java數組轉換list

Ⅰ java/ANDROID 數組轉換為LIST

String[][] datas = {{"aaa","aa1","aa11"},{"bbb","bb1","bb11"},{"ccc","cc1","cc11"},
{"aaa","aa2","aa22"},{"bbb","bb2","bb22"},{"aaa","aa3","aa33"},
{"bbb","bb3","bb33"}};

Map<String , DetailModel> map = new HashMap<String , DetailModel>();
for (String[] strings : datas) {

DetailModel detail = new DetailModel();

detail.setPron(strings[0]);

List<MeanPhrase> li = new ArrayList<MeanPhrase>();
MeanPhrase mean = new MeanPhrase();
mean.setMean(strings[1]);
mean.setPhrase(strings[2]);
li.add(mean);

detail.setMpList(li);

//如果已存在相同的key，如aaa,則在key對應的對象的list中增加元素
if(map.containsKey(detail.getPron())){
map.get(detail.getPron()).getMpList().addAll(li);
}else{//否則直接新增
map.put(detail.getPron(), detail);
}
}
//將map轉為list
List<DetailModel> resultList = new ArrayList<DetailModel>(map.values());

for (DetailModel detailModel : resultList) {
System.out.println(detailModel);
}
//輸出map中的值以及分組結果記錄數
System.out.println("======================================");
Set<String> keySet = map.keySet();
for (String string : keySet) {
System.out.println(string+"："+map.get(string).getPron()+"："+map.get(string).getMpList().size());
}

控制台輸出結果：
DetailModel [pron=aaa, mpList=[MeanPhrase [mean=aa1, phrase=aa11], MeanPhrase [mean=aa2, phrase=aa22], MeanPhrase [mean=aa3, phrase=aa33]]]
DetailModel [pron=ccc, mpList=[MeanPhrase [mean=cc1, phrase=cc11]]]
DetailModel [pron=bbb, mpList=[MeanPhrase [mean=bb1, phrase=bb11], MeanPhrase [mean=bb2, phrase=bb22], MeanPhrase [mean=bb3, phrase=bb33]]]
======================================
aaa：aaa：3
ccc：ccc：1
bbb：bbb：3

注意：DetailModel [pron=ccc, mpList=[MeanPhrase [mean=cc1, phrase=cc11]]]輸出這樣的形式是因為我實體類重寫了toString()方法的原因，你那不重寫的話輸出的應該只是對象地址。

Ⅱ java中數組如何轉換成List

//小例子
//這里注意的是，不能是基本類型，必須是包裝類Byte[]可以。
publicclassDemo{
publicstaticvoidmain(String[]args)throwsException{
String[]arr={"asd","sd","df"};
Listlist=Arrays.asList(arr);
System.out.println(list);
}
}

Ⅲ Java中有將二維數組轉化為二維的List的方法嗎即ArrayList<ArrayList<Object>>的形式

沒有，二維數組那就用循環遍歷吧。

publicstaticvoidmain(String[]args)//NOCHECKSTYLE
{

intm=4;
intn=5;
Integerarray[][]=newInteger[m][n];
List<Integer[]>list_array=Arrays.asList(array);
List<List<Integer>>list_integer=newArrayList<List<Integer>>();
for(inti=0;i<list_array.size();i++)
{
list_integer.add(Arrays.asList(list_array.get(i)));
}

for(List<Integer>innerList:list_integer)
{
for(Integervalue:innerList)
{
System.out.print(value+"");
}
System.out.println();
}
}