for example List<List<SomeType>> result = new ArrayList<List<SomeType>>(); List<SomeType> tmp = new ArrayList<SomeType>(); for (int i=0; i<list.size(); i++) { tmp.add(list.get(i)); if ((i+1)%7 == 0) { result.add(tmp); tmp = new ArrayList<SomeType>(); } } if (tmp.size() > 0) { result.add(tmp); }
返回列表中指定的 fromIndex(包括 )和 toIndex(不包括)之间的部分视图。
现在要把100个对象装到另外10个list中
List<List<SomeType>> result = new ArrayList<List<SomeType>>();
List<SomeType> tmp = new ArrayList<SomeType>();
for (int i=0; i<list.size(); i++) {
tmp.add(list.get(i));
if ((i+1)%7 == 0) {
result.add(tmp);
tmp = new ArrayList<SomeType>();
}
}
if (tmp.size() > 0) {
result.add(tmp);
}
import java.util.List;
import java.util.ArrayList;
public class ListDemo
{
public static void main(String[] args)
{
StringBuilder[] str={new StringBuilder("a"),new StringBuilder("b"),new StringBuilder("c"),new StringBuilder("d"),new StringBuilder("e"),new StringBuilder("f"),
new StringBuilder("g"),new StringBuilder("h"),new StringBuilder("i"),new StringBuilder("j"),new StringBuilder("k"),new StringBuilder("l"),new StringBuilder("m")
,new StringBuilder("n"),new StringBuilder("o"),new StringBuilder("p"),new StringBuilder("q")};
List<StringBuilder> ls=new ArrayList<StringBuilder>(Arrays.asList(str));
List<StringBuilder> subList=ls.subList(0,6);
for(StringBuilder aSb:subList)
{
System.out.println(aSb);
}
}
}