for-loop - 如何在groovy的each循环中使用 "continue"

Question

我是 groovy 的新手(在 java 上工作)，尝试使用 Spock 框架编写一些测试用例。我需要使用“each循环”将以下Java代码片段转换为groovy代码片段

Java 代码片段:

List<String> myList = Arrays.asList("Hello", "World!", "How", "Are", "You");
for( String myObj : myList){
    if(myObj==null) {
        continue;   // need to convert this part in groovy using each loop
    }
    System.out.println("My Object is "+ myObj);
}

精彩片段:

def myObj = ["Hello", "World!", "How", "Are", "You"]
myList.each{ myObj->
    if(myObj==null){
        //here I need to continue
    }
    println("My Object is " + myObj)
}

Answer 1

要么使用return，因为闭包基本上是一个以每个元素作为参数调用的方法，例如

def myObj = ["Hello", "World!", "How", "Are", "You"]
myList.each{ myObj->
    if(myObj==null){
        return
    }
    println("My Object is " + myObj)
}

或者将您的模式切换为

def myObj = ["Hello", "World!", "How", "Are", "You"]
myList.each{ myObj->
    if(myObj!=null){
        println("My Object is " + myObj)
    }
}

或者在之前使用findAll来过滤掉null对象

def myList = ["Hello", "World!", "How", "Are", null, "You"]
myList.findAll { it != null }.each{ myObj->
    println("My Object is " + myObj)
}

或者，如果您担心首先遍历整个集合进行过滤，然后才从 each 开始，您也可以利用 Java 流

def myList = ["Hello", "World!", "How", "Are", null, "You"]
myList.stream().filter { it != null }.each{ myObj->
    println("My Object is " + myObj)
}