我有以下服務等級：
public class SheetSorter {
// sorts the sheet
public static Sheet sortSheet(Sheet sheet) {
List<String[]> list = sheet.getSheet().stream().collect(Collectors.toList());
Collections.sort(list, new Comparator<String[]>() {
@Override
public int compare(String[] arr1, String[] arr2) {
if (Long.parseLong(arr1[3]) == Long.parseLong(arr2[3])) {
return (int) (Long.parseLong(arr1[4]) - Long.parseLong(arr2[4]));
}
else {
return (int) (Long.parseLong(arr1[3]) - Long.parseLong(arr2[3]));
}
}
});
sheet.setSheet(list);
return sheet;
}
}
如您所見，這些sortSheet方法實作sort了 oncolumn 4和thenbyon column 5。有什么方法可以將其轉換為Integer... columnOrder作為引數，以便在按該順序提供的剩余引數上運行排序columnOrder[0]和“thenBies”（或者是“thenBys”？）？
編輯：
@Holger 的建議
// sorts the sheet
public static Sheet sortSheet(Sheet sheet) {
List<String[]> list = new ArrayList<>(sheet.getSheet());
Collections.sort(list, new Comparator<String[]>() {
@Override
public int compare(String[] arr1, String[] arr2) {
if (Long.parseLong(arr1[3]) == Long.parseLong(arr2[3])) {
return Long.compare(Long.parseLong(arr1[4]), Long.parseLong(arr2[4]));
}
else {
return Long.compare(Long.parseLong(arr1[3]), Long.parseLong(arr2[3]));
}
}
});
sheet.setSheet(list);
return sheet;
}
我的解決方案（尚未檢查）：
public static Sheet sortSheet(Sheet sheet, Integer... indices) {
List<String[]> list = new ArrayList<>(sheet.getSheet());
Collections.sort(list, new Comparator<String[]>() {
@Override
public int compare(String[] arr1, String[] arr2) {
for (int i = 0; i < indices.length;) {
if (Long.parseLong(arr1[i]) == Long.parseLong(arr2[i])) {
i ;
}
else {
return Long.compare(Long.parseLong(arr1[i]), Long.parseLong(arr2[i]));
}
}
return 0;
}
});
sheet.setSheet(list);
return sheet;
}
uj5u.com熱心網友回復：
一種簡單的方法是僅Comparator根據 int 陣列進行組合：
public static Sheet sortSheet(Sheet sheet, int...indices) {
if(indices.length == 0) throw new IllegalArgumentException();
Comparator<String[]> comp = Comparator.comparingLong(s -> Long.parseLong(s[indices[0]]));
for(int i = 1; i < indices.length; i ) {
int e = i;
comp = comp.thenComparing(Comparator.comparingLong(s -> Long.parseLong(s[indices[e]])));
}
List<String[]> list = sheet.getSheet().stream().collect(Collectors.toList());
Collections.sort(list, comp);
sheet.setSheet(list);
return sheet;
}
comp以上是通過Comparator根據 after 的索引組合其他 s來創建的indices[0]。
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