Java program prints all unique words in a string

To find unique words in a string, use Java's Map utility because its properties are that it does not contain duplicate keys. To find unique words, first get all the words in the array for comparison. Space/second. If there are other characters, such as commas (,) or periods (.), these characters in the string should be replaced first using the required regular expression.

Insert each word in the string as the key of the Map, and provide the initial value corresponding to each key, which is 'Unique', if this word has not been inserted into the Map before. Repeat this process until all words in the string have been inserted and checked.

Example

import　java.util.LinkedHashMap;
import　java.util.Map;
public　class　Tester　{
　　　public　static　void　main(String[]　args)　{
　　　　　　String　str　=　"Guitar is instrument and Piano is instrument";
　　　　　　String[]　strArray　=　str.split("\\s+");
　　　　　　Map<String,　String>　hMap　=　new　LinkedHashMap<String,　String>();
　　　　　　for(int　i　=　0;　i　<　strArray.length　;　i++　)　{
　　　　　　　　　if(!hMap.containsKey(strArray[i]))　{
　　　　　　　　　　　　hMap.put(strArray[i],"Unique");
　　　　　　　　　}
　　　　　　}
　　　　　　System.out.println(hMap);
　　　}
}

Output Result

{Guitar=Unique, is=Unique, instrument=Unique, and=Unique, Piano=Unique}