一个去除重复元素的方法
/**
* remove list duplicate element
* @param list
*/
public static List removeListDuplicateElement(List list) {
if (list.size() > 1) {
for (int i = 0; i < list.size() - 1; i++) {
for (int j = list.size() - 1; j > i; j--) {
if (list.get(j).equals(list.get(i))) {
list.remove(j);
}
}
}
}
return list;
}
for (int j = list.size() - 1; j > i; j--)这里报空指针异常
java.lang.NullPointerException: null
at com.dataAnalysis.utils.ListUtils.removeListDuplicateElement(ListUtils.java:14) ~[classes/:na]