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  public class MyAutoClosableResource implements AutoCloseable {
  
  
  
      private String resName;
  
      private int counter;
  
  
  
      public MyAutoClosableResource(String resName) {
  
          this.resName = resName;
  
      }
  
  
  
      public String read() throws IOException {
  
          counter++;
  
          if (Math.random() > 0.1) {
  
              return "You got lucky to read from " + resName + " for " + counter + " times...";
  
          } else {
  
              throw new IOException("resource不存在哦");
  
          }
  
      }
  
  
  
      @Override
  
      public void close() throws Exception {
  
          System.out.println("资源释放了:" + resName);
  
      }
  
  }///try是在哪里用什么方法回收资源的啊这个close就输出啊？

  作者回复:
  这个例子只是展示实现了AutoCloseable的实例在新的try语句块中创建, Java会调用它的close方法. 后面会又实际的close的例子.

  2019-08-20

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