版权声明:No Rain No Rainbow https://blog.csdn.net/xiangyuenacha/article/details/84253553
强烈推荐使用Iterator,不会出错。
参考代码:ArrayListRemove
// 测试ArrayList删除元素
public class ArrayListRemove {
public static void main(String[] args) {
ArrayList<String> list = new ArrayList<String>();
list.add("beijing");
list.add("shanghai");
list.add("shanghai");
list.add("guangzhou");
list.add("shenzhen");
list.add("hangzhou");
// remove11(list, "shanghai");
// remove12(list, "shanghai");
// remove13(list, "shanghai");
remove14(list, "shanghai");
}
private static void print(List<String> list){
for (String item : list) {
System.out.println("元素值:" + item);
}
}
/*
* 错误
*/
public static void remove11(List<String> list, String target){
int size = list.size();
for(int i = 0; i < size; i++){
String item = list.get(i);
if(target.equals(item)){
list.remove(item);
}
}
print(list);
}
/*
* 错误
*/
public static void remove12(List<String> list, String target){
for(String item : list){
if(target.equals(item)){
list.remove(item);
}
}
print(list);
}
/*
* 强烈推荐使用Iterator,保证正确
*/
public static void remove13(List<String> list, String target){
Iterator<String> iter = list.iterator();
while (iter.hasNext()) {
String item = iter.next();
if (item.equals(target)) {
iter.remove();
}
}
print(list);
}
/*
* 正确
*/
public static void remove14(List<String> list, String target){
for(int i = list.size() - 1; i >= 0; i--){
String item = list.get(i);
if(target.equals(item)){
// List 删除元素的逻辑是将目标元素之后的元素往前移一个索引位置,最后一个元素置为 null,同时 size - 1
list.remove(item);
}
}
print(list);
}
}