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GeezerVison is showing github.com — Java/DataStructures/Stacks/BalancedBrackets.java at master · JavaInCloud/Java

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BalancedBrackets.java

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package DataStructures.Stacks;
import java.util.Stack;
/**
* The nested brackets problem is a problem that determines if a sequence of brackets are properly
* nested. A sequence of brackets s is considered properly nested if any of the following conditions
* are true: - s is empty - s has the form (U) or [U] or {U} where U is a properly nested string - s
* has the form VW where V and W are properly nested strings For example, the string "()()[()]" is
* properly nested but "[(()]" is not. The function called is_balanced takes as input a string S
* which is a sequence of brackets and returns true if S is nested and false otherwise.
*
* @author akshay sharma
* @author <a href="https://github.com/khalil2535">khalil2535<a>
* @author shellhub
*/
class BalancedBrackets {
/**
* Check if {@code leftBracket} and {@code rightBracket} is paired or not
*
* @param leftBracket left bracket
* @param rightBracket right bracket
* @return {@code true} if {@code leftBracket} and {@code rightBracket} is paired, otherwise
* {@code false}
*/
public static boolean isPaired(char leftBracket, char rightBracket) {
char[][] pairedBrackets = {
{'(', ')'},
{'[', ']'},
{'{', '}'},
{'<', '>'}
};
for (char[] pairedBracket : pairedBrackets) {
if (pairedBracket[0] == leftBracket && pairedBracket[1] == rightBracket) {
return true;
}
}
return false;
}
/**
* Check if {@code brackets} is balanced
*
* @param brackets the brackets
* @return {@code true} if {@code brackets} is balanced, otherwise {@code false}
*/
public static boolean isBalanced(String brackets) {
if (brackets == null) {
throw new IllegalArgumentException("brackets is null");
}
Stack<Character> bracketsStack = new Stack<>();
for (char bracket : brackets.toCharArray()) {
switch (bracket) {
case '(':
case '[':
case '{':
bracketsStack.push(bracket);
break;
case ')':
case ']':
case '}':
if (bracketsStack.isEmpty() || !isPaired(bracketsStack.pop(), bracket)) {
return false;
}
break;
default: /* other character is invalid */
return false;
}
}
return bracketsStack.isEmpty();
}
public static void main(String[] args) {
assert isBalanced("[()]{}{[()()]()}");
assert !isBalanced("[(])");
}
}
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