added method in valid parentheses

Author: TaranjeetSinghKalsi

src/main/java/com/thealgorithms/strings/ValidParentheses.java

@@ -38,4 +38,23 @@ public static boolean isValid(String s) {
         }
         return head == 0;
     }
+    public static boolean isValidParentheses(String s) {
+        int i = -1;
+        char[] stack = new char[s.length()];
+        String openBrackets = "({[";
+        String closeBrackets = ")}]";
+
+        for (char ch : s.toCharArray()) {
+            if (openBrackets.indexOf(ch) != -1) {
+                stack[++i] = ch;
+            } else {
+                if (i >= 0 && openBrackets.indexOf(stack[i]) == closeBrackets.indexOf(ch))
+                    i--;
+                else {
+                    return false;
+                }
+            }
+        }
+        return i == -1;
+    }
 }

src/test/java/com/thealgorithms/strings/ValidParenthesesTest.java

@@ -10,15 +10,18 @@ public class ValidParenthesesTest {
     @Test
     void testOne() {
         assertTrue(ValidParentheses.isValid("()"));
+        assertTrue(ValidParentheses.isValidParentheses("()"));
     }
 
     @Test
     void testTwo() {
         assertTrue(ValidParentheses.isValid("()[]{}"));
+        assertTrue(ValidParentheses.isValidParentheses("()[]{}"));
     }
 
     @Test
     void testThree() {
         assertFalse(ValidParentheses.isValid("(]"));
+        assertFalse(ValidParentheses.isValidParentheses("(]"));
     }
 }