Simply, the difference is that Object is a single object whereas Object[] is an array (multiple or collection) of indexed objects. For example you could have an object that contains a string like Object obj = “Hello”; or you could have an array of strings like Object[] objArray = new Object[2]; objArray[0] = “Hello,”; objArray[1] … Read more
In Java you only have primitive or references to objects.* int[] arr = { 1, 2 }; int i = arr[0]; assert arr instanceof Object; // true arr is a reference to an array which has int as a element. how it was achieved? int[] has it’s own class int[].class and your arr is an … Read more
public int h = 44; public int getH() { System.out.println(“Beta “+h); // print line 1 return h; } public static void main(String[] args) { Baap b = new Beta(); System.out.println(b.h+” “+b.getH()); // print line 2 Beta bb = (Beta) b; System.out.println(bb.h+” “+bb.getH()); // print line 3 } In your first print statement in your main … Read more
You can’t do this in Java alone. Period. You may try JNI, but definitely not in Java alone. 1 solved Setting action listener on system applications
Thanks @HadiJ for answer Map<String,Integer> result = Arrays.stream(str) .reduce(new HashMap<>(), (hashMap, e) -> { hashMap.merge(e, 1, Integer::sum); return hashMap; }, (m, m2) -> { m.putAll(m2); return m; } ); solved Java stream reduce to map
As you seem to have strings that need to be (optionally) padded with zeros, you can use a different approach than generally used to pad integers: public String addPadding(int length, String text) { StringBuilder sb = new StringBuilder(); // First, add (length – ‘length of text’) number of ‘0’ for (int i = length – … Read more
what does each dictionary mean technically? The first Dictionary indicates that the type of the variable is Dictionary. Since you’re creating a new dictionary, you call the Dictionary class’ constructor i.e. Dictionary(). You can think of the new keyword as a word that you need to write in order to call any constructor. That said, … Read more
Lets see: The first five letters or numbers are included in the minimum charge; there is a $4 charge for each additional character. In pseudo-code: if sign-length <= 5: charge stays the same else: charge = charge + (sign-length – 5) * rate-per-character Should get you going … solved How to formulate this logic using … Read more
Here is a very naive way without regex. public class NotElegant { public static void main(String[] args){ String text = “doctors found many cancer related chest problems in japan during second world war.”; String term = “cancer problems”; System.out.println(getWordsNearEachOther(text,term,3)); } public static String getWordsNearEachOther(String text, String term, int distance){ String word1= term.split(” “)[0]; String word2= … Read more
Here’s a text (comment) illustrated explanation (both the question and the answer): public Object[] methodA() { // We are method A // In which we create an array Object[] someArrayCreatedInMethodA = new Object[10]; // And we can returned someArrayCreatedInMethodA return someArrayCreatedInMethodA; } public void methodB() { // Here we are inside another method B // … Read more
You want to transfer a String into a Treecreat? You should give Treecreat a constructor like this. public Treecreat(String yourString){ this.myString = yourString; } So the String is in Treecreat and you can work with it in your method, with call the method in this way: add(new Treecreat(data). solved How can we convert a string … Read more
Your code didn’t compile for me unless I changed the YYYY to yyyy. After that it seems to work fine. 0 solved Calendar add method error when going beyond the year
Finally it got solved. take a look. public class Solution { static int mod = 1000000007; static int summingSeries(long n) { return (int)(((n % mod) * (n % mod)) % mod); } private static final Scanner scanner = new Scanner(System.in); public static void main(String[] args) throws IOException { BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv(“OUTPUT_PATH”))); int … Read more
for (int i = 0; i < str.length(); i++) { if (str.charAt(i) == ‘ ‘ || str.charAt(i) == ‘\t’ || str.charAt(i) == ‘\n’) { // end of token, check if key word String currentWord = s.toString(); boolean isKeyword = false for (int j = 0; j < keywords.length; j++) { if (currentWord.equalsIgnoreCase(keywords[j])) { isKeyword = … Read more
To convert (actually, package) .class files into .jar files, you use the Jar tool. You can then generate a .exe file from the .jar using tools like Launch4j, JSmooth or several other packages (search the web for “jar exe”). solved How to convert java or class file to exe file [duplicate]