Type Casting (Part 6)

Java Type Casting

Type casting is when you assign a value of one primitive data type to another type.

In Java, there are two types of casting:

1. Widening Casting

Widening casting also called as Implicit Casting is done automatically when passing a smaller size type to a larger size type:

Eg:-

  public class MyClass {   
  public static void main(String[] args) {   
   int myInt = 10;   
   double myDouble = myInt; // Automatic casting: int to double   
   System.out.println(myInt);     
   System.out.println(myDouble);    
  }   
  }

Output:-

  10   
  10.0


2.Narrowing Casting

Narrowing casting also called as Explicit Casting must be done manually by placing the type in parentheses in front of the value:

eg:-
  public class MyClass {   
  public static void main(String[] args) {   
   double myDouble = 10.78;   
   int myInt = (int) myDouble; // Manual casting: double to int   
   System.out.println(myDouble);    
   System.out.println(myInt);     
  }   
  }
Output:-
  10.78   
  10


Parse( )

Parse( ) is also used to convert a data-type to another.

1. ParseInt( ) is used to convert a String to an integer.

( You will learn about strings in following tutorials , for now just understand that string is used to store text )

2. ParseDouble( ) is used to convert a String to double.


Eg:-
 public class MyClass {  
      public static void main(String[] args) {  
           String str = "123";  
           int num = Integer.parseInt(str);  
           double num1 = Double.parseDouble(str);  
           System.out.println("String in form of int: " + num);  
           System.out.println("String in form of double: " + num1);  
      }  
 }
Output:-
 String in form of int: 123  
 String in form of double: 123.0





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