如果我是你,我會分析一切只是一個時間,然後用它做任何你想要的。
這段代碼就是這樣做的,包括Integers
的解析(我懷疑你需要這些作爲值,而不是Strings
):
public void read() throws IOException {
InputStream is = getAssets().open("USCOUNTIES.txt");
InputStreamReader iz=new InputStreamReader(is);
BufferedReader bis = new BufferedReader(iz);
String line = "";
String firstNumber = "";
String secondNumber = "";
String countyName = "";
StringTokenizer st = null;
HashMap<Pair, String> map = new HashMap<>();
while((line = bis.readLine()) != null) {
st = new StringTokenizer(line, ",");
firstNumber = (String) st.nextElement();
st = new StringTokenizer((String)st.nextElement(), ">");
secondNumber = (String) st.nextElement();
countyName = ((String) st.nextElement());
countyName = countyName.substring(0, countyName.length()-1);
int num1 = Integer.parseInt(firstNumber);
int num2 = Integer.parseInt(secondNumber);
map.put(new Pair(num1, num2), countyName);
}
}
class Pair {
int num1, num2;
Pair(int num1, int num2) {
this.num1 = num1;
this.num2 = num2;
}
public boolean equals(Object other) {
if (other instanceof Pair) {
Pair np = (Pair) other;
return this.num1 == np.num1 && this.num2 == np.num2;
}
return false;
}
public int hashCode() {
return (Integer.valueOf(num1).hashCode() >> 13)^Integer.valueOf(num2).hashCode();
};
}
現在,你可以簡單地檢索每個countyName
這一行:
String s = map.get(new Pair(1,69));
並返回Aleutians East
我希望得到你開始。
EDIT
這段代碼使用2D SparseArray
(很像HashMap<Integer, Object>
)。有了這個,所有東西都按第一個數字排序。
public class Reader {
private String firstNumber = "";
private String secondNumber = "";
private String countyName = "";
private StringTokenizer stringTokenizer = null;
private SparseArray<SparseArray<String>> sparseArray = new SparseArray<SparseArray<String>>();
private SparseArray<String> temporarySparseArray = null;
public void readFromIS() throws IOException {
InputStream is = getAssets().open("USCOUNTIES.txt");
InputStreamReader iz=new InputStreamReader(is);
BufferedReader bis = new BufferedReader(iz);
String line = null;
while((line = bis.readLine()) != null) {
readLine(line);
}
}
public void readFromList() {
String[] strings = {
"0,1>Autauga;",
"0,2>Baldwin;",
"0,3>Barbour;",
"1,69>Aleutians East;",
"1,68>Aleutians West;"
};
for (String line : strings) {
readLine(line);
}
}
private void readLine(String line) {
stringTokenizer = new StringTokenizer(line, ",");
firstNumber = (String) stringTokenizer.nextElement();
stringTokenizer = new StringTokenizer((String)stringTokenizer.nextElement(), ">");
secondNumber = (String) stringTokenizer.nextElement();
countyName = ((String) stringTokenizer.nextElement());
countyName = countyName.substring(0, countyName.length()-1);
int num1 = Integer.parseInt(firstNumber);
int num2 = Integer.parseInt(secondNumber);
if (sparseArray.get(num1) == null) {
sparseArray.put(num1, new SparseArray<String>());
}
temporarySparseArray = sparseArray.get(num1);
temporarySparseArray.put(num2, countyName);
sparseArray.put(num1, temporarySparseArray);
temporarySparseArray = null;
}
public void test() {
readFromList();
String s = sparseArray.get(0).get(2);
SparseArray sa = sparseArray.get(0);
System.out.println(sa.size()); //should be 3
System.out.println(s); // should be Baldwin
}
}
並檢索與num1
開始所有的縣,說,0,你只需要使用:
SparseArray<String> startingWithZero = sparseArray.get(0);
FYI:一個SparseArray
是integers
一個HashMap
,所以不是一切都要autoboxed(從Integer
到int
,因爲您不能將原始類型放入HashMap
)。
EDIT2您打印1D sparseArray的地址。
public void printEverythingStartingWithZero() {
SparseArray<String> subSparseArray = sparseArray.get(0); //You first need a 1D sparseArray
int key = 0;
for(int i = 0; i < subSparseArray.size(); i++) {
key = subSparseArray.keyAt(i);
String county = subSparseArray.get(key); //county is the String in place (0,key)
System.out.println(county);
}
}
您需要首先檢索1D sparseArray
,並且前導零。
老實說,8秒鐘讀取3200個文件,每行3200行是相當不錯的。 – 2013-03-16 21:04:55
它是一個單一的3200內襯文件。它迭代3200次。你可能有什麼建議?我這樣做是爲了將一些文件的數據放在列表中。 – 2013-03-16 21:08:21
爲什麼你重新閱讀相同的文件** 3200次**? – CommonsWare 2013-03-16 21:08:56