How do you count unique words in a string in Java?

How do you count words in a string in Java?

int count = 1;

  1. for (int i = 0; i < str. length() – 1; i++) {
  2. if ((str. charAt(i) == ‘ ‘) && (str. charAt(i + 1) != ‘ ‘)) {
  3. count++; }
  4. } System. out. println(“Number of words in a string : ” + count);
  5. } }

How do you count unique values in Java?

Java Program to Find the Number of Unique Words

  1. //Java Program to Find the Number of Unique Words.
  2. import java.io.BufferedReader;
  3. import java.io.IOException;
  4. import java.io.InputStreamReader;
  5. public class NumberOfUniqueWords {
  6. // Function to calculate the number of unique words.

How do I count a specific word in Java?

Count occurrences of a word in string

  1. First, we split the string by spaces in a.
  2. Then, take a variable count = 0 and in every true condition we increment the count by 1.
  3. Now run a loop at 0 to length of string and check if our string is equal to the word.

What does \ s+ mean in Java?

Therefore, the regular expression s matches a single whitespace character, while s+ will match one or more whitespace characters.

How do you count words in a Hashmap?

Declare a Hashmap in Java of {char, int}. Traverse in the string, check if the Hashmap already contains the traversed character or not. If it is present, then increase its count using get() and put() function in Hashmap. Once the traversal is completed, traverse in the Hashmap and print the character and its frequency.

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How do you count unique values in a string?

Find Unique Words in String using List & Nested For Loop

  1. Start.
  2. Read input string.
  3. Split the string based on a delimiter. …
  4. Create an List with the array of words.
  5. For each word in the list, check if there is another word with the same value. …
  6. At the end of all iterations, you end up with list containing only unique words.

What is a unique word in Java?

To find unique words in a string use Map utility of java because of its property that it does not contain duplicate keys.In order to find unique words first get all words in array so that compare each word,for this split string on the basis of space/s. If other characters such as comma(,) or fullstop (.)

How do you find unique words in a list Python?

Using Python’s import numpy, the unique elements in the array are also obtained. In first step convert the list to x=numpy. array(list) and then use numpy. unique(x) function to get the unique values from the list.

Why are strings immutable in Java?

String is Immutable in Java because String objects are cached in String pool. Since cached String literals are shared between multiple clients there is always a risk, where one client’s action would affect all another client. You are right. String in java uses concept of String Pool literal.

Which function is used to search for text within a string?

Search for string inside another string – strstr

The function strstr returns the first occurrence of a string in another string. This means that strstr can be used to detect whether a string contains another string. In other words, whether a string is a substring of another string.

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