Java 错误：无法从 void 转换为 int[]
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Java Error: Cannot convert from void to int[]
提问by rharrison33
I don't understand why java thinks the array "thisRow" is void when it is passed into Arrays.sort(thisRow). "thisRow" appears to be an int[] to me. What is the issue here?
我不明白为什么 java 认为数组“thisRow”在传递到 Arrays.sort(thisRow) 时为空。“thisRow”对我来说似乎是一个 int[] 。这里有什么问题？
Error Message: "Type mismatch: cannot convert from void to int[] at Test.mySort(Test.java:57)"
错误消息：“类型不匹配：无法在 Test.mySort(Test.java:57) 处从 void 转换为 int[]”
private static int[][] mySort(int[][] anArray) {
for(int i = 0; i < anArray.length; i++){
int thisRow[] = getRow(anArray, i);
int[] sorted = Arrays.sort(thisRow);
}
}
//This method will get the specified row out of the array.
private static int[] getRow(int[][] anArray, int row) {
int thisRow[] = new int[anArray[row].length];
for(int j = 0; j < anArray[row].length; j++){
thisRow[j] = anArray[row][j];
}
return thisRow;
}
回答by kosa
Arrays.sortreturns voidnot int[]type.
Arrays.sort返回的void不是int[]类型。
As per javadoc
根据 javadoc
Sorts the specified array of ints into ascending numerical order. The sorting algorithm is a tuned quicksort, adapted from Jon L. Bentley and M. Douglas McIlroy's "Engineering a Sort Function", Software-Practice and Experience, Vol. 23(11) P. 1249-1265 (November 1993). This algorithm offers n*log(n) performance on many data sets that cause other quicksorts to degrade to quadratic performance
将指定的整数数组按数字升序排序。排序算法是一个经过调整的快速排序，改编自 Jon L. Bentley 和 M. Douglas McIlroy 的“设计排序功能”，软件实践和经验，卷。23(11) P. 1249-1265（1993 年 11 月）。该算法在许多数据集上提供 n*log(n) 性能，导致其他快速排序降级为二次性能
Replace
代替
int[] sorted = Arrays.sort(thisRow);
with
和
Arrays.sort(thisRow);
回答by Andrzej Doyle
Arrays.sortsorts the array in-place (by mutating the existing object), and doesn't return anything. Hence you should replace
Arrays.sort就地排序数组（通过改变现有对象），并且不返回任何内容。因此你应该更换
int[] sorted = Arrays.sort(thisRow);
with simply
简单地
Arrays.sort(thisRow);
回答by Subhrajyoti Majumder
Arrays#sortdoes not return int[], it returns void, it sort source array itself.
Arrays#sort不返回int[]，它返回void，它对源数组本身进行排序。
Sorts the specified array of ints into ascending numerical order. The sorting algorithm is a tuned quicksort, adapted from Jon L. Bentley and M. Douglas McIlroy's "Engineering a Sort Function", Software-Practice and Experience, Vol. 23(11) P. 1249-1265 (November 1993). This algorithm offers n*log(n) performance on many data sets that cause other quicksorts to degrade to quadratic performance.
将指定的整数数组按数字升序排序。排序算法是一个经过调整的快速排序，改编自 Jon L. Bentley 和 M. Douglas McIlroy 的“设计排序功能”，软件实践和经验，卷。23(11) P. 1249-1265（1993 年 11 月）。该算法在许多数据集上提供 n*log(n) 性能，导致其他快速排序降级为二次性能。
