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Programming Articles
Page 1099 of 2547
How to extract the last n characters from a string using Java?
To extract last n characters, simply print (length-n)th character to nth character using the charAt() method.Examplepublic class ExtractingCharactersFromStrings { public static void main(String args[]) { String str = "Hi welcome to tutorialspoint"; int n = 5; int initial = str.length()-5; for(int i=initial; i
Read MoreHow to create a string from a Java Array?
You can convert an array of Strings to a single array using the collect() method.Exampleimport java.util.Arrays; import java.util.stream.Collectors; public class CreatngStringFromArray { public static void main(String args[]) { String [] myArray = {"Welcome", "to", "Tutorialspoint"}; String str = Arrays.stream(myArray).collect(Collectors.joining(" ")); System.out.println(str); } }OutputWelcome to Tutorialspoint
Read MoreHow to capture divide by zero exception in Java?
When you divide a number by zero an Arithmetic Exception number is thrown.Examplepublic class DividedByZero { public static void main(String args[]) { int a, b; try { a = 0; b = 54/a; System.out.println("hello"); } catch (ArithmeticException e) { System.out.println("you cannot divide a number with zero"); } } }Outputyou cannot divide a number with zero
Read MoreWhat is the difference between System.out.println() and System.out.print() in Java?
The println() terminates the current line by writing the line separator string. The print() method just prints the given content.Examplepublic class Sample { public static void main(String args[]) { System.out.println("Hello"); System.out.println("how are you"); System.out.print("Hello"); System.out.print("how are you"); } }OutputHello how are you Hellohow are you
Read MoreHow to perform sort using Java?
You can sort an array using sort() method of the Arrays class.Exampleimport java.util.Arrays; public class MainClass { public static void main(String args[]) throws Exception { int array[] = { 2, 5, -2, 6, -3, 8, 0, -7, -9, 4 }; Arrays.sort(array); printArray("Sorted array", array); int index = Arrays.binarySearch(array, 1); System.out.println("Didn't find 1 @ " + index); int newIndex = -index - 1; array = insertElement(array, 1, newIndex); printArray("With 1 added", array); } ...
Read MoreHow to open a plain text file in Java?
You can access a plain text using the File class.Exampleimport java.io.File; public class ReadFile { public static void main(String[] args) { File f = null; String str = "data.txt"; try { f = new File(str); boolean bool = f.canExecute(); String a = f.getAbsolutePath(); System.out.print(a); System.out.println(" is executable: "+ bool); } catch (Exception e) { e.printStackTrace(); } } }Output C:\Users\data is executable: true
Read MoreHow to use labels in Java code?
Java provides two types of branching/control statements namely, break and continue.The break statementThis statement terminates the loop or switch statement and transfers execution to the statement immediately following the loop or switch.ExampleFollowing is the example of the break statement. Here we are trying to print elements up to 10 and, using break statement we are terminating the loop when the value in the loop reaches 8.public class BreakExample { public static void main(String args[]){ for(int i=0; i
Read MoreHow to move an element of an array to a specific position (swap)?
To move an element from one position to other (swap) you need to –Create a temp variable and assign the value of the original position to it.Now, assign the value in the new position to original position.Finally, assign the value in the temp to the new position.Exampleimport java.util.Arrays; public class ChangingPositions { public static void main(String args[]) { int originalPosition = 1; int newPosition = 1; int [] myArray = {23, 93, 56, 92, 39}; int temp = myArray[originalPosition]; myArray[originalPosition] = myArray[newPosition]; myArray[newPosition] = temp; System.out.println(Arrays.toString(myArray)); } }Output[23, 39, 56, 92, 93]
Read MoreHow to Convert a Java 8 Stream to an Array?
To convert a stream to an Array in Java -Collect the stream to a list using the Collect interface and the Collectors class.Now convert the list to an array using the toArray() method.Exampleimport java.util.Arrays; import java.util.List; import java.util.stream.Collectors; import java.util.stream.Stream; public class J8StreamToArray { public static void main(String args[]) { String[] myArray = { "JavaFX", "OpenCV", "WebGL", "HBase" }; Stream stream = Stream.of(myArray); List list = stream.collect(Collectors.toList()); String[] str = list.toArray(new String[0]); System.out.println(Arrays.toString(str)); } }Output[JavaFX, OpenCV, WebGL, HBase]
Read MoreHow to convert an Array to a Set in Java?
One solution to add an array to set is to use the addAll() method of the Collections class. This method accepts a collection and an element and, it adds the given element to the specified Collection. Example Live Demo import java.util.Collections; import java.util.HashSet; import java.util.Set; public class ArrayToSet { public static void main(String args[]) { Integer[] myArray = {23, 93, 56, 92, 39}; Set set = new HashSet(); Collections.addAll(set, myArray); System.out.println(set); } } Output [23, 39, 56, 92, 93]
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