Type Coversion in Java

☞When different types of variables and constants are mixed up in an expression, they are converted in one common type implicitly by the compiler. This is called type conversion.

☞Type conversion are in two forms:

1.implicit type conversion
2.explicit type conversion

Implicit Type Conversion

☞An implicit type conversion is a conversion performed by the compiler without programmer’s intervention.

☞It is also known as type promotion or Coercion.

Example

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

int a=10;  
float f=a;     //type promotion						
System.out.println(a);  
System.out.println(f);

}
}

Output

10
10.0

Explicit Type Conversion

☞An explicit type conversion is user-defined that forces an expression to be of specific data type.

☞It is also known as type casting.

Example

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

float f=10.5f;
int a=(int)f; //int a=f;(compile time error)                              
System.out.println(f);  
System.out.println(a);  

}
}

Output

10.5
10

Note : If you will do typecast then it means you are doing forcefully as you can see int a=(int)f; here data is lost but no error.

Permitted Conversion

☞byte to short, int, long, float or double

☞short to int, long, float or double

☞char to int, long, float or double

☞int to long, float or double

☞long to float or double

☞float to double