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Commit1093a49

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Merge pull requestTheAlgorithms#717 from AnkitAtBrillio/local
Adding Stack implementation along with test class
2 parents822c91c +46df09a commit1093a49

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2 files changed

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2 files changed

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packagesrc.main.java.com.dataStructures;
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importjava.io.Serializable;
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importjava.util.EmptyStackException;
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publicclassStack<E>implementsSerializable {
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/**
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* Initial capacity allocated to stack on object creation
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*/
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privatefinalintINITIAL_CAPACITY =10;
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/**
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* Increment in memory space once stack is out of space
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*/
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privatefinalintEXTENDED_CAPACITY =10;
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/**
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* Position of tail in stack
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*/
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privateinttail = -1;
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/**
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* Size of stack at any given time
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*/
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privateintsize;
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/**
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* Uninitialized array to hold stack elements.
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* WIll be initialized with initial capacity once the object is created
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*/
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privateObject[]elements;
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/**
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* No argument to create stack object with initial capacity
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*/
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publicStack() {
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elements =newObject[INITIAL_CAPACITY];
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}
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/**
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* Method to check if the given stack is empty or not
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*/
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publicbooleanempty() {
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returnelements ==null ||size ==0;
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}
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/**
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* Method to check the element on head without removing it
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*/
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publicObjectpeek() {
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if (empty()) {
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thrownewEmptyStackException();
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}
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returnelements[tail];
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}
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/**
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* Method to remove the top element from stack
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*/
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publicObjectpop() {
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if (empty()) {
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thrownewEmptyStackException();
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}
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ObjectremovedElement =elements[tail];
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tail--;
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size--;
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returnremovedElement;
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}
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/**
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* Method to add element to stack
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*/
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publicObjectpush(Objecte) {
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booleanisSuccess =false;
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if (tail < (INITIAL_CAPACITY -1)) {
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tail++;
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elements[tail] =e;
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}else {
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Object[]extendedElements =newObject[INITIAL_CAPACITY +EXTENDED_CAPACITY];
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System.arraycopy(elements,0,extendedElements,0, (tail +1));
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elements =extendedElements;
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tail++;
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elements[tail] =e;
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}
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size++;
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returne;
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}
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/**
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* Method to search for an element in stack
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*/
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publicintsearch(Objecto) {
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intindex = -1;
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booleanfound =false;
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if (empty()) {
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return -1;
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}
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for (inti =0;i <size();i++) {
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if (elements[i] ==o) {
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index =i;
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found =true;
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break;
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}
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}
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if (found) {
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index =tail -index +1;
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}
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returnindex;
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}
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/**
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* Method to get size of stack
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*/
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publicintsize() {
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returnsize;
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}
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}
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packagesrc.test.java.com.dataStructures;
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importorg.junit.Assert;
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importorg.junit.Test;
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importsrc.main.java.com.dataStructures.Stack;
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importjava.util.EmptyStackException;
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publicclassStackTest {
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@Test
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publicvoidtestEmpty() {
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Stack<Integer>myStack =newStack<>();
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booleanisEmpty =myStack.empty();
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Assert.assertTrue(isEmpty);
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myStack.push(10);
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isEmpty =myStack.empty();
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Assert.assertFalse(isEmpty);
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}
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@Test(expected =EmptyStackException.class)
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publicvoidtestPeekWithoutElements() {
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Stack<Integer>myStack =newStack<>();
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myStack.peek();
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}
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@Test
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publicvoidtestPeekWithElements() {
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Stack<Integer>myStack =newStack<>();
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myStack.push(10);
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myStack.push(20);
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myStack.push(30);
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myStack.push(40);
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Assert.assertEquals(40,myStack.peek());
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}
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@Test(expected =EmptyStackException.class)
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publicvoidtestPopWithoutElements() {
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Stack<Integer>myStack =newStack<>();
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myStack.pop();
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}
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@Test
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publicvoidtestPopWithElements() {
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Stack<Integer>myStack =newStack<>();
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myStack.push(10);
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myStack.push(20);
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myStack.push(30);
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myStack.push(40);
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myStack.push(50);
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Assert.assertEquals(50,myStack.pop());
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}
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@Test
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publicvoidtestPushWithinInitialCapacity() {
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Stack<Integer>myStack =newStack<>();
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myStack.push(10);
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myStack.push(20);
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myStack.push(30);
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myStack.push(40);
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myStack.push(50);
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myStack.push(60);
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myStack.push(70);
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myStack.push(80);
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myStack.push(90);
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myStack.push(100);
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Assert.assertEquals(10,myStack.size());
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}
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@Test
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publicvoidtestPushOutsideInitialCapacity() {
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Stack<Integer>myStack =newStack<>();
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myStack.push(10);
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myStack.push(20);
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myStack.push(30);
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myStack.push(40);
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myStack.push(50);
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myStack.push(60);
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myStack.push(70);
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myStack.push(80);
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myStack.push(90);
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myStack.push(100);
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myStack.push(110);
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Assert.assertEquals(11,myStack.size());
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}
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@Test
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publicvoidtestSearchWithObjectUnavailable() {
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Stack<Integer>myStack =newStack<>();
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myStack.push(10);
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myStack.push(20);
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myStack.push(30);
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Assert.assertEquals(-1,myStack.search(50));
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}
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@Test
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publicvoidtestSearchWithObjectAvailable() {
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Stack<Integer>myStack =newStack<>();
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myStack.push(10);
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myStack.push(20);
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myStack.push(30);
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Assert.assertEquals(3,myStack.search(10));
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}
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}

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