Merge pull request #6 from eloiseSJTU/dev

finish basic data structures, pass all unit tests

group02/851113375/.gitignore

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+/bin/
+.classpath
+.project

group02/851113375/src/com/github/eloiseSJTU/coding2017/basic/ArrayList.java

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+
+package com.github.eloiseSJTU.coding2017.basic;
+
+import java.util.Arrays;
+import java.util.NoSuchElementException;
+
+public class ArrayList implements List {
+
+	private int size = 0;
+
+	private Object[] elementData = new Object[100];
+
+	public void add(Object o) {
+		ensureCapacity(size + 1);
+
+		elementData[size++] = o;
+	}
+
+	public void add(int index, Object o) {
+		checkBoundsForAdd(index);
+
+		ensureCapacity(size + 1);
+
+		if (index < size) {
+			System.arraycopy(elementData, index, elementData, index + 1, size - index);
+		}
+		elementData[index] = o;
+		size++;
+	}
+
+	public Object get(int index) {
+		checkBounds(index);
+
+		return elementData[index];
+	}
+
+	public Object remove(int index) {
+		checkBounds(index);
+
+		Object o = elementData[index];
+		System.arraycopy(elementData, index + 1, elementData, index, size - index - 1);
+		elementData[--size] = null;
+		return o;
+	}
+
+	public int size() {
+		return size;
+	}
+
+	public Iterator iterator() {
+		return new Itr();
+	}
+
+	private class Itr implements Iterator {
+
+		private int cur;
+
+		@Override
+		public boolean hasNext() {
+			return cur != size;
+		}
+
+		@Override
+		public Object next() {
+			if (cur >= size) {
+				throw new NoSuchElementException();
+			}
+			return elementData[cur++];
+		}
+
+	}
+
+	private void ensureCapacity(int capacity) {
+		if (capacity > elementData.length) {
+			capacity = elementData.length << 1;
+			elementData = Arrays.copyOf(elementData, capacity);
+		}
+	}
+
+	private void checkBounds(int index) {
+		if (index < 0 || index >= size) {
+			throw new IndexOutOfBoundsException();
+		}
+	}
+
+	private void checkBoundsForAdd(int index) {
+		if (index < 0 || index > size) {
+			throw new IndexOutOfBoundsException();
+		}
+	}
+}

group02/851113375/src/com/github/eloiseSJTU/coding2017/basic/BinaryTreeNode.java

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+package com.github.eloiseSJTU.coding2017.basic;
+
+public class BinaryTreeNode {
+
+	private Integer data;
+	private BinaryTreeNode left;
+	private BinaryTreeNode right;
+
+	public BinaryTreeNode() {}
+
+	public BinaryTreeNode(Integer data, BinaryTreeNode left, BinaryTreeNode right) {
+		this.data = data;
+		this.left = left;
+		this.right = right;
+	}
+
+	public Integer getData() {
+		return data;
+	}
+
+	public void setData(Integer data) {
+		this.data = data;
+	}
+
+	public BinaryTreeNode getLeft() {
+		return left;
+	}
+
+	public void setLeft(BinaryTreeNode left) {
+		this.left = left;
+	}
+
+	public BinaryTreeNode getRight() {
+		return right;
+	}
+
+	public void setRight(BinaryTreeNode right) {
+		this.right = right;
+	}
+
+	public BinaryTreeNode insert(Integer o) {
+		if (data == null) {
+			data = o;
+		} else {
+			if (o < data) {
+				if (left == null) {
+					left = new BinaryTreeNode(o, null, null);
+				} else {
+					left = left.insert(o);
+				}
+			} else {
+				if (right == null) {
+					right = new BinaryTreeNode(o, null, null);
+				} else {
+					right = right.insert(o);
+				}
+			}
+		}
+		return this;
+	}
+
+	public void print() {
+		if (left != null) {
+			left.print();
+		}
+		System.out.println(data);
+		if (right != null) {
+			right.print();
+		}
+	}
+
+}

group02/851113375/src/com/github/eloiseSJTU/coding2017/basic/Iterator.java

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+package com.github.eloiseSJTU.coding2017.basic;
+
+public interface Iterator {
+	public boolean hasNext();
+	public Object next();
+}

group02/851113375/src/com/github/eloiseSJTU/coding2017/basic/LinkedList.java

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+package com.github.eloiseSJTU.coding2017.basic;
+
+import java.util.NoSuchElementException;
+
+public class LinkedList implements List {
+
+	private int size = 0;
+
+	private Node head;
+
+	public void add(Object o) {
+		addLast(o);
+	}
+
+	public void add(int index, Object o) {
+		checkBoundsForAdd(index);
+
+		if (index == 0) {
+			addFirst(o);
+		} else if (index == size) {
+			addLast(o);
+		} else {
+			Node cur = head;
+			while (--index > 0) {
+				cur = cur.next;
+			}
+			Node newNode = new Node(o, cur.next);
+			cur.next = newNode;
+			size++;
+		}
+	}
+
+	public Object get(int index) {
+		checkBounds(index);
+
+		Node cur = head;
+		while (index-- > 0) {
+			cur = cur.next;
+		}
+		return cur.data;
+	}
+
+	public Object remove(int index) {
+		checkBounds(index);
+
+		if (index == 0) {
+			return removeFirst();
+		} else if (index == size - 1) {
+			return removeLast();
+		} else {
+			Node cur = head;
+			int i = 0;
+			while (++i < index) {
+				cur = cur.next;
+			}
+			Node node = cur.next;
+			Object o = node.data;
+			cur.next = node.next;
+			node.data = null;
+			node.next = null;
+			size--;
+			return o;
+		}
+	}
+
+	public int size() {
+		return size;
+	}
+
+	public void addFirst(Object o) {
+		Node newNode = new Node(o, head);
+		head = newNode;
+		size++;
+	}
+
+	public void addLast(Object o) {
+		Node newNode = new Node(o, null);
+		if (head == null) {
+			head = newNode;
+		} else {
+			Node cur = head;
+			while (cur.next != null) {
+				cur = cur.next;
+			}
+			cur.next = newNode;
+		}
+		size++;
+	}
+
+	public Object removeFirst() {
+		if (head == null) {
+			throw new NoSuchElementException();
+		}
+
+		Object o = head.data;
+		Node node = head.next;
+		head.data = null;
+		head.next = null;
+		head = node;
+		size--;
+		return o;
+	}
+
+	public Object removeLast() {
+		if (head == null) {
+			throw new NoSuchElementException();
+		}
+
+		if (head.next == null) {
+			return removeFirst();
+		}
+
+		Node cur = head;
+		int index = 0;
+		while (++index < size - 1) {
+			cur = cur.next;
+		}
+		Object o = cur.next.data;
+		cur.next.data = null;
+		cur.next = null;
+		size--;
+		return o;
+	}
+
+	public Iterator iterator() {
+		return new Itr();
+	}
+
+	private class Itr implements Iterator {
+
+		private Node cur = head;
+
+		@Override
+		public boolean hasNext() {
+			return cur != null;
+		}
+
+		@Override
+		public Object next() {
+			if (cur == null) {
+				throw new NoSuchElementException();
+			}
+			Object o = cur.data;
+			cur = cur.next;
+			return o;
+		}
+
+	}
+
+	private static class Node {
+		Object data;
+		Node next;
+		public Node(Object data, Node next) {
+			this.data = data;
+			this.next = next;
+		}
+	}
+
+	private void checkBounds(int index) {
+		if (index < 0 || index >= size) {
+			throw new IndexOutOfBoundsException();
+		}
+	}
+
+	private void checkBoundsForAdd(int index) {
+		if (index < 0 || index > size) {
+			throw new IndexOutOfBoundsException();
+		}
+	}
+}

group02/851113375/src/com/github/eloiseSJTU/coding2017/basic/List.java

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+package com.github.eloiseSJTU.coding2017.basic;
+
+public interface List {
+	public void add(Object o);
+
+	public void add(int index, Object o);
+
+	public Object get(int index);
+
+	public Object remove(int index);
+
+	public int size();
+
+	public Iterator iterator();
+}

group02/851113375/src/com/github/eloiseSJTU/coding2017/basic/Queue.java

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+package com.github.eloiseSJTU.coding2017.basic;
+
+public class Queue {
+
+	private int size = 0;
+
+	private LinkedList elementData = new LinkedList();
+
+	public void enQueue(Object o) {
+		elementData.addLast(o);
+		size++;
+	}
+
+	public Object deQueue() {
+		Object o = elementData.get(0);
+		elementData.removeFirst();
+		size--;
+		return o;
+	}
+
+	public boolean isEmpty() {
+		return size == 0;
+	}
+
+	public int size() {
+		return size;
+	}
+}