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  • Java TryWtihResource语句

    当需要关闭资源时,通常会使用try-finally语句

      public void test2() throws Exception {
        Resource resource = new Resource();
        try {
          System.out.println("doing somethings");
        } finally {
          resource.close();     
        }
      }
    

    java7新增了tryWithResource语句专门用于处理资源关闭的情况,基本结构为:try(){}

    public class TryWith {
      private class Resource implements AutoCloseable {
    
        @Override
        public void close() throws Exception {
          System.out.println("resource is closed");
        }
      }
    
      public void test() throws Exception {
        try(Resource resource = new Resource()) {
          System.out.println("doing something");
        }
      }
    
      public static void main(String[] args) throws Exception {
        TryWith tryWith = new TryWith();
        tryWith.test();
      }
    }
    

    括号内用于初始化资源,资源需要实现java.lang.AutoCloseable接口,即实现close()方法。
    括号内可以初始化多个资源,比如try(Resource resource1 = new Resource();Resource resource2 = new Resource()){}

    tryWithResource语句类似Python中的with..as语句

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  • 原文地址:https://www.cnblogs.com/Peter2014/p/12848419.html
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