You can get the list of files in a directory −Create a directory object using the File class.Get the list of directories in it using the getName() method.Exampleimport java.io.File; public class FindingDirectories {    public static void main(String args[]) {       String dir ="C:/Users/Tutorialspoint/Desktop/movies";       ... Read More

While using FileInputStream, FileOutputStream, and RandomAccessFile classes, we need to pass the path of the file to their constructors. In case of a file in the specified path does not exist a FileNotFoundException is raised.Examplepublic class Sample {    public static void main(String args[]) throws Exception {       ... Read More

You can declare an array just like a variable −int myArray[];You can create an array just like an object using the new keyword −myArray = new int[5];You can initialize the array by assigning values to all the elements one by one using the index −myArray [0] = 101; myArray [1] ... Read More

You can access the private methods of a class using java reflection package.Step1 − Instantiate the Method class of the java.lang.reflect package by passing the method name of the method which is declared private.Step2 − Set the method accessible by passing value true to the setAccessible() method.Step3 − Finally, invoke the method ... Read More

Typecasting is converting one data type to another.Up-casting − Converting a subclass type to a superclass type is known as up casting.Exampleclass Super {    void Sample() {       System.out.println("method of super class");    } } public class Sub extends Super {    void Sample() {   ... Read More

You need to add spaces after or before braces as follows −SELECT  * FROM CNTRB WHERE AGE > 30 AND   CNTRB > 10000 AND NOT ( FUND1 = 'value' AND FUND2 = '0' )

You are trying to use the user-specific setting in your queries, but ABAP does not support it. You need to use ‘.’ as the decimal separator instead of ‘,’.So the query would look something like −SELECT * FROM INTO WHERE amount = 10.15

You have to use parameters correctly in the function. You have to import the file length to an integer value.CALL METHOD cl_gui_frontend_services=>gui_upload_file ...     IMPORTING     filelength = fleng_i ...Next is to write to a character type variable and add parameter i_attachment_size to a class of add attachment.CALL ... Read More

Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or hexadecimal form. They can specify signed or unsigned types and long or short types.In C++ you can use the following code to ... Read More

You can initialize a variable using the assignment operator or use its constructor when initializing it. For example, int i = 0; MyClass instance(1, "Hello");It will be automatically initialized ifIt's a class/struct instance in which the default constructor initializes all primitive types; like MyClass instance; You use array initializer syntax, e.g. ... Read More