57、saleforce学习笔记（四）

List类   List在这里就是一个类

List<String> lists = new String[]{'1','3'};List<String> list1 = new String[]{'5','4'};lists.set(0,'a');lists.add(0,'b');lists.add('2');lists.addAll(list1);for(String item : lists){    System.debug('item:' + item);}Iterator<String> iterator = lists.iterator();while(iterator.hasNext()){    String item = iterator.next();    System.debug('通过iterator遍历:'+item);}if(lists.size()>0){    Integer listSize = lists.size();    lists.remove(listSize-1);}List<String> cloneList = lists.clone();for(Integer i=0;i<cloneList.size();i++){    System.debug('cloneListItem:' + cloneList.get(i));}lists.clear();if(lists.size()>0){    for(String item:lists){        System.debug('set item:' + item);    }}else{    System.debug('lists has already clear');}