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Java Articles
Page 18 of 450
Find the first repeated word in a string in Java
To find the first repeated word in a string in Java, the code is as follows −Exampleimport java.util.*; public class Demo{ static char repeat_first(char my_str[]){ HashSet my_hash = new HashSet(); for (int i=0; i
Read MoreJava program to find IP Address of the client
To find the IP Address of the client, the Java code is as follows −Exampleimport java.net.*; import java.io.*; import java.util.*; import java.net.InetAddress; public class Demo{ public static void main(String args[]) throws Exception{ InetAddress my_localhost = InetAddress.getLocalHost(); System.out.println("The IP Address of client is : " + (my_localhost.getHostAddress()).trim()); String my_system_address = ""; try{ URL my_url = new URL("http://bot.whatismyipaddress.com"); BufferedReader my_br = new BufferedReader(new InputStreamReader(my_url.openStream())); my_system_address = my_br.readLine().trim(); } ...
Read MoreReplace null values with default value in Java Map
To replace null values with default value in Java Map, the code is as follows −Exampleimport java.util.*; import java.util.stream.*; public class Demo{ public static Map null_vals(Map my_map, T def_val){ my_map = my_map.entrySet().stream().map(entry -> { if (entry.getValue() == null) entry.setValue(def_val); return entry; }) .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); return my_map; } public static void main(String[] args){ Map my_map = new HashMap(); my_map.put(1, null); my_map.put(2, 56); ...
Read MoreReplacing ‘public’ with ‘private’ in “main” in Java
When ‘public’ is used in ‘main’ −Examplepublic class Demo{ public static void main(String args[]){ System.out.println("This is a sample only"); } }OutputThis is a sample onlyA class named Demo contains the main function that is public. It has a print function, which successfully compiles, executes and prints the message on the console.When ‘public’ is replaced with ‘private’Examplepublic class Demo{ private static void main(String args[]){ System.out.println("This is a sample only"); } }OutputError: Main method not found in class Demo, please define the main method as: public static void main(String[] args) or a ...
Read MoreJava Program to check if count of divisors is even or odd
To check if the count of divisors is even or odd, the Java code is as follows −Exampleimport java.io.*; import java.math.*; public class Demo{ static void divisor_count(int n_val){ int root_val = (int)(Math.sqrt(n_val)); if (root_val * root_val == n_val){ System.out.println("The number of divisors is an odd number"); }else{ System.out.println("The number of divisors is an even number"); } } public static void main(String args[]) throws IOException{ divisor_count(25); } }OutputThe number of divisors is an odd ...
Read MoreJava Program to check whether it is possible to make a divisible by 3 number using all digits in an array
To check whether it is possible to make a divisible by 3 number using all digits in an array, the Java code is as follows −Exampleimport java.io.*; import java.util.*; public class Demo{ public static boolean division_possible(int my_arr[], int n_val){ int rem = 0; for (int i = 0; i < n_val; i++) rem = (rem + my_arr[i]) % 3; return (rem == 0); } public static void main(String[] args){ int my_arr[] = { 66, 90, 87, 33, 123}; ...
Read MoreJava Program to Convert Iterator to Spliterator
To convert Iterator to Spliterator, the Java code is as follows −Exampleimport java.util.*; public class Demo{ public static Spliterator getspiliter(Iterator iterator){ return Spliterators.spliteratorUnknownSize(iterator, 0); } public static void main(String[] args){ Iterator my_iter = Arrays.asList(56, 78, 99, 32, 100, 234).iterator(); Spliterator my_spliter = getspiliter(my_iter); System.out.println("The values in the spliterator are : "); my_spliter.forEachRemaining(System.out::println); } }OutputThe values in the spliterator are : 56 78 99 32 100 234A class named Demo contains a function named ‘getspiliter’ that returns a spliterator. In the ...
Read MoreJava program to count the characters in each word in a given sentence
To count the characters in each word in a given sentence, the Java code is as follows −Exampleimport java.util.*; public class Demo{ static final int max_chars = 256; static void char_occurence(String my_str){ int count[] = new int[max_chars]; int str_len = my_str.length(); for (int i = 0; i < str_len; i++) count[my_str.charAt(i)]++; char ch[] = new char[my_str.length()]; for (int i = 0; i < str_len; i++){ ch[i] = my_str.charAt(i); int find = 0; for (int j = 0; j
Read MoreJava Program to Count trailing zeroes in factorial of a number
To count trailing zeroes in factorial of a number, the Java code is as follows −Exampleimport java.io.*; public class Demo{ static int trailing_zero(int num){ int count = 0; for (int i = 5; num / i >= 1; i *= 5){ count += num / i; } return count; } public static void main (String[] args){ int num = 1000000; System.out.println("The number of trailing zeroes in " + num +" factorial is " + ...
Read MoreJava program to expand a String if range is given?
To expand a String if range is given, the Java code is as follows −Examplepublic class Demo { public static void expand_range(String word) { StringBuilder my_sb = new StringBuilder(); String[] str_arr = word.split(", "); for (int i = 0; i < str_arr.length; i++){ String[] split_str = str_arr[i].split("-"); if (split_str.length == 2){ int low = Integer.parseInt(split_str[0]); int high = Integer.parseInt(split_str[split_str.length - 1]); while (low
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