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Java Articles
Page 121 of 450
Multiple inheritance by Interface in Java
An interface contains variables and methods like a class but the methods in an interface are abstract by default unlike a class. Multiple inheritance by interface occurs if a class implements multiple interfaces or also if an interface itself extends multiple interfaces.A program that demonstrates multiple inheritance by interface in Java is given as follows:Exampleinterface AnimalEat { void eat(); } interface AnimalTravel { void travel(); } class Animal implements AnimalEat, AnimalTravel { public void eat() { System.out.println("Animal is eating"); } public void travel() { System.out.println("Animal is travelling"); } ...
Read MoreJava program for Multiplication of Array elements
To find the product of elements of an array.create an empty variable. (product)Initialize it with 1.In a loop traverse through each element (or get each element from user) multiply each element to product.Print the product.Exampleimport java.util.Arrays; import java.util.Scanner; public class ProductOfArrayOfElements { 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]; int product = 1; System.out.println("Enter the elements of the array one by one "); for(int i=0; i
Read MoreSplit String with Comma (,) in Java
Let’s say the following is our string.String str = " This is demo text, and demo line!";To split a string with comma, use the split() method in Java.str.split("[,]", 0);The following is the complete example.Examplepublic class Demo { public static void main(String[] args) { String str = "This is demo text, and demo line!"; String[] res = str.split("[,]", 0); for(String myStr: res) { System.out.println(myStr); } } }OutputThis is demo text and demo line!
Read MoreConcatenate string to an int value in Java
To concatenate a string to an int value, use the concatenation operator.Here is our int.int val = 3;Now, to concatenate a string, you need to declare a string and use the + operator.String str = "Demo" + val;Let us now see another example.Exampleimport java.util.Random; public class Demo { public static void main( String args[] ) { int val = 3; String str = "" + val; System.out.println(str + " = Rank "); } }Output3 = Rank
Read MoreJava Program to convert ASCII code to String
To convert ASCII to string, use the toString() method. Using this method will return the associated character.Let’s say we have the following int value, which works as ASCII for us.int asciiVal = 89;Now, use the toString() method.String str = new Character((char) asciiVal).toString();Examplepublic class Demo { public static void main(String []args) { int asciiVal = 87; String str = new Character((char) asciiVal).toString(); System.out.println(str); } }OutputW
Read MoreGenerate a random array of integers in Java
In order to generate random array of integers in Java, we use the nextInt() method of the java.util.Random class. This returns the next random integer value from this random number generator sequence.Declaration − The java.util.Random.nextInt() method is declared as follows −public int nextInt()Let us see a program to generate a random array of integers in Java −Exampleimport java.util.Random; public class Example { public static void main(String[] args) { Random rd = new Random(); // creating Random object int[] arr = new int[5]; for (int i = 0; i
Read MorePrint a 2D Array or Matrix in Java
In this post we will try to print an array or matrix of numbers at console in same manner as we generally write on paper.For this the logic is to access each element of array one by one and make them print separated by a space and when row get to end in matrix then we will also change the row.Examplepublic class Print2DArray { public static void main(String[] args) { final int[][] matrix = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } }; for (int i = 0; i
Read MoreArray Copy in Java
Array in Java can be copied to another array using the following ways.Using variable assignment. This method has side effects as changes to the element of an array reflects on both the places. To prevent this side effect following are the better ways to copy the array elements.Create a new array of the same length and copy each element.Use the clone method of the array. Clone methods create a new array of the same size.Use System.arraycopy() method. The arraycopy() can be used to copy a subset of an array.ExampleCreate a java class named Tester.Tester.javapublic class Tester { public static ...
Read MoreHow to find Min/Max numbers in a java array?
You can find the minimum and maximum values of an array using for loops −Examplepublic class MinAndMax { public int max(int [] array) { int max = 0; for(int i=0; imax) { max = array[i]; } } return max; } public int min(int [] array) { int min = array[0]; for(int i=0; i
Read MoreHow to convert string to array of integers in java?
You can convert a String to integer using the parseInt() method of the Integer class. To convert a string array to an integer array, convert each element of it to integer and populate the integer array with them.Exampleimport java.util.Arrays; public class StringToIntegerArray { public static void main(String args[]) { String [] str = {"123", "345", "437", "894"}; int size = str.length; int [] arr = new int [size]; for(int i=0; i
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