❶ java a大于等于并且a小于等于
①a的值大于等于b并且小于等于c
②a的值大于等于b或a的值小于等于c
❷ java中的运算符都有哪些
有这些，可以看看下面的网址：
http://www.sojson.com/operation.html#java_
postfix expr++expr--
unary ++expr --expr +expr -expr ~ !
multiplicative * / %
additive + -
shift << >> >>>
relational < > <= >= instanceof
equality == !=
bitwise AND &
bitwise exclusive OR ^
bitwise inclusive OR |
logical AND &&
logical OR ||
ternary ? :
assignment = += -= *= /= %= &= ^= |= <<= >>= >>>=