ArrayList的ArrayList的ArrayList不正確的檢索

Question

我正在創建一個ArrayList的Arraylist的ArrayList，並按照下面的方式填充它。它正確填充它。我通過調試和println發現了這一點。但是，當我嘗試檢索這些整數時，它無法正常工作，並向我顯示文件的最後一個整數，我已經讀取了我的ArrayList變量的所有值。

下面是我填充的代碼，它運行良好。

Scanner sc = new Scanner(new File("e1.txt")); 
    Scanner lineSc; 
    String lineStr; 


    String lineRegEx = "(\\d+),(\\d+)"; 
    Pattern linePattern = Pattern.compile(lineRegEx); 
    Matcher matcher; 

    Integer vertex = 0, edge = 0, length = 0; 
    String strE, strL ; 
    ArrayList<Integer> tmpLE = new ArrayList<Integer>() ; 
    ArrayList<ArrayList<Integer>> singleV = new ArrayList<ArrayList<Integer>>() ; 

    sc.useDelimiter("\\n"); 


    int i = 0, j = 0; 
    while (sc.hasNextLine()) { 
     lineStr = sc.nextLine(); 
     lineSc = new Scanner(lineStr); 

     lineSc.nextInt(); 

     matcher = linePattern.matcher(lineStr); 

     while (matcher.find()) { 
       strE = matcher.group(1); 
       edge = Integer.parseInt(strE); 
       tmpLE.add(EI, edge); 
       strL = matcher.group(2); 
       length = Integer.parseInt(strL); 
       tmpLE.add(LI, length); 

       singleV.add(j ,tmpLE); 
       graph.add(i, singleV); 
       //System.out.println (graph.get(i).get(j).get(0)); 
       //System.out.println (graph.get(i).get(j).get(1)); 
       ++j; 
     } 
     j = 0; 
     ++i; 
     lineSc.close(); 
    } 
    sc.close(); 

} 

這裏是我用於檢索的代碼無法正常工作

for (int i = 0; i < N; ++i) { 
     Integer minLen = graph.get(i).get(0).get(LI); 
     System.out.println (minLen); 
     Integer choosenEdge = 0; 
     for (int j = 0; j < graph.get(i).size(); ++j) { 
      ArrayList<Integer> tmpArr = graph.get(i).get(j); 
      System.out.print(tmpArr.get(LI) + " " + minLen); //Wrong Output 
      if (minLen > tmpArr.get(LI)) 
      { 
       minLen = tmpArr.get(LI); 
       choosenEdge = graph.get(i).get(j).get(EI); 
       System.out.println (choosenEdge); // Wrong Output 
      } 

     } 

    } 

Answer 1

你需要爲每個matcher.find()循環創建ArrayList<Integer>。

tmpLE = new ArrayList<Integer>() ; 
strE = matcher.group(1); 
edge = Integer.parseInt(strE); 
tmpLE.add(EI, edge); 
strL = matcher.group(2); 
length = Integer.parseInt(strL); 
tmpLE.add(LI, length); 

singleV.add(j ,tmpLE); 
graph.add(i, singleV);