Stack Overflow Asked by BENJAMIN WEED on January 5, 2022
I know this error has been asked a lot. I have looked at them but still don’t really understand how it applies to my problem. I am trying to write a program that creates a diamond pattern from a string.
public static String nameDiamond(String s) {
int len = s.length();
int i = 0;
String out = "";
while(i < len) {
out = out + s.substring(0, i + 1) + "n";
i++;
}
while(i > 0) {
int numSpaces = len - i + 1;
for(int j = 0; j < numSpaces; j++)
out = out + " ";
out = out + s.substring(len - i + 1, i - 1) + "n";
i--;
}
return out;
}
Now my understanding of substring
is, that it is structured like s.substring(startIndex, endIndex)
and a cause of this error can be when the end index is less then the start but I don’t think this is the problem here. I also saw some causes of the error is when something does not exist but again I don’t think this is the problem. What am I missing?
When it is tested with "Marty" it says -1
and with "Bill Nye" it says -2
. Would the space be causing this?
I looked at lots of other versions of the questions but the ones that seemed relevent were:
StringIndexOutOfBoundsException: string index out of range
StringIndexOutOfBoundsException: String index out of range: -1
But I don’t think they apply.
For reference, this is the problem:
https://www.codestepbystep.com/problem/view/java/strings/nameDiamond
Here is one you can use as an example. It doesn't do exactly what you want but it will illustrate one important thing. For fixed width fonts, each row must be an odd number of characters. Otherwise they won't line up properly.
If n
is an even number, this particular version will print the same diamond for n
and n+1
. It is also limited by the string of spaces.
public static void printDiamond(int len) {
String str = "*";
String space = " ";
for (int i = 0; i < len/2 + 1; i++) {
System.out.print(space.substring(0,len/2-i));
System.out.println(str);
str = str+"**";
}
str = str.substring(2);
for(int i = 0; i < len/2; i++) {
str = str.substring(2);
System.out.print(space.substring(0,i+1));
System.out.println(str);
}
}
As you debug your program, use ubiquitous print statements to print the different variables such as indices and string lengths.
Answered by WJS on January 5, 2022
2 Asked on November 20, 2021
3 Asked on November 20, 2021
0 Asked on November 20, 2021 by asad-saeeduddin
1 Asked on November 20, 2021 by saleel-almajd
9 Asked on November 20, 2021 by stewart_r
3 Asked on November 20, 2021 by bugaboo
15 Asked on November 20, 2021
1 Asked on November 20, 2021 by onur-klekci
1 Asked on November 20, 2021 by satishkumar-konishetti
1 Asked on November 20, 2021
0 Asked on November 20, 2021 by afnan-ahmad
1 Asked on November 20, 2021 by k-ter
clean architecture domain driven design hexagonal architecture
1 Asked on November 20, 2021
1 Asked on November 20, 2021 by natehawkboss
2 Asked on November 20, 2021 by rob-none
1 Asked on November 20, 2021 by hidden-layer
4 Asked on November 20, 2021 by michael-kostiuchenko
Get help from others!
Recent Questions
Recent Answers
© 2023 AnswerBun.com. All rights reserved. Sites we Love: PCI Database, UKBizDB, Menu Kuliner, Sharing RPP