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
Object Oriented Programming Articles
Page 301 of 589
How to compare two ArrayList for equality in Java?
You can compare two array lists using the equals() method of the ArrayList class, this method accepts a list object as a parameter, compares it with the current object, in case of the match it returns true and if not it returns false.Exampleimport java.util.ArrayList; public class ComparingList { public static void main(String[] args) { ArrayList list1 = new ArrayList(); list1.add("JavaFx"); list1.add("Java"); list1.add("WebGL"); list1.add("OpenCV"); ArrayList list2 = new ArrayList(); list2.add("JavaFx"); list2.add("Java"); list2.add("WebGL"); list2.add("OpenCV"); System.out.println(list2); System.out.println(list1.equals(list2)); } }
Read MoreHow to convert a list collection into a dictionary in Java?
Following is an example to convert a list collection into a dictionary in Java.Exampleimport java.util.ArrayList; import java.util.Dictionary; import java.util.Hashtable; public class CollectionDictionary { public static void main(String[] args) { ArrayList list = new ArrayList(); list.add("JavaFx"); list.add("Java"); list.add("WebGL"); list.add("OpenCV"); System.out.println(list); Dictionary dictionary = new Hashtable(); Hashtable hashTable = new Hashtable(); hashTable.put(1, list.get(0)); hashTable.put(2, list.get(1)); hashTable.put(3, list.get(2)); hashTable.put(4, list.get(3)); System.out.println(hashTable); } }Output[JavaFx, Java, WebGL, OpenCV] {4=OpenCV, 3=WebGL, 2=Java, 1=JavaFx}
Read MoreFibonacci series program in Java without using recursion.
Following is the required program.Examplepublic class Tester { public static void main(String args[]) { int n1 = 0, n2 = 1, n3, i, max = 5; System.out.print(n1 + " " + n2); for (i = 2; i < max; ++i) { n3 = n1 + n2; System.out.print(" " + n3); n1 = n2; n2 = n3; } } }Output0 1 1 2 3
Read MorePrime number program in Java.
Following is the required program.Examplepublic class Tester { public static void main(String args[]) { int i, m = 0, flag = 0; int n = 41;// it is the number to be checked m = n / 2; if (n == 0 || n == 1) { System.out.println(n + " not a prime number"); } else { for (i = 2; i
Read MoreFactorial program in Java without using recursion.
Following is the required program.Examplepublic class Tester { static int factorial(int n) { if (n == 0) return 1; else return (n * factorial(n - 1)); } public static void main(String args[]) { int i, fact = 1; int number = 5; fact = factorial(number); System.out.println(number + "! = " + fact); } }Output5! = 120
Read MoreHow to match a line not containing a word in Java Regex
Exampleimport java.util.regex.Matcher; import java.util.regex.Pattern; public class NoRegTest { public static void main(String[] args) { String s="^fun"; Pattern pattern = Pattern.compile(s); Matcher matcher = pattern.matcher("Java is fun"); if(!matcher.find()) { System.out.println("not found"); } } }Outputnot found
Read MoreHow to Initialize and Compare Strings in Java?
You can compare Strings using compareTo() method or, equals() method or, or == operator. Following example demonstrates how to initialize and compare strings in Java. Example public class StringDemo { public static void main(String[] args) { String str1 = "tutorials"; String str2 = "point"; // comparing str1 and str2 int retval = str1.compareTo(str2); // prints the return value of the comparison if (retval < 0) { System.out.println("str1 is greater than str2"); } else if (retval == 0) { System.out.println("str1 is equal to str2"); } else { System.out.println("str1 is less than str2"); } } } Output str1 is less than str2
Read MoreHow to convert a Java String to an Int?
The parseXxx() method is used to get the primitive data type of a certain String. In this case to convert a String to integer you could use the parseInt() method.Examplepublic class Test { public static void main(String args[]) { int x =Integer.parseInt("9"); double c = Double.parseDouble("5"); int b = Integer.parseInt("444",16); System.out.println(x); System.out.println(c); System.out.println(b); } }Output9 5.0 1092
Read MoreWrite a Java program to capitalize each word in the string?
You can capitalize words in a string using the toUpperCase() method of the String class. This method converts the contents of the current string to Upper case letters.Examplepublic class StringToUpperCaseEmp { public static void main(String[] args) { String str = "string abc touppercase "; String strUpper = str.toUpperCase(); System.out.println("Original String: " + str); System.out.println("String changed to upper case: " + strUpper); } }OutputOriginal String: string abc touppercase String changed to upper case: STRING ABC TOUPPERCASE
Read MoreJava Program to check whether one String is a rotation of another.
To find weather a string is rotation of another, concat the first string to itself twice and find weatherExamplepublic class Sample { public static void main(String args[]){ String str1 = "gala"; String str2 = "alag"; String s3 = str1+str1; if(s3.contains(str2)) { System.out.println("str1 is rotation of str2"); } else { System.out.println("str1 is not rotation of str2"); } } }
Read More