solve valid parentheses

Author: sora0319

valid-parentheses/sora0319.java

@@ -0,0 +1,30 @@
+class Solution {
+    public boolean isValid(String s) {
+        Stack<Character> checking = new Stack<>();
+
+        for(char c : s.toCharArray()){
+            if(c == '(' || c == '{' || c == '['){
+                checking.push(c);
+                continue;
+            }
+            if(checking.empty()) return false;
+
+            if(c == ')' && checking.peek() == '('){
+                checking.pop();
+                continue;
+            }
+            if(c == '}' && checking.peek() == '{'){
+                checking.pop();
+                continue;
+            }
+            if(c == ']' && checking.peek() == '['){
+                checking.pop();
+                continue;
+            }
+            return false;
+        }
+        if(!checking.empty()) return false;
+        return true;
+    }
+}
+