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Java feature

  1. double brace
  2. ThreadLocal
  3. Instance Initializers
    public class Foo {
      public Foo() {
        System.out.println("constructor called");
      }
     
      static {
        System.out.println("static initializer called");
      }
     
      {
        System.out.println("instance initializer called");
      }
    }
    
  4. Enum – is a class
  5. try, finally, exception
    public static int f() {
        try {
          throw new RuntimeException();
        } finally {
          return 0;
        }
      }
    
  6. URL
    new URL("http://www.yahoo.com").equals(new URL("http://209.191.93.52"))
    

    =true

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