How do you use collections in Java?

How do you use collections in Java?

Consider the following example.

1. import java.util.*;
2. class TestJavaCollection1{
3. public static void main(String args[]){
4. ArrayList list=new ArrayList();//Creating arraylist.
5. list.add(“Ravi”);//Adding object in arraylist.
6. list.add(“Vijay”);
7. list.add(“Ravi”);
8. list.add(“Ajay”);

What are CRUD operations in JDBC?

In this tutorial, we will learn basic database operations (CRUD – Create, Retrieve, Update and Delete) using JDBC (Java Database Connectivity) API. These CRUD operations are equivalent to the CREATE, SELECT, UPDATE and DELETE statements in SQL language.

What is collection framework in Java with example?

The Java collections framework provides a set of interfaces and classes to implement various data structures and algorithms. For example, the LinkedList class of the collections framework provides the implementation of the doubly-linked list data structure.

How do you use CRUD operations?

Four CRUD Operations Components Explained

1. Create. The create function allows users to create a new record in the database.
2. Read. The read function is similar to a search function.
3. Update. The update function is used to modify existing records that exist in the database.
4. Delete.

What is the difference between collection and collections?

Collection is the interface where you group objects into a single unit. Collections is a utility class that has some set of operations you perform on Collection. Collection does not have all static methods in it, but Collections consist of methods that are all static.

How do you write test cases for CRUD operations?

How do you test your CRUD operations?

1. Identify what you are testing. The application we are going to test, is a typical CRUD style application that administrators of web applications are very used to.
2. Make a plan. First up, you want to come up with a test plan so you can get good test coverage.
3. Write some tests.

Which is used to perform CRUD operations?

In CRUD operations, ‘R’ is an acronym for read, which means retrieving or fetching the data from the SQL table. So, we will use the SELECT command to fetch the inserted records from the SQL table. We can retrieve all the records from a table using an asterisk (*) in a SELECT query.

What is difference between smoke and sanity testing?

Important differences: Smoke vs Sanity testing Smoke Testing is performed to ascertain that the critical functionalities of the program are working fine. Sanity testing is done at random to verify that each functionality is working as expected. Smoke testing exercises the entire system from end to end.