The age of a student could be passed as (an object of) String value, Float, Double etc.
#WHY DO I NEED JAVA 8 FULL#
Note: Some messages have been simplified recompile with -Xdiags:verbose to get full output Passing any other object to the constructor of this class generates a compile time exception public static void main(String args) Compile time errorCompile GenericsExample.java:12: error: incompatible types: String cannot be converted to Integer While instantiating this class you can pass an integer object In the following Java example we are defining a class named Student whose constructor (parameterized) accepts an Integer object. To understand generics let us consider an example − Example In other words it is the concept which enables the users to choose the reference type that a method, constructor of a class accepts, dynamically.īy defining a class generic you are making it type-safe i.e. The classes in java.util package handles only objects and hence wrapper classes help in this case also. The objects are necessary if we wish to modify the arguments passed into the method (because primitive types are passed by value ). Generics is a concept in Java where you can enable a class, interface and, method, accept all (reference) types as parameters. Wrapper Class will convert primitive data types into objects. These are also considered as datatypes in Java, unlike other primitive datatypes a literal of these kind of types points/refers to the location of the object. As we know a class is a blue print in which we define the required behaviors and properties and, an interface is similar to class but it is a Specification (containing abstract methods).
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