Java基础入门第7问 单个char型变量不一定能存储一个汉字

See java.lang Class Character A single char variable can store 16 bits representing the Basic Multilingual Plane, but only a few groups in this plane are CJK, such as Chinese characters and punctuation. In UTF-16 encoding, most Chinese characters require two 16-bit code units, or 32 bits, to represent.