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The following code does the replacement in the given text file. After the replacement, the text is written to a new text file 'bar.txt'Examplef1 = open('foo.txt', 'r') f2 = open('bar.txt', 'w') for line in f1: print line f2.write(line.replace('Poetry', 'Prose')) f2 = open('bar.txt', 'r') for line in f2: print line, f1.close() f2.close()OutputThis gives the outputPoetry is often considered the oldest form of literature. Poetry today is usually written down, but is still sometimes performed. Prose is often considered the oldest form of literature. Prose today is usually written down, but is still sometimes performed.Read More
In Java, Arrays are of fixed size. The size of the array will be decided at the time of creation. But if you still want to create Arrays of variable length you can do that using collections like array list.Exampleimport java.util.ArrayList; import java.util.Arrays; import java.util.Scanner; public class AddingItemsDynamically { public static void main(String args[]) { Scanner sc = new Scanner(System.in); System.out.println("Enter the size of the array :: "); int size = sc.nextInt(); String myArray[] = new String[size]; System.out.println("Enter elements of the array (Strings) :: "); for(int i=0; i
To declare array size dynamically read the required integer value from the user using Scanner class and create an array using the given value:Exampleimport java.util.Arrays; import java.util.Scanner; public class PopulatingAnArray { public static void main(String args[]) { System.out.println("Enter the required size of the array :: "); Scanner s = new Scanner(System.in); int size = s.nextInt(); int myArray[] = new int [size]; System.out.println("Enter the elements of the array one by one "); for(int i = 0; i
To avoid hard coding you can read the size of the array from the user using command line arguments of the reader classes like Scanner. Then using this value create an array:Exampleimport java.util.Arrays; import java.util.Scanner; public class PopulatingAnArray { public static void main(String args[]) { System.out.println("Enter the required size of the array :: "); Scanner s = new Scanner(System.in); int size = s.nextInt(); int myArray[] = new int [size]; System.out.println("Enter the elements of the array one by one "); for(int i=0; i
To read data from user create a scanner class. Read the size of the array to be created from the user using nextInt() method. Create an array with the specified size. In the loop read the values from the user and store in the array created above.Exampleimport java.util.Arrays; import java.util.Scanner; public class PopulatingAnArray { public static void main(String args[]) { System.out.println("Enter the required size of the array :: "); Scanner s = new Scanner(System.in); int size = s.nextInt(); int myArray[] = new int [size]; ... Read More
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]