用键盘录入，输入字符串，统计字符串各个字符的数量
字符串If~you-want~to~change-your_fate_I_think~you~must~come-to-the-dark-horse-to-learn-java"
统计结果-(9)I(2)_(3)a(7)c(2)d(1)e(6)f(2)g(1)h(4)i(1)j(1)k(2)l(1)m(2)n(4)o(8)r(4)s(2)t(8)u(4)v(1)w(1)y(3)~(6)

用键盘录入，输入字符串，统计字符串各个字符的数量
字符串If~you-want~to~change-your_fate_I_think~you~must~come-to-the-dark-horse-to-learn-java"
统计结果-(9)I(2)_(3)a(7)c(2)d(1)e(6)f(2)g(1)h(4)i(1)j(1)k(2)l(1)m(2)n(4)o(8)r(4)s(2)t(8)u(4)v(1)w(1)y(3)~(6)