first work

group14/254659936/.gitignore

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+*.iml
+.gradle
+.idea
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.externalNativeBuild

group14/254659936/src/Main.java

@@ -0,0 +1,7 @@
+
+public class Main {
+
+    public static void main(String[] args) {
+        System.out.println("Hello World!");
+    }
+}

group14/254659936/src/com/coding/basic/ArrayList.java

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+package com.coding.basic;
+
+import java.util.Objects;
+
+public class ArrayList implements List {
+
+    private int size = 0;
+
+    private Object[] elementData = new Object[5];
+
+    public void add(Object o) {
+        if (size == elementData.length) {
+            Object[] newArr = new Object[elementData.length * 2];
+            System.arraycopy(newArr, 0, elementData, 0, elementData.length);
+            elementData = newArr;
+        }
+        elementData[size] = o;
+        size++;
+    }
+
+    public void add(int index, Object o) {
+        if (index >= size) {
+            throw new RuntimeException("the ArrayList size is short than index");
+        }
+        elementData[index] = o;
+    }
+
+    public Object get(int index) {
+        if (index >= size) {
+            throw new RuntimeException("the ArrayList size is short than index");
+        }
+        return elementData[index];
+    }
+
+    public Object remove(int index) {
+        if (index >= size) {
+            throw new RuntimeException("the ArrayList size is short than index");
+        }
+        Object resultObj = elementData[index];
+        size--;
+        for (int i = index; i < size; i++) {
+            elementData[index] = elementData[index + 1];
+        }
+        return resultObj;
+    }
+
+    public int size() {
+        return size;
+    }
+
+    public Iterator iterator() {
+        return null;
+    }
+
+    private class ArrayIterator implements Iterator {
+
+        private int iteratorIndex = 0;
+
+        @Override
+        public boolean hasNext() {
+            return iteratorIndex < size;
+        }
+
+        @Override
+        public Object next() {
+            if (iteratorIndex >= size) {
+                throw new RuntimeException("the index is out of the list");
+            }
+            return elementData[iteratorIndex++];
+        }
+    }
+
+}

group14/254659936/src/com/coding/basic/BinaryTreeNode.java

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+package com.coding.basic;
+
+public class BinaryTreeNode<T extends BinaryTreeNode.Compare> {
+
+    private T data;
+    private BinaryTreeNode left;
+    private BinaryTreeNode right;
+
+    public T getData() {
+        return data;
+    }
+
+    public void setData(T 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(T o) {
+        BinaryTreeNode node = new BinaryTreeNode();
+        node.setData(o);
+        insert(this, node);
+        return node;
+    }
+
+    private void insert(BinaryTreeNode parent, BinaryTreeNode child) {
+        BinaryTreeNode node;
+        if (child.getData().isLargeThanTarget(parent.getData())) {
+            // 子节点比父节点大，需要向右插入
+            node = getRight();
+            if (null == node) {
+                // 右节点为空则可以直接插入
+                parent.setRight(node);
+            } else {
+                // 递归检查右边子树的插入位置
+                insert(node, child);
+            }
+        } else {
+            // 子节点比父节点小，或者等于父节点，需要向左插入
+            node = getLeft();
+            if (null == node) {
+                // 左节点为空，则直接插入
+                parent.setLeft(node);
+            } else {
+                // 递归检查左子树的插入位置
+                insert(node, child);
+            }
+        }
+    }
+
+    public interface Compare {
+        boolean isLargeThanTarget(Compare target);
+    }
+
+}

group14/254659936/src/com/coding/basic/Iterator.java

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

group14/254659936/src/com/coding/basic/LinkedList.java

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+package com.coding.basic;
+
+public class LinkedList implements List {
+
+    private Node head;
+    private int size = 0;
+
+    public void add(Object o) {
+        addLast(o);
+    }
+
+    public void add(int index, Object o) {
+        if (index >= size) {
+            throw new RuntimeException("the LinkedList size is short than index");
+        }
+        Node node = new Node();
+        node.data = 0;
+        if (index == 0) {
+            node.next = head;
+            head = node;
+        }
+        Node next = head;
+        int i = 0;
+        while (null != next) {
+            i++;
+            if (index == i) {
+                node.next = next.next;
+                next.next = node;
+                break;
+            }
+            next.next = next.next;
+        }
+        size++;
+    }
+
+    public Object get(int index) {
+        if (index >= size) {
+            throw new RuntimeException("the LinkedList size is short than index");
+        }
+        Node next = head;
+        int i = 0;
+        while (null != next) {
+            if (i == index) {
+                return next;
+            }
+            next = next.next;
+            i++;
+        }
+        return null;
+    }
+
+    public Object remove(int index) {
+        if (index >= size) {
+            throw new RuntimeException("the LinkedList size is short than index");
+        }
+        size--;
+        Node resultNode = null;
+        if (index == 0) {
+            resultNode = head;
+            head = head.next;
+            return resultNode.data;
+        }
+
+        Node next = head;
+        int i = 0;
+        while (null != next) {
+            if (i == index) {
+                resultNode = next.next;
+                next.next = resultNode.next;
+            }
+        }
+        return resultNode.data;
+    }
+
+    public int size() {
+        return size;
+    }
+
+    public void addFirst(Object o) {
+        size++;
+        Node node = new Node();
+        node.data = 0;
+        node.next = head;
+        head = node;
+    }
+
+    public void addLast(Object o) {
+        size++;
+        Node node = new Node();
+        node.data = o;
+        if (null == head) {
+            head = node;
+            return;
+        }
+        Node next = head;
+        while (null != next.next) {
+            next = next.next;
+        }
+        next.next = node;
+    }
+
+    public Object removeFirst() {
+        if (size == 0) {
+            throw new RuntimeException("the LinkedList is null");
+        }
+        size--;
+        Object obj = head.data;
+        head = head.next;
+        return obj;
+    }
+
+    public Object removeLast() {
+        if (size == 0) {
+            throw new RuntimeException("the LinkedList is null");
+        }
+        Node next = head;
+        Object obj = null;
+        for (int i = 0; i < size - 1; i++) {
+            next = next.next;
+        }
+        next.next = null;
+        size--;
+        return obj;
+    }
+
+    public Iterator iterator() {
+        return null;
+    }
+
+
+    private static class Node {
+        Object data;
+        Node next;
+    }
+
+    private class LinkedListIterator implements Iterator {
+
+        private Node next = head;
+
+        @Override
+        public boolean hasNext() {
+            return null != next;
+        }
+
+        @Override
+        public Object next() {
+            if (null == next) {
+                throw new RuntimeException("the LinkedList is out of index");
+            }
+            Object obj = next.data;
+            next = next.next;
+            return obj;
+        }
+    }
+}

group14/254659936/src/com/coding/basic/List.java

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+package com.coding.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();
+}

group14/254659936/src/com/coding/basic/Queue.java

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+package com.coding.basic;
+
+public class Queue {
+
+    private Node head;
+    private Node tail;
+    private int size;
+
+    public void enQueue(Object o) {
+        Node node = new Node();
+        node.data = o;
+        if (null == head) {
+            head = node;
+            tail = node;
+        } else {
+            tail.next = node;
+            tail = tail.next;
+        }
+        size++;
+    }
+
+    public Object deQueue() {
+        if (size <= 0) {
+            throw new RuntimeException("the queue is empty");
+        }
+        Object obj = head.data;
+        head = head.next;
+        size--;
+        return obj;
+    }
+
+    public boolean isEmpty() {
+        return size == 0;
+    }
+
+    public int size() {
+        return size;
+    }
+
+    private static class Node {
+        Object data;
+        Node next;
+        Node pre;
+    }
+}