Java 11 and 12 – New Features

Existing issues with type testing

As a Java developer, you should have worked with code such as the one highlighted in bold in the following block:

Object obj = new Ocean();                         // variable type - Object if (obj instanceof Ocean) {                         // check instance type 
    System.out.println(((Ocean)obj).getBottles());  // cast & extract value 
} 
// A basic class - Ocean  
class Ocean { 
   private long bottles; 
   public long getBottles() { 
         return bottles; 
   } 
}

The preceding code includes three steps to use the value of the bottles variable:

1. obj instanceof Ocean: Testing of the type of ...