kotlin字符串判空

Given a string, we have to check whether it is an empty, blank or NULL string.

给定一个字符串，我们必须检查它是否为空，空白或NULL字符串。

Example:

例：

    Input:
str = ""
Output:
True

用于在Kotlin中检查Empty，Blank或NULL字符串的程序 (Program to check for Empty, Blank or NULL string in Kotlin)

package com.includehelp.basic
//Main Function, entry Point of Program
fun main(args: Array<String>) {
///Nullable String
val s1: String?=null
//Empty String
val s2: String=""
//Blank String, Contained only white spaces
val s3="         "
println("String s1 is  isNullOrEmpty :  ${s1.isNullOrEmpty()}")
println("String s2 is  isEmpty       :  ${s2.isEmpty()}")
println("String s3 is  isBlank       :  ${s3.isBlank()}")
}

Output

输出量

String s1 is  isNullOrEmpty :  true
String s2 is  isEmpty       :  true
String s3 is  isBlank       :  true

翻译自: https://www.includehelp.com/kotlin/check-for-empty-blank-or-null-string.aspx

kotlin字符串判空