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Java Articles
Page 16 of 450
Convert one base to other bases in a single Java Program
Let’s say we have an Octal number. To convert Octal to other bases like binary, hexadecimal, etc, the Java code is as follows −Examplepublic class Demo{ public static String base_convert(String num, int source, int destination){ return Integer.toString(Integer.parseInt(num, source), destination); } public static void main(String[] args){ String my_num = "345"; int source = 8; int destination = 2; System.out.println("Converting the number from octal to binary: "+ base_convert (my_num, source, destination)); destination = 10; System.out.println("Converting the number from ...
Read MoreJava program to generate random numbers within a given range and store in a list
To generate random numbers in a given range, the Java code is as follows −Exampleimport java.util.Random; import java.util.*; public class Demo{ public static void main(String args[]){ Random my_rand = new Random(); List my_list_1 = new ArrayList(); int v_1 = my_rand.nextInt(1000); int v_2 = my_rand.nextInt(967); int v_3 = my_rand.nextInt(1050); int v_4 = my_rand.nextInt(10000); int v_5 = my_rand.nextInt(100); my_list_1.add(v_1); my_list_1.add(v_2); my_list_1.add(v_3); my_list_1.add(v_4); my_list_1.add(v_5); System.out.println("The random values in the list are : "); for(int i=0; i
Read MoreJava program to split the Even and Odd elements into two different lists
To split the Even and Odd elements into two different lists, the Java code is as follows −Exampleimport java.util.Scanner; public class Demo{ public static void main(String[] args){ int n, j = 0, k = 0; Scanner s = new Scanner(System.in); System.out.println("Enter the number of elements required :"); n = s.nextInt(); int my_arr[] = new int[n]; int odd_vals[] = new int[n]; int even_vals[] = new int[n]; System.out.println("Enter the elements of the array(even and add numbers) :"); ...
Read MoreProgram to Iterate over a Stream with Indices in Java 8
To iterate over a Stream with Indices in Java 8, the code is as follows −Exampleimport java.util.stream.IntStream; import java.util.*; import java.util.concurrent.atomic.AtomicInteger; public class Demo{ public static void main(String[] args){ String[] my_array = { "T", "h", "i", "s", "s", "a", "m", "p", "l", "e" }; AtomicInteger my_index = new AtomicInteger(); System.out.println("The elements in the string array are :"); Arrays.stream(my_array).map(str -> my_index.getAndIncrement() + " -> " + str).forEach(System.out::println); } }OutputThe elements in the string array are : 0 -> T 1 -> h 2 -> i 3 -> ...
Read MoreJava program to find Maximum and minimum element’s position in a list
To find the maximum and minimum element’s position in a list, the Java program is as follows −Exampleimport java.util.*; import java.util.Arrays; import java.util.Collections; public class Demo{ public static int index_val(int my_arr[], int t){ if (my_arr == null){ return -1; } int len = my_arr.length; int i = 0; while (i < len){ if (my_arr[i] == t){ return i; } else { ...
Read MoreFind the uncommon values concatenated from both the strings in Java
To find the uncommon values concatenated from both the strings in Java, the code is as follows −Exampleimport java.util.*; import java.lang.*; import java.io.*; public class Demo{ public static String concat_str(String str_1, String str_2){ String result = ""; int i; HashMap my_map = new HashMap(); for (i = 0; i < str_2.length(); i++) my_map.put(str_2.charAt(i), 1); for (i = 0; i < str_1.length(); i++) if (!my_map.containsKey(str_1.charAt(i))) result += str_1.charAt(i); else my_map.put(str_1.charAt(i), ...
Read MoreFind 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 ...
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