expressions
boolean result = switch(ternaryBool) { case TRUE -> true; case FALSE -> false; case FILE_NOT_FOUND -> throw new UncheckedIOException( "This is ridiculous!", new FileNotFoundException()); // as we‘ll see in "Exhaustiveness", `default` is not necessary default -> throw new IllegalArgumentException("Seriously?! ??"); };
如果不加变量赋值这种，还可以直接do something
switch (x) { case 1, 2, 4 -> System.out.println("Foo"); default -> System.out.println("Bar"); }
4.local variable
writing clean code with modern java
标签：cep object 赋值 www nes OLE nec code image
原文地址：https://www.cnblogs.com/CherryTab/p/12203660.html
