Scala（七）跳出循环的三种方式

1. 基于boolean类型的变量

   1. while循环

      package com.lyz.six
      object BreakLearn {
        def main(args: Array[String]): Unit = {
          var flag = true
          var n = 0
          while (flag) {
            n += 1
            println(n)
            if (n == 10) {
              flag = false
            }
          }
        }
      }

   2. for循环，利用if守卫

      package com.lyz.six 
      object BreakLearn { 
        def main(args: Array[String]): Unit = {   
          var n1 = 0
          var flag1 = true
          for (i <- 1 to 10 if flag1) {
            n1 += 1
            println(n1)
            if (n1 == 10) {
              flag1 = false
            }
          }
        }
      }

2. 使用Breaks类的break方法

   package com.lyz.six
   import scala.util.control.Breaks._
   object BreakLearn1 {
     def main(args: Array[String]): Unit = {
       breakable {
         for (i <- 1 to 10) {
           if(i==5) break()
           println(i)
         }
       }
     }
   }

3. 使用嵌套函数与return

   package com.lyz.six 
   object BreakLearn1 {
     def main(args: Array[String]): Unit = {
       println(outer())
     }
     def outer(): Int ={
       var n=0
       def inneer(): Unit ={
         for (i <- 1 to 10){
            n+=1
           if (i==9){
             return
           }
           n
         }
       }
       inneer()
       n
     }
   }