arrayList的合并以及删除重复元素

arrayList的合并:

package listTest;//arrayList的合并

import java.util.ArrayList;

public class arrayListTest {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
addList();
}

private static void addList()
{
int i=0;
ArrayList<Number> list1=new ArrayList<Number>();
ArrayList<Number> list2=new ArrayList<Number>();

list1.add(1);
list2.add(2);
list1.addAll(list2);

for (Number number : list1) {
System.out.println("第"+i+"个数为："+number+" ");
}

}

}

删除arrayList中重复元素：

HashSet<Number> hslist= new HashSet<Number>(list);
list.clear();
list.addAll(hslist);

或者

for (int i = 0; i < list.size() - 1; i++) {
for (int n = list.size() - 1; n > i; n--) {
if (list.get(n).equals(list.get(i))) {
list.remove(n);
}
}
}