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Java Type Casting

 Type casting in Java refers to converting a value of one data type to another. This is often necessary when you're working with different types of variables or objects in your program. Java supports two types of casting:

  1. Implicit Casting (Widening Conversion): This is when you convert a smaller data type into a larger one, as it can be done automatically by the Java compiler without loss of information. For example:
int numInt = 100; double numDouble = numInt; // Implicit casting from int to double
System.out.println(numDouble); // Output: 100.0

  1. Explicit Casting (Narrowing Conversion): This is when you convert a larger data type into a smaller one, which may result in loss of data. It requires explicit declaration and is done by placing the type in parentheses before the value. For example:
double numDouble = 100.55; int numInt = (int) numDouble; // Explicit casting from double to int System.out.println(numInt); // Output: 100

Here are a few more examples demonstrating different types of casting:


// Widening Conversion (Implicit Casting) int intValue = 100; long longValue = intValue; // Implicit casting from int to long float floatValue = longValue; // Implicit casting from long to float double doubleValue = floatValue; // Implicit casting from float to double // Narrowing Conversion (Explicit Casting) double doubleNum = 100.55; int intNum = (int) doubleNum; // Explicit casting from double to int short shortNum = (short) intNum; // Explicit casting from int to short byte byteNum = (byte) shortNum; // Explicit casting from short to byte

Remember, when narrowing conversions are performed, there is a risk of losing data or precision, so be cautious when using explicit casting.

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