reading and rewriting ( about String )

[silvathins]

Hi guys

for example, there's a test.xlsx with 3 on A1, hello on B1

my code is like below

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InputStream inp = new FileInputStream("C:/work/test.xlsx");



Workbook wb = WorkbookFactory.create(inp);
Sheet sheet = wb.getSheetAt(0);
Row row = sheet.getRow(0);
Cell cell = row.getCell(0);



if(cell.getNumericCellValue() == 3) // A1 에 있던 숫자가 3 이랑 같냐?
System.out.println("3 is 3");
else
System.out.println("3 is not 3");



cell=row.getCell(1);

if(cell.getStringCellValue() == "hello") // A2 에 있던 문자가 hello 랑 같냐?
System.out.println("hello is hello");
else
System.out.println("hello is not hello");

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Result I expected is that

3 is 3
hello is hello

but the actual result is that

3 is 3
hello is not hello

Could you explain what the matter is?

[Tolls]

You don't use '==' to compare objects (eg Strings).
You need to use equals().
'==' will only return true if both Strings are actually the same object, not whether they have the same value.