I am trying to write a method that takes an InputStream variable and returns a HashMap back to main. However I'm stuck on how to return the variable of HashMap. New to Java so I do not know what I'm doing wrong.For the return statement: pairsCount cannot be resolved to variable. Thanks in advance.
private static Map<String, Integer> getHashMap(InputStream in)
{
if (in != null)
{
// Using a Scanner object to read one word at a time from the input stream.
@SuppressWarnings("resource")
Scanner sc = new Scanner(in);
String word;
System.out.println(" - Assignment 1 -s%n%n\n");
// Continue getting words until we reach the end of input
List<String> inputWords = new ArrayList<String>();
while (sc.hasNext())
{
word = sc.next();
if (!word.equals(null))
{
inputWords.add(word);
}
}
Map<String, Integer> pairsCount = new HashMap<>();
Iterator<String> it = inputWords.iterator();
String currentWord = null;
String previousWord = null;
Integer wordCount = 0;
while(it.hasNext())
{
currentWord = it.next();
if( previousWord != null )
{
String key = previousWord.concat( "#" ).concat( currentWord );
if( pairsCount.containsKey( key ) )
{
Integer lastCount = pairsCount.get( key );
pairsCount.put( key, lastCount + 1 );
wordCount = wordCount + lastCount;
}
else
{
pairsCount.put( key, 1 );
wordCount = 1;
}
}
previousWord = currentWord;
}
}
return (pairsCount);
}
This is probably because variable pairsCount is out of its scope.
You define it inside of the if block but trying to return it outside.
So try define Map pairsCount = new HashMap<>(); before the if (in != null)
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.