Type Casting

Assigning a value of one type to a variable of another type is known as Type Casting.

Example :

int x = 10;
byte y = (byte)x;

In Java, type casting is classified into two types,

  • Widening Casting(Implicit)
  • widening-type-conversion

  • Narrowing Casting(Explicitly done)
  • narrowing-type-conversion


Widening or Automatic type converion

Automatic Type casting take place when,

  • the two types are compatible
  • the target type is larger than the source type

Example :

public class Test
{
    public static void main(String[] args)
    {
      int i = 100;	
      long l = i;	//no explicit type casting required  
      float f = l;	//no explicit type casting required  
      System.out.println("Int value "+i);
      System.out.println("Long value "+l);
      System.out.println("Float value "+f);
    }
    
}

Output :

Int value 100
Long value 100
Float value 100.0

Narrowing or Explicit type conversion

When you are assigning a larger type value to a variable of smaller type, then you need to perform explicit type casting.

Example :

public class Test
{
    public static void main(String[] args)
    {
      double d = 100.04;  
      long l = (long)d;  //explicit type casting required  
      int i = (int)l;	//explicit type casting required  
      
      System.out.println("Double value "+d);
      System.out.println("Long value "+l);
      System.out.println("Int value "+i);
     
    }
    
}

Output :

Double value 100.04
Long value 100
Int value 100

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