Thread: Logical error and having trouble HELP!

wassup! ok i am new to this forum and would like to ask someing i am having trouble with my end of the PAT mark ( practical assessment task) ok so we need to make a password checker that allows the user to enter a password and then the program checks if it meets certain criteria in this case the criteria is as follows : Must have between 5-15 characters it must include both letters and numbers and cannot contain vowels this is my code so far ( a bit messy i know but work with me here)

public class Password {
public static void main(String[] args) {
String pass;
String pass1 = "T";
String pass2 = "T";
String pass3 = "F";
pass = JOptionPane.showInputDialog("Please input a password that meets the following criteria :"
+ "\n1. Must include both letters and numbers"
+ "\n2. Must be between 5-15 characters"
+ "\n3. Must contain no vowels");
int length = (pass.length());

if (length < 4 ||length > 20)
{
pass1 = "T";
}


if ("T".equals(pass1))
{
for (int i = 0; i <= length; i++)
{
if (pass.charAt(i) == 'a' ||pass.charAt(i) == 'A'||pass.charAt(i) == 'e'||pass.charAt(i) == 'E' ||
pass.charAt(i) == 'i' || pass.charAt(i) == 'I' || pass.charAt(i) == 'o' || pass.charAt(i) == 'O'||pass.charAt(i) == 'u'||
pass.charAt(i) == 'U')
{
pass2 = "F";
}
}
}
if ("T".equals(pass1))
{

}
if ("F".equals(pass2));
{
JOptionPane.showMessageDialog(null, "Sorry your password does not comply with the criteria");
}



if ("F".equals(pass1))
{

}

}
ok and this is the highly frustrating error i a recieving :

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 5
at java.lang.String.charAt(String.java:687)
at DeathStrike.Password.main(Password.java:33)
Java Result: 1

please help guys!

my ide changed it automatically please give me a code suggestions

Like a said im only in grade 10 i dont know most of the stuff you were asking about, but without your help i managed to create the code perfectly.

public class Password {
public static void main(String[] args) {
String pass;
String pass1 = "T";
String pass2 = "T";
String pass3 = "F";
String pass4 = "F";
pass = JOptionPane.showInputDialog("Please input a password that meets the following criteria :"
+ "\n1. Must include both letters and numbers"
+ "\n2. Must be between 5-15 characters"
+ "\n3. Must contain no vowels");
int length = (pass.length());

if (length <= 4 ||length >= 21)
{
pass1 = "F";
}
if (pass1 == "T")
{

if (pass.contains("a") || pass.contains("A") || pass.contains("e") || pass.contains("E") || pass.contains("i") || pass.contains("I")
|| pass.contains("o") || pass.contains("O") || pass.contains("u") || pass.contains("U"))
{
pass2 = "F";
}
if (pass2 == "F")
{
JOptionPane.showMessageDialog(null, "Sorry! Your password contains vowels");
}
else
{
if (pass.contains("1") || pass.contains("2") || pass.contains("3") || pass.contains("4") || pass.contains("5") || pass.contains("6")
|| pass.contains("7") || pass.contains("8") || pass.contains("9") || pass.contains("0"))
{
pass3 = "T";
}
if (pass3 == "T")
{
if (pass.contains("b") || pass.contains("B") || pass.contains("c") || pass.contains("C") || pass.contains("d") || pass.contains("D")
|| pass.contains("f") || pass.contains("F") || pass.contains("g") || pass.contains("G")||pass.contains("h") || pass.contains("H") || pass.contains("j") || pass.contains("J") || pass.contains("k") || pass.contains("K")
|| pass.contains("l") || pass.contains("L") || pass.contains("m") || pass.contains("M") || pass.contains("n") || pass.contains("N") || pass.contains("p") || pass.contains("P") || pass.contains("q") || pass.contains("Q")
|| pass.contains("r") || pass.contains("R") || pass.contains("s") || pass.contains("S") || pass.contains("t") || pass.contains("T") || pass.contains("v") || pass.contains("V") || pass.contains("w") || pass.contains("W")
|| pass.contains("x") || pass.contains("X") || pass.contains("y") || pass.contains("Y") || pass.contains("z") || pass.contains("Z"))
{
pass4 = "T";
}
if (pass4 == "T")
{
JOptionPane.showMessageDialog(null, "Your password meets all the required fields! your password is: " + pass);
}
else
{
JOptionPane.showMessageDialog(null, "Your password does not contain any consenants");
}
}
else
{
JOptionPane.showMessageDialog(null, "Your password contains no numbers");
}
}
}
else
{
JOptionPane.showMessageDialog(null, "Sorry! Your password is either to long or to short");
}



}

}
Thanks for nothing