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Articles by Krantik Chavan
Page 18 of 18
How to sort an array with customized Comparator in Java?
Let’s say the following is our string array and we need to sort it:String[] str = { "Tom", "Jack", "Harry", "Zen", "Tim", "David" };Within the sort() method, create a customized comparator to sort the above string. Here, two strings are compared with each other and the process goes on:Arrays.sort(str, new Comparator < String > () { public int compare(String one, String two) { int val = two.length() - one.length(); if (val == 0) val = one.compareToIgnoreCase(two); return val; } });Exampleimport java.util.Arrays; import java.util.Comparator; public class Demo ...
Read MoreWhat are the main features of JDBC?
Following are the new features of JDBC:Makes JDBC calls: While using JDBC Java applications can make JDBC calls these calls submit SQL statements to the driver which in turn accesses the data from the database.Portability: JDBC provides wide level portability.Using JDBC you can request any type of queries from the database.You can use JDBC with different Java applications such like Java Applets, Java Servlets, Java Server Pages (JSPs). Enterprise JavaBeans (EJBs). To communicate with database.JDBC provides support for advanced datatypes such as BLOB, CLOB etc.Using JDBC you can set save points for database and layer you can rollback to desired ...
Read MoreExplain the architecture of JDBC?
If you want to develop a Java application that communicates with a database, you should use JDBC API. A driver is the implementation of the said API; various vendors provide various drivers, you need to use a suitable driver with respect to the database you need to communicate with. The driver manager loads the driver and manages the driver.Following are the components of JDBC:JDBC DriverManager: The DriverManager class of the java.sql package manages different types of JDBC drivers. This class loads the driver classes. In addition to this whenever a new connection establishes it chooses and loads the suitable driver ...
Read MoreCreate KeyValue Tuple from another collection in Java
To create KeyValue tuple from another collection, use the fromCollection() method. We will be creating the tuple from List collection. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package.import org.javatuples.KeyValue;Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples.Steps: How to run JavaTuples program in EclipseThe following ...
Read MoreHow many types of JDBC Drivers are there?
There are 4 types of JDBC drivers namely, Type-1, Type-2, Type-3 and, Type-4.Type1 It is the ODBC − JDBC bridge driver, it acts as a bridge between JDBC and, ODBC database connectivity mechanism. Using this you can access the databases which support only ODBC. Initially, it is used extensively, since most of the databases supported only ODBC.Whenever Java application sends a request to the JDBC-ODBC bridge driver the request internally calls the ODBC equivalent function and the ODBC driver retrieves the result from the underlying database and sends it back to the JDBC-ODBC bridge driver.Advantages of type1 driverFollowing are the advantages ...
Read MoreIs it possible to divide records in both ascending and descending order in MySQL and display them alternatively?
Yes, you can perform this in MySQL by first getting the middle value. Let us first create a table:mysql> create table DemoTable ( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY ); Query OK, 0 rows affected (0.65 sec)Following is the query to insert some records in the table using insert command:mysql> insert into DemoTable values(); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.16 sec) mysql> ...
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