将 StringBuilder 内容“传输”到 Java 中的新 ArrayList
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'transferring' StringBuilder contents to a new ArrayList in java
提问by OcelotXL
If I have two class constants:
如果我有两个类常量：
List<String> workingList= new ArrayList<String>();
StringBuilder holder = new StringBuilder(50);
both residing within, call it class StringParserand primary method readStuff()...
两者都驻留在其中，称之为类StringParser和主要方法readStuff()......
public class StringParser{
public void readStuff(){
//parsing logic and adding <String> elements to
//said workingList...
}//end of method readStuff
followed by a method where I inspect the contents of workingList...
其次是一种方法，我检查workingList...的内容
public String someReaderMethod()
{
int ind = 0;
for(int i = 0; i < workingList.size();i++)
{
if(workingList.get(i).contains(someExp))
{
workingList.remove(ind);
holder.append(workingList.get(i).toString());
}
else
{
++ind;
}
}
return holder.toString();
}
}
...given that StringBuilderholder now contains what workingListhas removed, is there a way I can 'pass' the contents of StringBuilderto a new ArrayList?
...鉴于该StringBuilder持有人现在包含workingList已删除的内容，有没有办法可以将 的内容“传递”StringBuilder给新的ArrayList？
采纳答案by aradhak
Is there a reason why u want to use a StringBuilder? You can directly insert the values into a new ArrayList. I think you could do it in a simpler way.
你有什么理由想要使用 StringBuilder 吗？您可以直接将值插入到新的 ArrayList 中。我认为你可以用更简单的方式做到这一点。
List<String> discardedList = new ArrayList<String>();
public void readStuff() {}
public static List<String> someReaderMethod()
{
for(int i = 0; i < workingList.size(); i++)
{
if(workingList.get(i).contains(someExp))
{
discardedList.add(workingList.get(i));
workingList.remove(i);
}
}
return discardedList;
}
回答by Amit Deshpande
You will need a deliminatorto parse string and then you can use Splitmethod and convert String[] to ArrayList.
您将需要一个deliminator来解析字符串，然后您可以使用Split方法并将 String[] 转换为 ArrayList。
holder.append(tempList.get(i));
holder.append(";");//Deliminator
Now when you have to use it you need to do
现在当你必须使用它时，你需要做
String[] strings =holderString.split(";");
List<String> list = Arrays.asList(strings);
回答by Rohit Jain
While appending your List elements to your StringBuilderobject, you need to append an extra delimiter after every append..
在将 List 元素附加到StringBuilder对象时，您需要在每次附加后附加一个额外的分隔符。
Later on, you can split the Stringin StringBuilderon that delimiter, and then convert your String array thus obtained to an ArrayList..
稍后，您可以在该分隔符上拆分Stringin StringBuilder，然后将由此获得的 String 数组转换为ArrayList..
