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Articles on Trending Technologies
Technical articles with clear explanations and examples
Different ways to concatenate Strings in Java
You can concatenate two strings in Java either by using the concat() method or by using the ‘+’ , the “concatenation” operator.Examplepublic class ConncatSample { public static void main(String []args) { String s1 = "Hello"; String s2 = "world"; String res1 = s1.concat(s2); String res2 = s1+s2; System.out.print("Concatenation using method:: "); System.out.println(res1); System.out.print("Concatenation using operator:: "); System.out.println(res2); } }OutputConcatenation using method:: Helloworld Concatenation using operator:: Helloworld
Read MoreManipulating Strings in Java.
Since String class is immutable once created we cannot modify the data of the string. But still if you want to manipulate string data you can rely on StringBuffer or StringBuilder classes.Examplepublic class Test { public static void main(String args[]) { String str = "Hi welcome "; StringBuffer sb= new StringBuffer(str); sb.append("to Tutorialspoint"); System.out.println(sb); } }OutputHi welcome to Tutorialspoint
Read MoreJava Program to reverse a given String with preserving the position of space.
You can reverse the contents of a given String using leaving the spaces using the reverse() method of the StringBuffer class.Examplepublic class Test { public static void main(String args[]) { String str = "hi welcome to Tutorialspoint"; String strArray[] = str.split(" "); StringBuffer sb= new StringBuffer(str); sb.reverse(); for(int i=0 ; i
Read MoreHow to remove the last character from a string in Java?
The StringBuffer class contains a method known as deleteCharAt(). This method deletes the character at a specified index/position. You can use this method to delete/remove a particular character from a string in Java.Examplepublic class Test { public static void main(String args[]){ String str = "hi welcome to Tutorialspoint"; StringBuffer sb= new StringBuffer(str); sb.deleteCharAt(sb.length()-1); System.out.println(sb); } }Outputhi welcome to Tutorialspoint
Read MoreHow to fetch only a single result from a table in Java-MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20) -> ); Query OK, 0 rows affected (1.37 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(101, 'Chris'); Query OK, 1 row affected (0.54 sec) mysql> insert into DemoTable values(102, 'David'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(103, 'Mike'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select * from DemoTable;This will produce the following output −+------+-------+ | Id ...
Read MoreHow to insert only a single column into a MySQL table with Java?
Use INSERT INTO statement in the Java-MySQL connection code to insert a column.Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.54 sec)Here is the Java code to insert only a single column into a MySQL table.Exampleimport java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; public class InsertOneColumnDemo { public static void main(String[] args) { Connection con = null; PreparedStatement ps = null; try { con = DriverManager.getConnection("jdbc:mysql://localhost:3306/web?" + "useSSL=false", "root", "123456"); ...
Read MoreHow to treat MySQL longtext as integer in MySQL query?
Let us first create a table −mysql> create table DemoTable -> ( -> Value longtext -> ); Query OK, 0 rows affected (0.94 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('778437437447488487476464644433334'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('9998888485775775757577578585'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('8888874757757757757757575675656'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('988757757574646'); Query OK, 1 row affected (0.09 sec)Display all records from the table using select statement −mysql> select * from DemoTable;This will produce the following ...
Read MoreWhat would happen if we run SELECT WHERE columnName = zero in MySQL?
The following syntax will fetch all the values from the column −select * from yourTableName where yourColumnName=0;Let us first create a table −mysql> create table DemoTable1791 ( FirstName varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1791 values('David'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1791 values('John'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1791 values('Carol'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1791;This ...
Read MoreMySQL query to fetch records from a range of months?
Let us first create a table −mysql> create table DemoTable1795 ( Name varchar(20), DueDate date ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1795 values('John', '2018-07-21'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1795 values('Sam', '2019-10-21'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1795 values('Sam', '2019-01-10'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1795 values('Mike', '2018-12-31'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> ...
Read MoreHow to auto increment with 1 after deleting data from a MySQL table?
For this, you can use TRUNCATE TABLE command. Let us first create a table −mysql> create table DemoTable1796 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1796(StudentName) values('Chris Brown'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1796(StudentName) values('David Miller'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1796(StudentName) values('John Doe'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statementmysql> select ...
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