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Programming Articles
Page 1559 of 2547
Compare two Strings lexicographically in Java programming
We can compare two strings lexicographically using following ways in Java.Using String.compareTo(String) method. It compares in case sensitive manner.Using String.compareToIgnoreCase(String) method. It compares in case insensitive manner.Using String.compareTo(Object) method. It compares in case sensitive manner.These methods returns the ascii difference of first odd characters of compared strings.Examplepublic class Tester { public static void main(String args[]) { String str = "Hello World"; String anotherString = "hello world"; Object objStr = str; System.out.println( str.compareTo(anotherString) ); System.out.println( str.compareToIgnoreCase(anotherString) ); System.out.println( str.compareTo(objStr.toString())); } }Output-32 0 0
Read MoreGet the intersection of two sets in Java
To get the intersection of two sets, use the retainAll() method. Here are out two set −First set −HashSet set1 = new HashSet (); set1.add("Mat"); set1.add("Sat"); set1.add("Cat");Second set −HashSet set2 = new HashSet (); set2.add("Mat"); set2.add("Cat"); set2.add("Fat"); set2.add("Hat");Get the intersection −set1.retainAll(set2);The following is an example to get the intersection of two sets −Exampleimport java.util.*; public class Demo { public static void main(String args[]) { HashSet set1 = new HashSet (); HashSet set2 = new HashSet (); set1.add("Mat"); set1.add("Sat"); set1.add("Cat"); ...
Read MoreDisplay default initial values of DataTypes in Java
To display default initial values of a datatype, you need to just declare a variable of the same datatype and display it.The following is a Java program to display initial values of DataTypes.Examplepublic class Demo { boolean t; byte b; short s; int i; long l; float f; double d; void Display() { System.out.println("boolean (Initial Value) = " + t); System.out.println("byte (Initial Value) = " + b); System.out.println("short (Initial Value) = " + s); System.out.println("int (Initial Value) = " + ...
Read MoreJava program to check if binary representations of two numbers are anagram
The binary representations of two numbers are anagrams if they have the same number of 0’a and 1’s. An example of this is given as follows −Number 1 = 3 Binary representation of Number 1 = 0011 Number 2 = 12 Binary representation of Number 2 = 1100The two numbers are anagram.A program that demonstrates this is given as follows −Examplepublic class Example { public static void main (String[] args) { long x = 12, y = 3; if(Long.bitCount(x) == Long.bitCount(y)) ...
Read MoreConvert an ArrayList to an Array with zero length Array in Java
An ArrayList can be converted into an Array using the java.util.ArrayList.toArray() method. This method takes a single parameter i.e. the array of the required type into which the ArrayList elements are stored and it returns an Array that contains all the elements of the ArrayList in the correct order.A program that demonstrates this is given as follows −Exampleimport java.util.ArrayList; import java.util.List; public class Demo { public static void main(String[] args) { List aList = new ArrayList(); aList.add("James"); aList.add("Harry"); aList.add("Susan"); aList.add("Emma"); aList.add("Peter"); ...
Read MoreCount the Number of matching characters in a pair of Java string
In order to find the count of matching characters in two Java strings the approach is to first create character arrays of both the strings which make comparison simple.After this put each unique character into a Hash map.Compare each character of other string with created hash map whether it is present or not in case if present than put that character into other hash map this is to prevent duplicates.In last get the size of this new created target hash map which is equal to the count of number of matching characters in two given strings.Exampleimport java.util.HashMap; public class MatchingCharacters ...
Read MoreBoolean Literals in Java
The Boolean literals have two values i.e. True and False.The following is an example to display Boolean Literals.Examplepublic class Demo { public static void main(String[] args) { System.out.println("Boolean Literals"); boolean one = true; System.out.println(one); one = false; System.out.println(one); } }OutputBoolean Literals true falseIn the above program, we have declared a boolean value and assigned the boolean literal “true”.boolean one = true;In the same way, we have added another boolean literal “false”.one = false;Both of the above values are displayed, which are the boolean literals.
Read MoreGet current time information in Java
Import the following package for to work with Calendar class in Java, import java.util.Calendar;Create a calendar class now.Calendar cal = Calendar.getInstance();To display entire time information, use the following fields.cal.get(Calendar.HOUR_OF_DAY) cal.get(Calendar.HOUR) cal.get(Calendar.MINUTE) cal.get(Calendar.SECOND) cal.get(Calendar.MILLISECOND)The following is the final example.Exampleimport java.util.Calendar; public class Demo { public static void main(String[] args) { Calendar cal = Calendar.getInstance(); // current date and time System.out.println(cal.getTime().toString()); // time information System.out.println("Hour (24 hour format) : " + cal.get(Calendar.HOUR_OF_DAY)); System.out.println("Hour (12 hour format) : " + cal.get(Calendar.HOUR)); ...
Read MoreValidate city and state with Java Regular Expressions
In order to match the city and state using regular expression, we use the matches method in Java. The java.lang.String.matches() method returns a boolean value which depends on the matching of the String with the regular expression.Declaration − The java.lang.String.matches() method is declared as follows −Examplepublic class Example { public static void main( String[] args ) { System.out.println(city("Mumbai")); System.out.println(state("Goa")); } // validating the city public static boolean city( String c ) { return c.matches( "([a - zA - Z] + |[a - zA - Z] + \s[a ...
Read MoreValidate the ZIP code with Java Regular expressions
In order to match the ZIP code using regular expression, we use the matches method in Java. The java.lang.String.matches() method returns a boolean value which depends on the matching of the String with the regular expression.Declaration − The java.lang.String.matches() method is declared as follows −public boolean matches(String regex)Let us see a program which validates the ZIP code with Java Regular Expressions −Examplepublic class Example { public static void main( String[] args ) { System.out.println(zipIndia("400709")); System.out.println(zipUS("10060")); } // validate zip public static boolean zipIndia( String z ) { ...
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