沒有方法簽名：java.lang.Integer.call（）適用於參數類型：（java.lang.Integer）values：[1]

Question

動態片段2(i-1)在內部for循環在以下常規碼？如果我用2i或i+1或任何硬編碼號碼（例如6）works fine替換它。

1  class Algorithms { 
    2  static def printTriangle(n){ 
    3   for(i in 1..n){ 
    4   if(i>1){ 
    5    for(j in 1..2(i-1)){ print 1 } 
    6    } else { print 1 } } //end of inner loop 
    7    println "" 
    8   } //end of outer loop 
    9  } 

24  static def main(args){ 

26   printTriangles(4) 
27  } 
28 } 

堆棧跟蹤是

1 
Caught: groovy.lang.MissingMethodException: No signature of method: java.lang.Integer.call() is applicable for argument types: (java.lang.Integer) values: [1] 
Possible solutions: wait(), any(), abs(), wait(long), wait(long, int), each(groovy.lang.Closure) 
groovy.lang.MissingMethodException: No signature of method: java.lang.Integer.call() is applicable for argument types: (java.lang.Integer) values: [1] 
Possible solutions: wait(), any(), abs(), wait(long), wait(long, int), each(groovy.lang.Closure) 
    at Algorithm.printTriangle(Algorithm.groovy:5) 
    at Algorithm$printTriangle.callStatic(Unknown Source) 
    at Algorithm.main(Algorithm.groovy:26) 

Answer 1

Aghh，我沒有做數學，下面的代碼工作。

for(j in 1..2*(i-1)){}