Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles on Trending Technologies
Technical articles with clear explanations and examples
How to get rows and columns of 2D array in Java?
Following example helps to determine the rows and columns of a two-dimensional array with the use of arrayname.length.ExampleFollowing example helps to determine the upper bound of a two dimensional array with the use of arrayname.length. public class Main { public static void main(String args[]) { String[][] data = new String[2][5]; System.out.println("Dimension 1: " + data.length); System.out.println("Dimension 2: " + data[0].length); } }OutputThe above code sample will produce the following result. Dimension 1: 2 Dimension 2: 5
Read MoreHow to convert comma seperated java string to an array.
Yes, use String.split() method to do it. See the example below −Examplepublic class Tester { public static void main(String[] args) { String text = "This,is,a,comma,seperated,string."; String[] array = text.split(","); for(String value:array) { System.out.print(value + " "); } } }OutputThis is a comma seperated string.
Read MoreHow to print a byte array in Java?
You can simply iterate the byte array and print the byte using System.out.println() method.Examplepublic class Tester { public static void main(String[] args) { byte[] a = { 1,2,3}; for(int i=0; i< a.length ; i++) { System.out.print(a[i] +" "); } } }Output1 2 3
Read Morehow to shuffle a 2D array in java correctly?
Yes. Create a list to represent a 2D array and then use Collections.shuffle(list).Exampleimport java.util.ArrayList; import java.util.Collections; import java.util.List; public class Tester { public static void main(String[] args) { List rows = new ArrayList(); rows.add(new int[]{1,2,3}); rows.add(new int[]{4,5,6}); rows.add(new int[]{7,8,9}); System.out.println("Before Shuffle"); System.out.println("[0][0] : " + rows.get(0)[0]); System.out.println("[1][1] : " + rows.get(1)[1]); System.out.println("After Shuffle"); Collections.shuffle(rows); System.out.println("[0][0] : " + rows.get(0)[0]); System.out.println("[1][1] : " + rows.get(1)[1]); } }OutputBefore Shuffle [0][0] : 1 [1][1] : 5 After Shuffle [0][0] : 7 [1][1] : 2
Read MoreHow to create a dynamic 2D array in Java?
If you wish to create a dynamic 2d array in Java without using List. And only create a dynamic 2d array in Java with normal array then click the below linkYou can achieve the same using List. See the below program. You can have any number of rows or columns.Exampleimport java.util.ArrayList; import java.util.List; public class Tester { public static void main(String[] args) { List rows = new ArrayList(); rows.add(new int[]{1, 2, 3}); rows.add(new int[]{1, 2}); ...
Read MoreHow to create a subarray from another array in Java
Use Arrays.copyOfRange() method to get a subarray.Exampleimport java.util.Arrays; public class Tester { public static void main(String[] args) { int[] array = new int[] {1, 2, 3, 4, 5}; int[] subArray = Arrays.copyOfRange(array, 0, 2); System.out.println("Array: "); for(int i = 0; i < array.length; i++) { System.out.print(array[i] + " "); } System.out.println("Sub array: "); for(int i = 0; i < subArray.length; i++) { System.out.print(subArray[i] + " "); } } }OutputArray: 1 2 3 4 5 Sub array: 1 2
Read MoreRemoval of negative numbers from an array in Java
Following program shows how to remove negative numbers from an array.Exampleimport java.util.ArrayList; import java.util.Iterator; import java.util.List; public class Tester { public static void main(String[] args) { List objArray = new ArrayList(); objArray.clear(); objArray.add(2); objArray.add(-3); objArray.add(4); System.out.println("Array before removing an element "+objArray); Iterator iterator = objArray.iterator(); while(iterator.hasNext()) { Integer next = iterator.next(); if(next < 0) { iterator.remove(); } } System.out.println("Array after removing an element"+objArray); } }OutputArray before removing an element [ 2, -3, 4 ] Array after removing an element [ 2, 4 ]
Read Morehow can I declare an Object Array in Java?
Array of Object class can be created which can accept any type of object. During operation on such array, instanceof operator can be used.Examplepublic class Tester { public static void main(String[] args) { Object[] dataArray = new Object[3]; dataArray[0] = new Integer(0); dataArray[1] = new String("1"); dataArray[2] = new Boolean(false); for(Object data: dataArray) { if(data instanceof Integer) { System.out.println(((Integer) data).intValue()); } if(data instanceof String) { System.out.println(data); } if(data instanceof Boolean) { System.out.println(((Boolean) data).booleanValue()); } } } }Output0 1 false
Read MoreHow do you find the sum of all the numbers in a java array
Following program print the sum of the all the numbers in an array.Examplepublic class Tester { public static void main(String[] args) { int[] dataArray = {1, 2, 3, 4}; int sum = 0; for(int i: dataArray) { sum += i; } System.out.println(sum); } }Output10
Read MoreHow to convert a String to and fro from UTF8 byte array
Following example will showcase conversion of a Unicode String to UTF8 byte[] and UTF8 byte[] to Unicode byte[] using Reader and Writer classes.ExampleIOTester.javaimport java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.Reader; import java.io.Writer; import java.nio.charset.Charset; import java.text.ParseException; public class I18NTester { public static void main(String[] args) throws ParseException, IOException { String input = "This is a sample text" ; InputStream inputStream = new ByteArrayInputStream(input.getBytes()); //get the UTF-8 data Reader reader = new InputStreamReader(inputStream, Charset.forName("UTF-8")); ...
Read More