1.Boolean
val bl: Boolean = true
2.基本类型
Screen Shot 2020-04-15 at 11.14.02 PM.png
val along: Long = 123
val aInt: Int = 123
val aFloat: Float = 123.0F
val aDouble: Double = 123.0
//不可隐式转换 必须显示转换
val aLong: Long = aInt.toLong()
3.字符和字符串
Screen Shot 2020-04-16 at 12.06.21 AM.png
val aChar： Char = ‘a’
val cChar: Char = \u000f' //Unicode
Screen Shot 2020-04-16 at 12.11.38 AM.png
4.数组
Screen Shot 2020-04-16 at 12.52.47 AM.png
5.类和对象
1>.注意：可以在类名后面直接写构造方法的参数
Screen Shot 2020-04-16 at 12.25.51 AM.png
2>.智能类型转换（Parent is Child）
Screen Shot 2020-04-16 at 12.33.17 AM.png
6.包 package 和 区间
1>包
Screen Shot 2020-04-16 at 12.42.40 AM.png
Screen Shot 2020-04-16 at 12.40.51 AM.png
2>.区间
Screen Shot 2020-04-16 at 12.48.07 AM.png
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