journaldev.com/3531/spring-mvc-hibernate-mysql-integration-crud-example-tutorial
journaldev.com/3531/spring-mvc-hibernate-mysql-integration-crud-example-tutorial
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Codity Test and results
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Wildcard in Java Generics
he ? (question mark) symbol represents the wildcard element. It means any type. If we write <? extends Number>, it means any child class of Number, e.g., Integer, Float, and double. Now we can call the method of Number class through any child class object. We can use a wildcard as a type of a parameter, field, return type, or local variable. However, it is not allowed to use a wildcard as a type argument for a generic method invocation, a generic class instance creation, or a supertype . Let's understand it by the example given below: import java.util.*; abstract class Shape{ abstract void draw(); } class Rectangle extends Shape{ void draw(){System.out.println( "drawing rectangle" );} } class Circle extends Shape{ void draw(){System.out.println( "drawing circle" );} ...
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