Java Type Casting
We are discussing Java type casting with examples, in order to meet learners’ needs.
Java Type Casting
When a value of one primitive data type is assigned to another primitive data type, it is called type casting.
There are two types of casting in Java:
- Widening Casting (automatically) – converting a smaller size data type to a larger size. (Byte -> short -> char -> int -> long -> float -> double)
- Narrowing Casting (manually) – converting a larger size data type to a smaller size. (Double -> float -> long -> int -> char -> short -> byte)
Widening Casting
Widening casting is done automatically when passing a small size to a large size:
Example:
public class Main {
public static void main(String[] args) {
int my_Int_value = 20;
double my_Double = my_Int_value; // Automatic casting: int to double System.out.println(my_Int_value);
System.out.println(my_Double);
}
}
Example:
public class Main {
public static void main(String[] args) {
int my_Int_ample = 17;
long my_long_mrx = my_Int_ample; // Widening casting is applied here which converts int to long
System.out.println("Integer value: "+my_Int_ample);
System.out.println("Long value: "+my_long_mrx);
}
}
Narrowing Casting
Narrowing casting is done manually by placing the type in parentheses before the value:
Example:
public class Main {
public static void main(String[] args) {
double my_Double_value = 126.7d;
byte my_Byte_value = (byte) my_Double_value; // Explicit casting: double to byte System.out.println("Actual Double Value : "+my_Double_value);
System.out.println("After Narrowing casting modified value is: "+my_Byte_value);
}
}
Similarly, we can also convert the double(8 byte) value to float(4 byte):
Example:
public class Main {
public static void main(String[] args) {
double my_Double_value = 437.7241d;
float my_float_value = (float) my_Double_value; // Explicit casting: double to float
System.out.println("Actual Double Value : "+my_Double_value);
System.out.println("After Narrowing casting float value is: "+my_float_value);
}
}
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