Design a Text Editor LeetCode solution in Java

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class TextEditor {
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  StringBuilder res;
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  int pos = 0;
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  public TextEditor() {
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    res = new StringBuilder();
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  }
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  public void addText(String text) {
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    res.insert(pos, text);
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    pos += text.length();
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  }
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  public int deleteText(int k) {
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    int tmp = pos;
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    pos -= k;
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    if (pos < 0) pos = 0;
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    res.delete(pos, tmp);
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    return tmp - pos;
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  }
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  public String cursorLeft(int k) {
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    pos -= k;
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    if (pos < 0) pos = 0;
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    if (pos < 10) return res.substring(0, pos);
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    return res.substring(pos - 10, pos);
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  }
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  public String cursorRight(int k) {
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    pos += k;
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    if (pos > res.length()) pos = res.length();
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    if (pos < 10) return res.substring(0, pos);
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    return res.substring(pos - 10, pos);
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  }
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}