檢查一個字符串是否已經在LinkedHashMap中（作爲一個值）

Question

我想檢查一個LinkedHashmap的值是否已經包含一個字符串，如果沒有，將它添加到ArrayList中。 windowSize是1和7（預定）

之間

String wholeString = "HausA HausB"; 

final Map<String, ArrayList<String>> generateMap = new LinkedHashMap<String, ArrayList<String>>(); 
final int limit = wholeString.length() - windowSize; 
    for (int i = 0; i < limit; i++) { 
     String first = wholeString.substring(i, i + windowSize); 
     String second = wholeString.substring(i + windowSize, i 
       + windowSize + 1); 

     int endKey = i + windowSize; 
     if (!generateMap.containsKey(first)) { 
      generateMap.put(wholeString.substring(i, endKey), 
        new ArrayList<String>()); 
     } 
        //check here if the String 'second' is already mapped to the key' 
        if (i < limit && !generateMap.get(first).equals(second)) { 
      generateMap.get(first).add(second); 
     } else { 
      generateMap.get(first).add(null); 
     } 
    } 

    for (Entry<String, ArrayList<String>> e : generateMap.entrySet()) { 
     System.out.println(e.getKey() + " -> " + e.getValue()+ "\n"); 
    } 

現在的輸出：

HausA -> [ ] 
ausA -> [H] 
usA H -> [a] 
sA Ha -> [u] 
A Hau -> [s] 
Haus -> [B] 
HausB -> [ ] 

如何應該是：

HausA -> [ ] 
ausA -> [H] 
usA H -> [a] 
sA Ha -> [u] 
A Hau -> [s] 
Haus -> [A,B] //<--- 
HausB -> [ ] 

謝謝您的理解幫助。

Answer 1

請參閱如何適應...

final String wholeString = " HausA HausB"; 
final Map<String, Set<String>> generateMap = new LinkedHashMap<String, Set<String>>(); 
final int windowSize = 5; 

final int limit = wholeString.length() - windowSize; 
for (int i = 0; i < limit; i++) { 
    final int endKey = i + windowSize; 
    final String 
     first = wholeString.substring(i, endKey), 
     second = wholeString.substring(endKey, endKey + 1); 
    if (!generateMap.containsKey(first)) 
    generateMap.put(first, new HashSet<String>()); 
    generateMap.get(first).add(second); 
} 

for (Entry<String, Set<String>> e : generateMap.entrySet()) { 
    System.out.println(e.getKey() + " -> " + e.getValue()); 
}