Kotlin 集合也可以进行+= -= 还可以根据条件进行删除（removeIf）

fun main() {
    val list = listOf("Jason", "Jack", "Jacky")
    val mutableListOf = mutableListOf("Jason", "Jack", "Jacky")
    mutableListOf.add("狗蛋")
    println(mutableListOf)
    //相当于add
    mutableListOf += "张三"
    println(mutableListOf)
    // 相当于remove
    mutableListOf -= "狗蛋"
    println(mutableListOf)
    //根据条件一出
    mutableListOf.removeIf{ it.contains("J")}
    println(mutableListOf)
}

非常的时尚