Text from file

cookie23

I want to tjek if the first letter in the test.txt file is "t". Why does this not work?:

String lines[] = loadStrings("test.txt");
println(lines[0]);

String letter = lines[0].substring(1, 2);
println(letter);

if(letter == "t"){
  print("first letter is t!");
}else{
  print("first letter is not t!");
}

The console says:

ttt-test
t
first letter is not t!

TfGuy44

Do not compare strings for equality with == Use .equals()

Example:

if( letter.equals("t") ){

koogs

there's a startsWith method on String that does this...

if (lines[0].startsWith("t")) {
...
}

GoToLoop

Besides substring() + equals(), and startsWith(), given you're only interested in checking out 1 char within a String, you can use its charAt() method too: O:-)

https://Processing.org/reference/String_charAt_.html
https://Processing.org/reference/char.html

String[] lines = { "template", "contemplate" };
String word;
boolean isT;

word = lines[0];
isT = word.charAt(0) == 't';
println("First letter in", word, isT? "is" : "isn't", "t!");

word = lines[1];
isT = word.charAt(0) == 't';
println("First letter in", word, isT? "is" : "isn't", "t!");

exit();