Check If a Word Occurs As a Prefix of Any Word in a Sentence LeetCode solution in Java

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class Solution {
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  public int isPrefixOfWord(String sentence, String searchWord) {
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    if (!sentence.contains(searchWord)) return -1;
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    boolean y = false;
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    String[] str = sentence.split(" ");
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    for (int i = 0; i < str.length; i++) {
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      if (str[i].contains(searchWord)) {
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        for (int j = 0; j < searchWord.length(); j++) {
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          if (str[i].charAt(j) != searchWord.charAt(j)) {
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            y = true;
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            break;
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          }
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        }
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        if (!y) {
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          return i + 1;
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        }
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      }
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      y = false;
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    }
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    return -1;
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  }
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}