Type Casting and Type Conversion in Java

What is Type Conversion ?

• Converting a value from one datatype to another.
• It happens when we convert the smaller datatype into larger datatype.
• It happens automatically by java.
• There is no data loss.
• This is called Implicit Type Conversion or Widening.

Example:

public class Main {
    public static void main(String[] args) {

        int number1 = 10;

        double result = number1;

        System.out.println(result);
    }
}

10.0

• number1 is an integer variable.
• we assigned number1 to result.
• so java automatically converted int to double.

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What is Type Casting?

• Converting a value from one data type to another.
• It happens when we convert a larger data type into a smaller data type.
• It is manually performed by the programmer.
• There may be data loss during conversion.
• This is called Explicit Type Casting or Narrowing Conversion.

Example:

public class Main {
    public static void main(String[] args) {

        double number1 = 10.75;

        int result = (int) number1;

        System.out.println(result);
    }
}

output:

10

• number1 is a double variable.
• We assigned number1 to result using (int).
• So, we manually converted double into int.
• The decimal part .75 is removed.

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