null value or empty string

Yulia Published at Java

Yulia :

I tried to use counter to count the amount of null or empty string. But it always failed. I print them to test it.

System.out.println(samples.get(0).getAuthor2());
System.out.println(samples.get(0).getAuthor2() == " ");
System.out.println(samples.get(0).getAuthor2().isEmpty());
System.out.println(samples.get(0).getAuthor2() == null);

The result is like this. screenshot If these are all false, what is this blank?

Francesco Genta :

To test String you have to use equals method so you have

System.out.println(samples.get(0).getAuthor2().equals(" "));

to be true

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edited at2020-05-23

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