list的foreach
时间: 2023-11-12 10:47:55 浏览: 38
list的foreach是一种遍历集合元素的方式,可以通过for-each循环来实现。使用for-each循环可以简洁地遍历集合中的元素,并对每个元素执行相应的操作。在遍历过程中,无法对集合中的元素进行删除操作,否则会引发ConcurrentModificationException异常。如果需要在遍历过程中删除元素,可以使用迭代器Iterator来实现。迭代器提供了remove()方法,可以安全地删除集合中的元素。通过调用Iterator的remove()方法来删除当前迭代到的元素。
相关问题
list foreach
The foreach loop is a control flow statement used in various programming languages to iterate over a collection or array of items and perform a specific action on each item in the collection. Here are some examples of foreach loops in different programming languages:
1. C#:
foreach (var item in collection)
{
// Perform action on each item in the collection
}
2. Java:
for (int item : collection)
{
// Perform action on each item in the collection
}
3. Python:
for item in collection:
# Perform action on each item in the collection
4. JavaScript:
collection.forEach(function(item) {
// Perform action on each item in the collection
});
5. PHP:
foreach ($collection as $item) {
// Perform action on each item in the collection
}
6. Ruby:
collection.each do |item|
# Perform action on each item in the collection
end
List forEach
1. Array.forEach()
2. Map.forEach()
3. Set.forEach()
4. NodeList.forEach()
5. Object.keys().forEach()
6. Object.values().forEach()
7. Object.entries().forEach()
8. String.prototype.forEach()
9. TypedArray.prototype.forEach()