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Programming Articles
Page 1564 of 2547
Java program to check if binary representation is palindrome
A palindrome is a sequence that is same both forwards and backwards. The binary representation of a number is checked for being a palindrome but no leading 0’s are considered. An example of this is given as follows − Number = 5 Binary representation = 101 The binary representation of 5 is a palindrome as it is the same both forwards and backwards. A program that demonstrates this is given as follows. Example public class Example { public static void main(String argc[]) { long num = 5, n1; ...
Read MoreHow to display Java Runtime Environment (JRE) version
Use the System.getProperty() method in Java to get the Java Runtime Environment.It’s syntax is −String getProperty(String key)Above, the key is the name of the system property. Since, we want the Java Runtime Environment name, therefore we will add the key as −java.versionThe following is an example −Examplepublic class Demo { public static void main(String[] args) { System.out.print("Java Specification Version: "); System.out.println(System.getProperty("java.specification.version")); System.out.print("java Runtime Environment (JRE) version: "); System.out.println(System.getProperty("java.version")); } }OutputJava Specification Version: 1.8 java Runtime Environment (JRE) version: 1.8.0_141
Read MoreFormat numerical data with printf in Java
First, we have taken a double variable and displayed it twice.double d = 399.8877; System.out.printf("d1 = %2$f d2 = %1$g", d, d);After that, we have formatted numerical int data −int val1 = 90, val2 = 35, val3 = 88, val4 = 600; System.out.printf("val1 = %d, val2 = %x, val3 = %o, val4 = %d", val1, val2, val3, val4); System.out.printf("val2 = %4$d, val2 = %3$d, val3 = %2$o, val4 = %1$d", val1, val2, val3, val4);Above, we have displayed %o for octal, %x for hexadecimal, %d for integer, etc.The following is the complete example −Examplepublic class Demo { public static void ...
Read MoreRoll a six-sided die 6000 times in Java
In order to roll a six sided die 6000 times in Java, we need to the nextInt() statement with decision making statements.The nextInt() method 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 roll a six sided die 6000 times −Exampleimport java.util.Random; public class Example { public static void main(String args[]) { Random rd = new Random(); // random number generator int freq[] = new int[6]; // creating an array to compute frequency of ...
Read MoreGet all digits from a string in Java
Let’s say the following is our string.String str = "DEMO98 TE4567XT";To display only the digits from the above string, we have used the replaceAll() method and replace all the characters with empty.str.replaceAll("\D", ""))The following is the final example that displays only digits from the string.Examplepublic class Demo { public static void main(String[] args) { String str = "DEMO98 TE4567XT"; System.out.println("String = "+str); System.out.println("Displaying digits: "+str.replaceAll("\D", "")); } }OutputString = DEMO98 TE4567XT Displaying digits: 984567
Read MoreConvert a Queue to a List in Java
In order to convert a Queue to a List in Java, we can create an LinkedList and pass the Queue as an argument in the parameterized constructor of an ArrayList. This can be done as follows −Queue q = new LinkedList(); List l = new ArrayList(q);The quickest way is used to LinkedList in the first place which can be used both as a List and a Queue. This can be done as follows −Queue q = new LinkedList(); List l = (List) q;Let us see a program to convert a queue to a list −Exampleimport java.util.LinkedList; import java.util.List; import java.util.Queue; ...
Read MoreC++ Program to Multiply Two Matrix Using Multi-dimensional Arrays
A matrix is a rectangular array of numbers that is arranged in the form of rows and columns.An example of a matrix is as follows.A 3*3 matrix has 3 rows and 3 columns as shown below −8 6 3 7 1 9 5 1 9A program that multiplies two matrices using multidimensional arrays is as follows.Example#include using namespace std; int main() { int product[10][10], r1=2, c1=3, r2=3, c2=3, i, j, k; int a[2][3] = { {2, 4, 1} , {2, 3, 9} }; int b[3][3] = { {1, 2, 3} , {3, 6, 1} , {2, 9, 7} }; if (c1 != r2) { cout
Read MoreParse string date value input in Java
UseSimpleDateFormat('dd-MMM-yy') for string date.Format dateFormatter = new SimpleDateFormat("dd-MMM-yy");For above class, do not forget to import the following package, else an error would be visible.import java.text.SimpleDateFormat;Now, parse the date.Date dt = (Date) dateFormatter.parseObject("20-Nov-18");Exampleimport java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; public class Main { public static void main(String[] argv) throws Exception { Format dateFormatter = new SimpleDateFormat("dd-MMM-yy"); // parse Date dt = (Date) dateFormatter.parseObject("20-Nov-18"); System.out.println("Date = "+dt); } }OutputDate = Tue Nov 20 00:00:00 UTC 2018
Read MoreDisplay path separator in Java
To display the path separator, use the Properties class and import the following package −import java.util.Properties;Use the getProperties() method first and create an object −Properties p = System.getProperties();Now, set the key for path separator −p.getProperty("path.separator")The following is an example −Exampleimport java.util.Properties; public class Demo { public static void main(String[] args) { Properties p = System.getProperties(); System.out.println("Separator is "+p.getProperty("path.separator")); } }OutputSeparator is :
Read MoreSet width and precision to format output in Java
Set width in output as shown below. Here, %10 sets a 10 character fieldSystem.out.printf("d1 = %10.2f d2 = %8g", d1, d2);Above, the value after the decimal is for decimal places i.e. 5.3 is for 3 decimal places −System.out.printf("d1 = %5.3f d2 = %2.5f", d1, d2);The following is an example −Examplepublic class Demo { public static void main(String[] args) throws Exception { double d1 = 399.8877; double d2 = 298.87690; System.out.printf("d1 = %10.2f d2 = %8g", d1, d2); System.out.printf("d1 = %5.3f d2 = %2.5f", d1, d2); } }Outputd1 = 399.89 d2 = 298.877 d1 = 399.888 d2 = 298.87690
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