統(tǒng)計(jì)字符串中去除空格各個(gè)字符出現(xiàn)的個(gè)數(shù)

    val text = "This is A Text!"
    Observable.from(text.toCharArray().asIterable())
            .filter { !it.isWhitespace() }
            .groupBy { it }
            .map {
                o ->
                o.count().subscribe {
                    println("${o.key}:${it}")
                }
            }
            .subscribe()

打印結(jié)果

TIM截圖20170717175323.png