Part 1, 2 & Tests Passing

pom.xml

@@ -7,6 +7,18 @@
     <groupId>io.zipcoder</groupId>
     <artifactId>collections</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.7</source>
+                    <target>1.7</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 
     <dependencies>
         <dependency>

src/main/java/io/zipcoder/ParenChecker.java

@@ -1,4 +1,100 @@
 package io.zipcoder;
 
+//import java.util.HashMap;
+//import java.util.Map;
+import java.util.Stack;
+
 public class ParenChecker {
+
+    Stack<Character> parenStack = new Stack();
+
+    //going to pass in the chars we are looking for contained within a String ''
+    public boolean parenChecker(String string) {
+        for (int i = 0; i < string.length(); i++) {
+            char charCurrent = string.charAt(i);
+            if (charCurrent == '(') {
+                parenStack.push(charCurrent);
+            }
+            if (charCurrent == ')') {   //if stack's empty, no existing pair for it to link to.
+                if (parenStack.isEmpty())
+                    return false;
+
+                char charOnStack = parenStack.peek();
+                if (charCurrent == ')' && charOnStack == '(') {
+                    parenStack.pop();
+                } else
+                    return false;
+            }
+        }
+        return parenStack.empty();
+    }
+
+    public boolean pairOfParenthesies(String string) {
+        Stack<Character> parenStack = new Stack();
+        for (int i =0; i < string.length(); i++) {
+            char currentCharacter = string.charAt(i);
+            if (currentCharacter == '[' || currentCharacter == '"' || currentCharacter == '<' || currentCharacter == '\'' || currentCharacter == '{' || currentCharacter == '(') {
+                parenStack.push(currentCharacter);
+            }
+            if (currentCharacter == ']' || currentCharacter == '"' || currentCharacter == '>' || currentCharacter == '\'' || currentCharacter == '}' || currentCharacter == ')' ) {
+
+                if (parenStack.isEmpty())
+                    return false;
+                // look at the object at the top of the stack but don't remove, PEEK
+                char finalCharacter = parenStack.peek();
+                if (currentCharacter == ']' && finalCharacter == '[' || currentCharacter == '"' && finalCharacter == '"'
+                        || currentCharacter == '>' && finalCharacter =='<' || currentCharacter == '\'' && finalCharacter == '\'' || currentCharacter == '}' && finalCharacter == '{' || currentCharacter == ')' && finalCharacter == '(') {
+                    parenStack.pop();
+                } else
+                    return false;
+            }
+        }
+        return parenStack.isEmpty();
+    }
 }
+
+    //check if characters are balanced//
+//
+//    private static boolean isBalanced(String str) {
+//        Map<Character, Character> bracketPairs = new HashMap<Character,  Character>(){
+//            {
+//                put('(', ')');
+//                put('{', '}');
+//                put('[', ']');
+//                put('<', '>');
+//            }
+//        };
+//
+//        //in order to be balanced, there ought to be an even number of chars
+//        if(str.length() % 2 !=0) {
+//            return false;
+//        }
+//        //stores opening braces in this case
+//        Stack<Character> halfBraces = new Stack<>();
+//
+//        for(int i = 0; i < str.length(); i++) {
+//            //if characters (bracket) is opening, then store into stack
+//            if(bracketPairs.containsKey(str.charAt(i))){
+//                halfBraces.push(str.charAt(i));
+//            }
+//
+//            //if closing bracket is not equal to top of stack or if stack is empty, return false
+//            else if(halfBraces.isEmpty() || bracketPairs.get(halfBraces.pop()) !=str.charAt(i)) {
+//                return false;
+//            }
+//        }
+//        return halfBraces.isEmpty() ? true : false;
+//    }
+//
+//}
+
+
+//    public static boolean checkParenthesies(String input) {
+//        Stack<Character> stack = new Stack<Character>();
+//        for (int i = 0; i < input.length(); i++) {
+//            char c = input.charAt(i);
+//            if (c == '[' || c == '(' || c == '{') {
+//                stack.push(c);
+//            }
+//        }
+//    }

src/test/java/io/zipcoder/ParenCheckerTest.java

@@ -3,6 +3,114 @@
 import org.junit.Assert;
 import org.junit.Test;
 
+import java.util.Stack;
+
+
 public class ParenCheckerTest {
 
+    @Test
+    public void parenthesisCheckerTest() {
+        //Given
+        ParenChecker parenthesisTest = new ParenChecker();
+
+        //When
+        String testString = "()";
+        boolean actual = parenthesisTest.parenChecker(testString);
+
+        //Then
+        Assert.assertTrue(actual);
+    }
+
+    @Test
+    public void parenthesisCheckerTest2() {
+        //Given
+        ParenChecker parenthesisTest = new ParenChecker();
+
+        //When
+        String testString2 = "()(";
+        boolean actual = parenthesisTest.parenChecker(testString2);
+
+        //Then
+        Assert.assertFalse(actual);
+    }
+    @Test
+    public void parenthesisCheckerTest3() {
+        //Given
+        ParenChecker parenthesisTest = new ParenChecker();
+
+        //When
+        String testString3 = "(i)p(";
+        boolean actual = parenthesisTest.parenChecker(testString3);
+
+        //Then
+        Assert.assertFalse(actual);
+    }
+
+    @Test
+    public void parenthesisCheckerTest4() {
+        //Given
+        ParenChecker parenthesisTest = new ParenChecker();
+
+        //When
+        String testString4 = "a(ki)loop(jj)hi";
+        boolean actual = parenthesisTest.parenChecker(testString4);
+
+        //Then
+        Assert.assertTrue(actual);
+    }
+
+
+    @Test
+    public void pairCheckerTest1() {
+        //Given
+        ParenChecker parenthesisTest = new ParenChecker();
+
+
+        //When
+        String testString2 = ")()(";
+        boolean actual = parenthesisTest.pairOfParenthesies(testString2);
+
+        //Then
+        Assert.assertFalse(actual);
+    }
+
+    @Test
+    public void pairCheckerTest2() {
+        //Given
+        ParenChecker parenthesisTest = new ParenChecker();
+
+        //When
+        String testString = "[]<>";
+        boolean actual = parenthesisTest.pairOfParenthesies(testString);
+
+        //Then
+        Assert.assertTrue(actual);
+    }
+
+    @Test
+    public void pairCheckerTest3() {
+        //Given
+        ParenChecker parenthesisTest = new ParenChecker();
+
+
+        //When
+        String testString3 = "atom)p(min)low(da";
+        boolean actual = parenthesisTest.pairOfParenthesies(testString3);
+
+        //Then
+        Assert.assertFalse(actual);
+    }
+
+    @Test
+    public void pairCheckerTest4() {
+        //Given
+        ParenChecker parenthesisTest = new ParenChecker();
+
+        //When
+        String testString4 = "do[re]mi<fig>aro";
+        boolean actual = parenthesisTest.pairOfParenthesies(testString4);
+
+        //Then
+        Assert.assertTrue(actual);
+    }
 }