Create CircularSentence.java

Leetcode/CircularSentence.java

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+/**
+2490. Circular Sentence
+Solved
+Easy
+Topics
+Companies
+Hint
+A sentence is a list of words that are separated by a single space with no leading or trailing spaces.
+
+For example, "Hello World", "HELLO", "hello world hello world" are all sentences.
+Words consist of only uppercase and lowercase English letters. Uppercase and lowercase English letters are considered different.
+
+A sentence is circular if:
+
+The last character of a word is equal to the first character of the next word.
+The last character of the last word is equal to the first character of the first word.
+For example, "leetcode exercises sound delightful", "eetcode", "leetcode eats soul" are all circular sentences. However, "Leetcode is cool", "happy Leetcode", "Leetcode" and "I like Leetcode" are not circular sentences.
+
+Given a string sentence, return true if it is circular. Otherwise, return false.
+  **/
+class Solution {
+    public boolean isCircularSentence(String sentence) {
+        if(sentence == null ){
+            return false;
+        }
+        String[] a = sentence.split(" ");
+        if(a.length==1){
+            if(a[0].charAt(0)==a[0].charAt(a[0].length()-1)) return true;
+            return false;
+        }else{
+
+            if(a[0].charAt(0)==a[a.length-1].charAt(a[a.length-1].length()-1)){
+
+                for(int i=0;i<a.length-1;i++){
+                    if(a[i].charAt(a[i].length()-1)!=a[i+1].charAt(0)) return false;
+                }
+                return true;
+            }else{
+                return false;
+            }
+
+        }
+    }
+}