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Object Oriented Programming Articles
Page 201 of 589
Data Conversion Using valueOf() In Java.
Java String class provides several variants of valueOf() method. These accept various data types and convert them into String.Examplepublic class Sample { public static void main(String args[]){ int i = 200; float f = 12.0f; char c = 's'; char[] ch = {'h', 'e', 'l', 'l', 'o'}; String data = String.valueOf(i); System.out.println(String.valueOf(i)); System.out.println(String.valueOf(f)); System.out.println(String.valueOf(c)); System.out.println(String.valueOf(ch)); } }Output200 12.0 s hello
Read MoreHow to Convert Double to String to Double in Java?
Java lang package provides a Double class which has methods to convert Double to String and vice versa. You can convert a String to a double using the parseDouble() method and double to String using the toString() methodExamplepublic class StringDouble { public static void main(String args[]){ Double data1 = 2.2; String str = Double.toString(data1); System.out.println(str); Double data2 = Double.parseDouble(str); System.out.println(data2); } }Output2.2 2.2
Read MoreWhat are C++ Floating-Point Constants?
Floating-point constants specify values that must have a fractional part.Floating-point constants have a "mantissa, " which specifies the value of the number, an "exponent, " which specifies the magnitude of the number, and an optional suffix that specifies the constant's type(double or float).The mantissa is specified as a sequence of digits followed by a period, followed by an optional sequence of digits representing the fractional part of the number. For example −24.25 12.00These values can also contain exponents. For example, 24.25e3 which is equivalent to 24250In C++ you can use the following code to create a floating point constant −Example#include ...
Read MoreHow to write Java program to add two matrices
To add two matrices −Create an empty matrixAt each position in the new matrix, assign the sum of the values in the same position from the given two matrices i.e. if A[i][j] and B[i][j] are the two given matrices then, the value of c[i][j] should be A[i][j] + B[i][j]Examplepublic class AddingTwoMatrices{ public static void main(String args[]){ int a[][]={{1,2,3},{4,5,6},{7,8,9}}; int b[][]={{1,1,1},{1,1,1},{1,1,1}}; int c[][]=new int[3][3]; for(int i = 0;i
Read MoreJava program to print the transpose of a matrix
The transpose of a matrix is the one whose rows are columns of the original matrix, i.e. if A and B are two matrices such that the rows of the matrix B are the columns of the matrix A then Matrix B is said to be the transpose of Matrix A.To print the transpose of the given matrix −Create an empty matrix.Copy the contents of the original matrix to the new matrix such that elements in the [j][i] position of the original matrix should be copied to the [i][j] position of the new matrix.Print the new matrix.Examplepublic class TransposeSample{ ...
Read MoreJava program to calculate mode in Java
In statistics math, a mode is a value that occurs the highest numbers of time. For Example, assume a set of values 3, 5, 2, 7, 3. The mode of this value set is 3 as it appears more than any other number.Algorithm1.Take an integer set A of n values. 2.Count the occurrence of each integer value in A. 3.Display the value with the highest occurrence.Examplepublic class Mode { static int mode(int a[], int n) { int maxValue = 0, maxCount = 0, i, j; for (i = 0; i < n; ...
Read MoreJava program to calculate the average of numbers in Java
An average of a set of numbers is their sum divided by their quantity. It can be defined as −average = sum of all values / number of valuesHere we shall learn how to programmatically calculate average.Algorithm1. Collect integer values in an array A of size N. 2. Add all values of A. 3. Divide the output of Step 2 with N. 4. Display the output of Step 3 as average.Examplepublic class AverageOfNNumbers { public static void main(String args[]){ int i,total; int a[] = {0,6,9,2,7}; int n = 5; total = 0; for(i=0; i
Read MoreJava Program to Check if a String is Numeric
ExampleYou can check if a given string is Numeric as shown in the following program.import java.util.Scanner; public class StringNumeric { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter a string ::"); String str = sc.next(); boolean number = str.matches("-?\d+(\.\d+)?"); if(number) { System.out.println("Given string is a number"); } else { System.out.println("Given string is not a number"); } } }OutputEnter a string :: 4245 Given string is a number
Read MoreJava Program to Convert a Stack Trace to a String
The Java.io.StringWriter class is a character stream that collects its output in a string buffer, which can then be used to construct a string. Closing a StringWriter has no effect.The Java.io.PrintWriter class prints formatted representations of objects to a text-output stream.Using these two classes you can convert a Stack Trace to a String.Exampleimport java.io.PrintWriter; import java.io.StringWriter; public class StackTraceToString { public static void main(String args[]) { try { int a[] = new int[2]; System.out.println("Access element three :" + a[3]); } catch (ArrayIndexOutOfBoundsException e) { ...
Read MoreConstructor overloading in Java
Yes! Java supports constructor overloading. In constructor loading, we create multiple constructors with the same name but with different parameters types or with different no of parameters.Examplepublic class Tester { private String message; public Tester(){ message = "Hello World!"; } public Tester(String message){ this.message = message; } public String getMessage(){ return message ; } public void setMessage(String message){ this.message = message; } public static void main(String[] args) { Tester tester = new Tester(); System.out.println(tester.getMessage()); Tester tester1 = new Tester("Welcome"); System.out.println(tester1.getMessage()); } } OutputHello World! Welcome
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