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The openStream() method of the URL class opens a connection and returns an InputStream. Using this stream, you can you read contents from that connection.Exampleimport java.io.InputStream; import java.net.URL; import java.util.Scanner; public class ReadingURL { public static void main(String args[]) throws Exception { URL url = new URL("http://www.tutorialspoint.com/"); InputStream inputStream = url.openStream(); Scanner s = new Scanner(inputStream); while(s.hasNext()) { System.out.println(s.nextLine()); } } }OutputLearn CouchDB Learn DB2 Learn DocumentDB SQL Learn DocumentDB Learn DynamoDB Learn H2 Database Learn HSQLDB Learn IMS DB …………………………………………………………………………………………. ………………………………………………………………………………………………… ………………………………………………………………………………………………
Create an array to which you want to store the existing array with the same length. A 2d array is an array of one dimensional arrays therefore, to copy (or, to perform any operation on) the elements of the 2d array you need two loops one nested within the other. Where, the outer loop is to traverse through the array of one dimensional arrays and, the inner loop is to traverse through the elements of a particular one dimensional array.Examplepublic class Copying2DArray { public static void main(String args[]) { int[][] myArray = {{41, 52, 63}, {74, ... Read More
Using the copyOfRange() method you can copy an array within a range. This method accepts three parameters, an array that you want to copy, start and end indexes of the range.You split an array using this method by copying the array ranging from 0 to length/2 to one array and length/2 to length to other.Exampleimport java.util.Arrays; import java.util.Scanner; public class SplittingAnArray { public static void main(String args[]) { Scanner s =new Scanner(System.in); System.out.println("Enter the required size of the array ::"); int size = s.nextInt(); int [] myArray ... Read More
A 2d array is an array of one dimensional arrays to read the contents of a file to a 2d array –Instantiate Scanner or other relevant class to read data from a file. Create an array to store the contents.To copy contents, you need two loops one nested within the other. the outer loop is to traverse through the array of one dimensional arrays and, the inner loop is to traverse through the elements of a particular one dimensional array.Create an outer loop starting from 0 up to the length of the array. Within this loop read each line trim and ... Read More
Apache Commons provides a library named org.apache.commons.lang3 and, following is the maven dependency to add the library to your project. org.apache.commons commons-lang3 3.0 This package provides a class named ArrayUtils. Using the toPrimitive() method of this class you can convert An object array to an array of primitive types:Exampleimport java.util.Arrays; import org.apache.commons.lang3.ArrayUtils; public class ArraysToPrimitives { public static void main(String args[]) { Integer[] myArray = {234, 76, 890, 27, 10, 63}; int[] primitiveArray = ArrayUtils.toPrimitive(myArray); System.out.println(Arrays.toString(primitiveArray)); } }Output[234, 76, 890, 27, 10, 63]
You can read data from a PDF file using the read() method of the FileInputStream class this method requires a byte array as a parameter.Exampleimport java.io.File; import java.io.FileInputStream; import java.io.ByteArrayOutputStream; public class PdfToByteArray { public static void main(String args[]) throws Exception { File file = new File("sample.pdf"); FileInputStream fis = new FileInputStream(file); byte [] data = new byte[(int)file.length()]; fis.read(data); ByteArrayOutputStream bos = new ByteArrayOutputStream(); data = bos.toByteArray(); } }Sample.pdf
To convert an object to byte arrayMake the required object serializable by implementing the Serializable interface.Create a ByteArrayOutputStream object.Create an ObjectOutputStream object by passing the ByteArrayOutputStream object created in the previous step.Write the contents of the object to the output stream using the writeObject() method of the ObjectOutputStream class.Flush the contents to the stream using the flush() method.Finally, convert the contents of the ByteArrayOutputStream to a byte array using the toByteArray() method.Exampleimport java.io.ByteArrayOutputStream; import java.io.ObjectOutputStream; import java.io.Serializable; class Sample implements Serializable { public void display() { System.out.println("This is a sample class"); } } public ... Read More
In the loop check, the result of i%2 operation on each element if 0 the element is even else the element is odd.ExampleLive Demopublic class OddNumbersInAnArray { public static void main(String args[]) { int[] myArray = {23, 93, 56, 92, 39}; System.out.println("Even numbers in the given array are:: "); for (int i=0; i
Generally, an array is of fixed size and each element is accessed using the indices. For example, we have created an array with size 9. Then the valid expressions to access the elements of this array will be a[0] to a[8] (length-1).Whenever you used an –ve value or, the value greater than or equal to the size of the array, then the ArrayIndexOutOfBoundsException is thrown.For Example, if you execute the following code, it displays the elements in the array asks you to give the index to select an element. Since the size of the array is 7, the valid index ... Read More
To sort a String array in Java, you need to compare each element of the array to all the remaining elements, if the result is greater than 0, swap them.One solution to do so you need to use two loops (nested) where the inner loop starts with i+1 (where i is the variable of outer loop) to avoid repetitions in comparison.ExampleLive Demoimport java.util.Arrays; public class StringArrayInOrder { public static void main(String args[]) { String[] myArray = {"JavaFX", "HBase", "OpenCV", "Java", "Hadoop", "Neo4j"}; int size = myArray.length; for(int i = 0; i