What is widening and narrowing in java

If the value crosses the maximum prescribed size of a data type, it is called as Overflow and if the value crosses the minimum prescribed size, it is called as Underflow. Java does not throw any error or exception in any of the above cases. For example, an int is of 32 bit in Java, any value that crosses 32 bits gets rolled over, which means after incrementing 1 on max value of int , the returned value will be which is minimum value of int.

Similarly after decrementing 1 from , the result will be which is maximum value of int. For Floating point data types, overflow will result in infinity while underflow results in 0. This is also known as Upcasting. Narrowing refers to passing a higher size data type like int to a lower size data type like short. It may lead to data loss. Casting is required for narrowing conversion.

Following program output will be A " widening " cast is a cast from one type to another, where the "destination" type has a larger range or precision than the "source" e. A " narrowing " cast is the exact opposite long to int. A narrowing cast introduces the possibility of overflow. Asked by: Estelle Hanslmayr technology and computing programming languages What is widening and narrowing in Java discuss with an example?

Last Updated: 1st January, Luca Cipriani Professional. What is difference between implicit and explicit type casting? The basic difference between implicit and explicit type casting is that implicit is taken care of by the compiler itself, while explicit is done by the programmer. In the above statement, the conversion of data from int to double is done implicitly , in other words programmer don't need to specify any type operators.

Edmundo Zahia Professional. What is implicit type conversion? Implicit type conversion is an automatic type conversion done by the compiler whenever data from different types is intermixed.

When an implicit conversion is done, it is not just a reinterpretation of the expression's value but a conversion of that value to an equivalent value in the new type. Consolacion Brandis Professional. Does constructor return any value? No, constructor does not return any value. While declaring a constructor you will not have anything like return type.

In general, Constructor is implicitly called at the time of instantiation. And it is not a method, its sole purpose is to initialize the instance variables. Rachad Fatih Explainer. What is Polymorphism in Java? Polymorphism in Java is a concept by which we can perform a single action in different ways. We can perform polymorphism in java by method overloading and method overriding. If you overload a static method in Java , it is the example of compile time polymorphism.

Here, we will focus on runtime polymorphism in java. Hongyan Soilan Explainer. What is type casting with example? Typecasting , or type conversion, is a method of changing an entity from one data type to another. An example of typecasting is converting an integer to a string. This might be done in order to compare two numbers, when one number is saved as a string and the other is an integer.

Following program output will be Also known as ' automatic type conversion '. Done by the compiler on its own, without any external trigger from the user. Generally takes place when in an expression more than one data type is present. All the data types of the variables are upgraded to the data type of the variable with largest data type.

No, constructor does not return any value. While declaring a constructor you will not have anything like return type. In general, Constructor is implicitly called at the time of instantiation. And it is not a method, its sole purpose is to initialize the instance variables. A widening conversion changes a value to a data type that can allow for any possible value of the original data.

Widening conversions preserve the source value but can change its representation. This occurs if you convert from an integral type to Decimal , or from Char to String. The basic difference between implicit and explicit type casting is that implicit is taken care of by the compiler itself, while explicit is done by the programmer. In the above statement, the conversion of data from int to double is done implicitly , in other words programmer don't need to specify any type operators.

Polymorphism in Java is a concept by which we can perform a single action in different ways. We can perform polymorphism in java by method overloading and method overriding. If you overload a static method in Java , it is the example of compile time polymorphism. Here, we will focus on runtime polymorphism in java.

Type casting in Java is to cast one type , a class or interface, into another type i. Type casting also comes with the risk of ClassCastException in Java , which is quite common with a method which accepts Object type and later types cast into more specific type.

Autoboxing is the automatic conversion that the Java compiler makes between the primitive types and their corresponding object wrapper classes.

For example, converting an int to an Integer, a double to a Double, and so on. If the conversion goes the other way, this is called unboxing. Data type specifies the size and type of values that can be stored in an identifier. The Java language is rich in its data types. Non-primitive—which include Classes, Interfaces, and Arrays.

What are Upcasting and Downcasting in Java? Upcasting Generalization or Widening is casting to a parent type in simple words casting individual type to one common type is called upcasting while downcasting specialization or narrowing is casting to a child type or casting common type to individual type. Widening is replacing one primitive type with another primitive type for assignment-compatibility.