type casting java code example

Example 1: java type casting

// You can typecast to convert a variable of one data type to another.
// Wide Casting converts small data types to larger ones.
// Narrow Casting converts large data types to smaller ones.
// Java can automatically Wide Cast.
// Java will throw an error when trying to automatically Narrow Cast.
// This is because data is often lost when Narrow Casting.
// Narrow Casting must be done manually.

//Wide Cast:
int SomeNumber = 5;
double WideCastedNumber = (double)SomeNumber;

//Narrow Cast:
double SomeNumber = 5.39;
int NarrowCastedNumber = (int)SomeNumber;
//Note: The data that holds the decimal places will be lost!

Example 2: cast java

JAVA: Example of cast:

int SomeNumber = 5; //int 
double WideCastedNumber = (double)SomeNumber; //from int to double

double myDouble = 9.78;
int myInt = (int) myDouble; // from double to int

Example 3: typecasting java

Assigning a value of one type to a variable of another type is
known as Type Casting.
Auto-boxing; is a process when you take a primitive value and
assign into wrapper class object.
Un-boxing; is a process when you take Wrapper class object
and convert to primitive.

Example 4: casting in java

Byte-->short-->char-->Int-->long-->float-->double

Example 5: down casting java

public class Fruit{}  // parent class
public class Apple extends Fruit{}  // child class

public static void main(String args[]) {
    // The following is an implicit upcast:
    Fruit parent = new Apple();
    // The following is a downcast. Here, it works since the variable `parent` is
    // holding an instance of Apple:
    Apple child = (Apple)parent;
}