Convert to Base -2 LeetCode solution in Java

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class Solution {
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  public String baseNeg2(int n) {
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    StringBuilder answer = new StringBuilder(n == 0 ? "0" : "");
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    for (; n != 0; n = -(n >> 1)) {
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      answer.append((n & 1) == 0 ? '0' : '1');
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    }
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    return answer.reverse().toString();
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  }
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}