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Articles by Vikyath Ram
Page 4 of 10
How to initialize and compare strings?
Following example compares two strings by using str compareTo (string), str compareToIgnoreCase(String) and str compareTo(object string) of string class and returns the ascii difference of first odd characters of compared strings.Examplepublic class StringCompareEmp{ public static void main(String args[]) { String str = "Hello World"; String anotherString = "hello world"; Object objStr = str; System.out.println( str.compareTo(anotherString) ); System.out.println( str.compareToIgnoreCase(anotherString) ); System.out.println( str.compareTo(objStr.toString())); } }OutputThe above code sample will produce the following result.-32 0 0String compare by equals()This method compares this ...
Read MoreDifference between super() and this() in Java
Following are the notable differences between super() and this() methods in Java. super()this()Definitionsuper() - refers immediate parent class instance.this() - refers current class instance.InvokeCan be used to invoke immediate parent class method.Can be used to invoke current class method.Constructorsuper() acts as immediate parent class constructor and should be first line in child class constructor.this() acts as current class constructor and can be used in parametrized constructors.OverrideWhen invoking a superclass version of an overridden method the super keyword is used.When invoking a current version of an overridden method the this keyword is used.Exampleclass Animal { String name; Animal(String name) { ...
Read MoreShould a constructor always have the same name as the class in java?
Yes, the constructor should always have the same name as the class. Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. Mostly it is used to instantiate the instance variables of a class. If the programmer doesn’t write a constructor the compiler writes a constructors on his behalf. Example public class Sample{ public Sample(){ System.out.println("This is a constructor"); } public static void main(String args[]){ Sample obj = new Sample(); } } Output This is a constructor
Read MoreFactorial program in Java without using recursion.
Following is the required program.Examplepublic class Tester { static int factorial(int n) { if (n == 0) return 1; else return (n * factorial(n - 1)); } public static void main(String args[]) { int i, fact = 1; int number = 5; fact = factorial(number); System.out.println(number + "! = " + fact); } }Output5! = 120
Read MoreJava DatabaseMetaData getTimeDateFunctions() method with example
In this article, we will learn how to retrieve the list of time and date functions in the database using the getTimeDateFunctions() method of the DatabaseMetaData class in Java. getTimeDateFunctions() The getTimeDateFunctions() method retrieves the list of time and date functions supported by the current database. The names returned by this method are the Open CLI time and date function names. Steps to Retrieve Time and Date Functions in Database To get the list of the time and date functions supported by the underlying database − Step 1: Register the Driver: Make sure your database is ...
Read MoreJava sql.Time setTime() method with example
In this article, we will learn the usage of the setTime() method in Java with a complete example. Handling time-related data is an essential aspect of many Java applications, especially when interacting with databases. The java.sql.Time class, designed to handle SQL TIME values. What is setTime() method The setTime() method of the java.util.Time class accepts a variable of long type, representing the number of milliseconds from the epoch time (January 1, 1970, 00:00:00.000 GMT) to the required time, and sets the specified time value to the current Time object. //Setting time time.setTime(time_value_in_long); Use Cases of setTime() Following are the use ...
Read MoreJava DatabaseMetaData getPrimaryKeys() method with example
DatabaseMetaData DatabaseMetaData is an interface that provides methods to access metadata about the database itself. getPrimaryKeys() method The getPrimaryKeys() method of the DatabaseMetaData interface in Java is used to retrieve information about the primary keys of a table in a database. A primary key is a unique identifier for each record in a table. It accepts 3 parameters − catalog - A string parameter representing the name of the catalog (database in general) in which the table exists, pass "" to get the description of the ...
Read MoreJava sql.Time toString() method with example
In this article, you'll learn how to convert a Time object into a String using the toString() method from the java.sql.Time class. This method allows us to easily transform a Time object into its JDBC escape format, which can then be handled as a string. //Retrieving the Time object Time timeObj = rs.getTime("DeliveryTime"); //Converting the Time object to String format String time = timeObj.toString(); Steps for using Java sql.Time toString() Method Following are the steps for using Java sql.Time toString() Method − Create a MySQL table named dispatches. Insert some sample records into ...
Read MoreJava sql.Time valueOf() method with example
In this program, we'll demonstrate how to insert and retrieve records from a MySQL database using JDBC . Specifically, we'll focus on how to convert a time value from a String format into a java.sql.Time object using the valueOf() method. This allows us to store time values in a database and retrieve them accurately. Time time = Time.valueOf("time_string"); Steps to Use sql.Time valueOf() Method Following are the steps to use sql.Time valueOf() method − Import all the useful classes. Register the Driver by loading the MySQL JDBC driver. ...
Read MoreJava ResultSet isLast() method with example
When we execute certain SQL queries (SELECT query in general) they return tabular data. The java.sql.ResultSet interface represents such tabular data returned by the SQL statements i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which requires the database (executeQuery() method of the Statement interface in general). The ResultSet object has a cursor/pointer which points to the current row. Initially, this cursor is positioned before the first row. Java ResultSet isLast() Method The isLast() method of the ResultSet interface is used to determine whether the cursor is on the last row of the ...
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