I have an excel file with following data (dummy)
a b c
d b c
e b c
f b c
g b c
e b c
d b c
d b c
d b c
I am reading this file and storing the result in a Set so that duplicates can be removed and I only get unique list. Below is the what I tried
FileInputStream file = new FileInputStream(new File("C:\\Users\\harshita.sethi\\Desktop\\ALLOT010T_Input_Keywords.xls"));
HSSFWorkbook w = new HSSFWorkbook(file);
HSSFSheet sheet = w.getSheetAt(0);
int totalrows = sheet.getLastRowNum();
System.out.println(sheet.getRow(0).getPhysicalNumberOfCells());
String[][] data = new String[totalrows+1][sheet.getRow(0).getPhysicalNumberOfCells()];
Set<String[]> keySet = new HashSet<>();
for (int i = 0; i <= totalrows; i++) {
for (int j = 0; j < sheet.getRow(0).getPhysicalNumberOfCells(); j++) {
HSSFCell cell = sheet.getRow(i).getCell(j);
// writing keywords from excel into a hashmap
data[i][j]=cell.getRichStringCellValue().getString();
}
keySet.add(data[i]);
}
Iterator<String[]> iterator = keySet.iterator();
System.out.println("Output Set is as below");
while(iterator.hasNext()){
String[] next = iterator.next();
System.out.println(next[0] + "\t"+ next[1] +"\t "+next[2]);
}
The output of this code is as shown below
Output Set is as below
d b c
e b c
a b c
d b c
d b c
g b c
e b c
f b c
d b c
The set didn't remove the duplicate. What other approach can I used to eliminate these duplicates. Any column can have different or same value. So I cannot remove duplicates based on a particular column.
I want the entire row to be unique.
PS: This data is just dummmy. In real scenario I have more columns and any column value can be different which will make the row unique.
Set<String[]> can't use a HashSet implementation, since arrays don't override the default hashCode() and equals() implementation of the Object class.
Your alternatives are to use a Set<List<String>> (i.e. convert each String[] to List<String>, which can be done easily with Arrays.asList()) or a TreeSet<String[]> with a custom Comparator<String[]>.
For example :
Set<List<String>> keySet = new HashSet<>();
for (int i = 0; i <= totalrows; i++) {
for (int j = 0; j < sheet.getRow(0).getPhysicalNumberOfCells(); j++) {
HSSFCell cell = sheet.getRow(i).getCell(j);
// writing keywords from excel into a hashmap
data[i][j]=cell.getRichStringCellValue().getString();
}
keySet.add(Arrays.asList(data[i]));
}
Iterator<List<String>> iterator = keySet.iterator();
System.out.println("Output Set is as below");
while(iterator.hasNext()){
List<String> next = iterator.next();
System.out.println(next.get(0) + "\t"+ next.get(1) +"\t "+next.get(2));
}
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