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Programming Articles
Page 2441 of 2547
How to resolve javac is not recognized as an internal or external command in java?
When you compile a program if you see this error it indicates that either you have not installed Java in your system properly or, you haven’t set the Path variable.The Path variable − The path environment variable is used to specify the set of directories which contains executional programs.When you try to execute a program from command line, the operating system searches for the specified program in the current directly, if available, executes it.In case the programs are not available in the current directory, operating system verifies in the set of directories specified in the ‘PATH’ environment variable.Setting Up the ...
Read MoreArrayIndexOutOfBounds Vs ArrayStoreException in Java?
An array is a data structure/container/object that stores a fixed-size sequential collection of elements of the same type. The size/length of the array is determined at the time of creation.The position of the elements in the array is called as index or subscript. The first element of the array is stored at the index 0 and, the second element is at the index 1 and so on.Creating an arrayIn Java, arrays are treated as referenced types you can create an array using the new keyword similar to objects and populate it using the indices as −int myArray[] = new int[7]; ...
Read MoreWhat are the drawbacks of the arrays in Java?
Array is a container which can hold a fix number of items and these items should be of the same type. Most of the data structures make use of arrays to implement their algorithms. Following are the important terms to understand the concept of Array.Element − Each item stored in an array is called an element.Index: Each location of an element in an array has a numerical index, which is used to identify the element.The size of the array will be determined at the time of creation.Disadvantages of arraysDeleting or inserting − You cannot insert a new element at the ...
Read MoreHow do you find continuous sub array whose sum is equal to a given number in Java?
To find continuous sub array whose sum is equal to a given number −Iterate through the array.At each element add the next n elements one by one, when the sum equals to the required value print the sub array.Exampleimport java.util.Arrays; import java.util.Scanner; public class sub_arrays { public static void main(String args[]){ //Reading the array from the user Scanner sc = new Scanner(System.in); System.out.println("Enter the size of the array that is to be created: "); int size = sc.nextInt(); int[] myArray = new int[size]; ...
Read MoreHow do you separate zeros from non-zeros in an integer array using Java?
To separate zeros from non-zeros in an integer array, and push them to the end, you need to rearrange it array by assigning all the nonzero elements to its positions, sequentially, starting from zero. Then, from last position of the array to its end populate it with zeros.ExampleFollowing Java program pushes all the zeros in an array to its end.import java.util.Arrays; import java.util.Scanner; public class ZerosFromNonZeros { public static void main(String args[]){ //Reading the array from the user Scanner sc = new Scanner(System.in); System.out.println("Enter the size of the array that ...
Read MoreHow to find all pairs of elements in Java array whose sum is equal to a given number?
To find all pairs of elements in Java array whose sum is equal to a given number −Add each element in the array to all the remaining elements (except itself).Verify if the sum is equal to the required number.If true, print their indices.Exampleimport java.util.Arrays; import java.util.Scanner; public class sample { public static void main(String args[]){ //Reading the array from the user Scanner sc = new Scanner(System.in); System.out.println("Enter the size of the array that is to be created: "); int size = sc.nextInt(); int[] myArray ...
Read MoreHow to find the missing number in a given Array from number 1 to n in Java?
If a single number is missing in an integer array that contains a sequence of numbers values, you can find it basing of the sum of numbers or, basing on the xor of the numbers.Based on the sum of the numbers −The sum of n sequential numbers will be [n*(n+1)]/2. Using this get the sum of the numbers the n numbers.Add all the elements in the array.Subtract the sum of the numbers in the array from the sum of the n numbers.Exampleimport java.util.Scanner; public class MissingNumber { public static void main(String[] args) { Scanner sc = ...
Read MoreWrite a program to find the first non-repeating number in an integer array using Java?
To find the first non-repeating number in an array −Construct count array to store count of each element in the given array with same length and with initial value 0 for all elements.Compare each element in the array with all other elements, except itself.If match occurs increment its value in the count array.Get the index of the first 0 in the count array and print the element in the input array at this index.Exampleimport java.util.Arrays; public class NonRpeatingArray { public static void main(String args[]) { int array[] = {114, 225, 669, 996, 336, 6547, 669, 225, ...
Read MoreHow to get file URI reference in Java?
The class named File of the java.io package represents a file or directory (path names) in the system. This class provides various methods to perform various operations on files/directories.In general, an URI (Uniform Resource Identifier) represents a resource. The URI class of Java represents this format You can get the URI format of a file by invoking the toURI() method.ExampleFollowing Java example, prints the URI format of the file named samplefile.txtimport java.io.File; import java.io.IOException; import java.net.URI; public class GetURI { public static void main(String args[]) throws IOException { //Instantiating the File class String ...
Read MoreHow many ways can we read data from the keyboard in Java?
The java.io package provides various classes to read write data from various sources and destinations.You can read data from user (keyboard) using various classes such as, Scanner, BufferedReader, InputStreamReader, Console etc.Using Scanner classFrom Java 1.5 Scanner class was introduced. This class accepts a File, InputStream, Path and, String objects, reads all the primitive data types and Strings (from the given source) token by token using regular expressions. By default, whitespace is considered as the delimiter (to break the data into tokens).To read data from keyboard you need to use standard input as source (System.in). For each datatype a nextXXX() is ...
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