type casting in Java.

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    2024-02-02T15:04:10+00:00

    Type casting in Java is the process of converting a variable from one type to another. In Java, there are two types of casting:

    1. Widening Casting (Implicit): This occurs when a smaller size data type is converted to a larger size data type. For example, converting an int to a long. This is done automatically by Java.

      int myInt = 9;
      double myDouble = myInt; // Automatic casting: int to double
      System.out.println(myInt);      // Outputs 9
      System.out.println(myDouble);   // Outputs 9.0
      
    2. Narrowing Casting (Explicit): This is when a larger size data type is converted to a smaller size data type. Since it could lead to data loss, it must be done manually by the programmer.

      double myDouble = 9.78;
      int myInt = (int) myDouble; // Manual casting: double to int
      System.out.println(myDouble);   // Outputs 9.78
      System.out.println(myInt);      // Outputs 9
      

    In practice, casting is essential when you need to work with values of different types. However, it's important to use it wisely to avoid data loss or precision issues, especially when doing narrowing casting.

    For instance, when casting a floating-point value to an integer, the fractional part is truncated and not rounded. This might lead to unexpected results or precision loss. Always ensure that the value you're casting fits into the target data type to avoid runtime errors or unexpected behavior.

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