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Java Articles
Page 118 of 450
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 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 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 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 MoreSingle level inheritance in Java
Single Level inheritance - A class inherits properties from a single class. For example, Class B inherits Class A.Exampleclass Shape { public void display() { System.out.println("Inside display"); } } class Rectangle extends Shape { public void area() { System.out.println("Inside area"); } } public class Tester { public static void main(String[] arguments) { Rectangle rect = new Rectangle(); rect.display(); rect.area(); } }OutputInside display Inside areaHere Rectangle class inherits Shape class and can execute two methods, display() and area() as shown.
Read MoreSingle level inheritance in Java
Single Level inheritance - A class inherits properties from a single class. For example, Class B inherits Class A.Exampleclass Shape { public void display() { System.out.println("Inside display"); } } class Rectangle extends Shape { public void area() { System.out.println("Inside area"); } } public class Tester { public static void main(String[] arguments) { Rectangle rect = new Rectangle(); rect.display(); rect.area(); } }OutputInside display Inside areaHere Rectangle class inherits Shape class and can execute two methods, display() and area() as shown.
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