grails - 如何找到grails中每个元素的出现次数？

Question

我想获得所有数字及其发生次数的计数。
像1 = 4,2 = 3等

def list=[1,1,1,2,1,2,3,2,3,4,9,4,6,3,6]

Answer 1

def list=[1,1,1,2,2,2,3,3,1,6,4,6,5,4]
def countMap=[:]
 list.each{
  if(countMap[it]){
   countMap[it]=countMap[it]+1
  }else{
   countMap[it]=1
  }
}