String s = "" + (char) a + (char) b + (char) c;
String s = "" + a + b + c;
直接这样他也是7210565281不是自动转换格式么
如果用+连接字符串和其他数据类型,会将其他数据类型先自动转型为字符串,再连接:
+
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String s = "" + (char) a + (char) b + (char) c;