fork download
copy 
  1. import java.util.regex.*;
  2.  
  3. class Uni {
  4. 	public static boolean isProperlyNested(String toTest) {
  5. 	    int countOpen = 0;
  6. 	    for (char c : toTest.toCharArray()) {
  7. 	        if (c == '{') {
  8. 	            countOpen++;
  9. 	        } else if (c == '}') {
  10. 	            countOpen--;
  11. 	            if (countOpen < 0) return false;
  12. 	        }
  13. 	    }
  14. 	    return countOpen == 0;
  15. 	}
  16. 	public static void main (String[] args) {
  17.         String str1 = "{} {\n" +
  18.                       "    {} {}\n" +
  19.                       "} // Properly nested",
  20.                str2 = "{{\n" +
  21.                       "    {{}}\n" +
  22.                       "} {} // Not properly nested";
  23.         System.out.println(str1 + "\t" + isProperlyNested(str1));
  24.         System.out.println(str2 + "\t" + isProperlyNested(str2));
  25.     }
  26. }
Success #stdin #stdout 0.08s 380224KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
{} {
    {} {}
} // Properly nested	true
{{
    {{}}
} {} // Not properly nested	false
https://ideone.com/sIQLbn
language:
Java (12.0.1)
created:
11 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!