我找到了。发条缪斯使我走上了道路。设置参数时，char类型不会转换为Object。以下将起作用：
try (PreparedStatement st = con.prepareStatement(query)) {
int n = 1;
for (Object o : params) {
if (o instanceof Character) {
o = "" + o;
}
st.setObject(n, o);
n++;
}
st.executeQuery();
}
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