core java

Ho In this post, we will see how to end program in java. You can use System.exit(0) to end program in java. Using System.exit() to end java program You can use exit() method of System class to end java program. System.exit() causes Java virtual machine to exit and terminate the current process. You can call System.exit() anywhere in the program, resulting in JVM termination. As System.exit() is the static method of System class, the...

1. Overview Sometimes, when we compile our Java source files, we see “unchecked cast” warning messages printed by the Java compiler. In this tutorial, we're going to take a closer look at the warning message. We'll discuss what this warning means, why we're warned, and how to solve the problem. Some Java compilers suppress unchecked warnings by default. Let's make sure we've enabled the compiler's option to print “unchecked”...

1. Overview Structural design patterns are those that simplify the design of large object structures by identifying relationships between them. They describe common ways of composing classes and objects so that they become repeatable as solutions. The Gang of Four has described seven such structural ways or patterns. In this quick tutorial, we'll see examples of how some core libraries in Java have adopted each one of them. 2....

1. Introduction Recently we looked at Creational Design Patterns and where to find them within the JVM and other core libraries. Now we're going to look at Behavioral Design Patterns. These focus on how our objects interact with each other or how we interact with them. 2. Chain of Responsibility The Chain of Responsibility pattern allows for objects to implement a common interface and for each implementation to delegate on to the...

Spring Framework provides excellent support to call stored procedures from Java application. In fact, there are multiple ways to call stored procedures in Spring Framework, e.g. you can use one of the query() method from JdbcTemplate to call stored procedures, or you can extend abstract class StoredProcedure to call stored procedures from Java. In this Java Spring tutorial, we will see the second approach to call a stored procedure....

In this post, we will how to convert LocalDateTime to Timestamp . Before learning how to convert localdatetime to timestamp, let us learn about LocalDateTime and Timestamp, and understand the importance of this conversion. LocalDateTime LocalDateTime was introcuded in Java 8. LocalDateTime can be imported time package: import java.time.LocalDateTime; LocalDateTime is an immutable object used to represent date in the...