我創(chuàng)建了一個簡單的程序，它使用不同的算法對輸入文件中的整數(shù)進(jìn)行排序。我還使用文件寫入器將結(jié)果輸出到另一個文件。不幸的是，無論我如何更改代碼，文件都會被覆蓋。有什么建議嗎？一直在谷歌上尋找答案，并嘗試改變我輸入語法的方式，但沒有任何效果。重要的位：設(shè)置作家try { FileWriter fileWriter = new FileWriter ("Sorted output.txt"); //BufferedWriter bufferedWriter = new BufferedWriter (fileWriter); PrintWriter out = new PrintWriter (new FileWriter("Sorted output.txt", true));輸出到文件 out.println("User's own data set sorted using bubble sort."); out.println(unsortedArray + Arrays.deepToString(FileOne)); out.println("Sorted Array looks like this:" + Arrays.toString(intArrayBubble)); out.println(timeToSort + bubbleSortIs + bubbleTime + "ms");它工作正常，但是它在 do while 循環(huán)中使用，帶有嵌套的 if 語句，并且每個語句都覆蓋另一個。其余代碼以防萬一需要 - 更新 - 仍然無法正常工作import java.io.*;import java.util.*;import java.util.concurrent.TimeUnit;public class PDD_Sorting { public static void main (String [] pArgs) { //Array for a file String[] FileOne; FileOne = new String[0]; int optionOne = 1, optionTwo = 2, optionThree = 3, secondaryOptionOne = 1, secondaryOptionTwo = 2, secondaryOptionThree = 3, userSelection, subUserSelection; String unsortedArray = "Unsorted array is: ", bubbleSort = "Sorted array using bubble sort: ", selectionSort = "Sorted array using selection sort: ", insertionSort = "Sorted array using insertion sort: ", timeToSort = "Time needed to sort this array using ", bubbleSortIs = "bubble sort is ", selectionSortIs = "selection sort is ", insertionSortIs = "insertion sort is ",文件不斷被覆蓋，我該如何阻止它并將其添加到文件中？
2 回答
拉莫斯之舞
TA貢獻(xiàn)1820條經(jīng)驗 獲得超10個贊
你不需要第一個FileWriter fileWriter = new FileWriter("Sorted output.txt");；這實際上是創(chuàng)建/覆蓋文件，之后您的 PrintWriter 再次打開它以進(jìn)行附加。
所以，只要改變
// ... omitting beginning
try {
FileWriter fileWriter = new FileWriter ("Sorted output.txt");
//BufferedWriter bufferedWriter = new BufferedWriter (fileWriter);
PrintWriter out = new PrintWriter (new FileWriter("Sorted output.txt", true));
do {
// ... omitting rest
至
// ... omitting beginning
try {
//BufferedWriter bufferedWriter = new BufferedWriter (fileWriter);
PrintWriter out = new PrintWriter (new FileWriter("Sorted output.txt", true));
do {
// ... omitting rest
江戶川亂折騰
TA貢獻(xiàn)1851條經(jīng)驗 獲得超5個贊
將 out.close() 移出循環(huán)
else {
System.out.println("Please enter a valid option i.e. 1,2 or 3");
tInput.next();
}
out.flush();
/* THIS -> out.close(); <- THIS */
//tInput.close();
}while (userSelection != optionThree);
out.close();
}
我試過你的代碼，你的問題不是文件被覆蓋，而是你在第一次迭代中關(guān)閉了輸出流。
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