自己寫的簡單的arraylist

--------------------------------------------題記

最近朋友有面試，叫我幫他根據需求寫一個類似arraylist的集合：remove、get、tostring、add和刪除後有空的位置後面的元素自動向前移。

---------------------------------------------代碼

package hxq;

public class Test {
	
	public static void main(String[] args) {
		myArrayList<String> list = new myArrayList<String>();
		list.add("1");
		list.add("2");
		
		System.out.println("list的toString：" + list.toString());
		
		System.out.println("list的第一個元素：" + list.get(0));
		
		System.out.println("list的size：" + list.size());
		
		System.out.println("刪除第一個元素");
		list.remove(0);
		
		System.out.println("list的第一個元素：" + list.get(0));
		
		System.out.println("list的size：" + list.size());
		
	}
	
}

class myArrayList<T> {
	
	private Object[] myArray;
	
	/**
	 * 增加
	 * @param ts 添加的對象
	 */
	public void add(T...ts) {
		addArrayLength();
		int len = myArray.length - 1;
		if (ts.length == 1) {
			myArray[len] = ts[0];
			return ;
		}
		myArray[len] = ts;
	}
	
	/**
	 * 集合大小
	 * @return 返回集合大小
	 */
	public int size() {
		return myArray.length;
	}
	
	/**
	 *  刪除集合
	 * @param index 刪除的索引
	 */
	public void remove(int index) {
		Object[] temps = new Object[myArray.length];
		int j = 0;
		for (int i = 0; i < myArray.length; i++) {
			if (i != index) {
				temps[j] = myArray[i];
				j++;
			}
		}
		
		reduceArrayLength();
		for (int i = 0; i < temps.length - 1; i++) {
			myArray[i] = temps[i];
		}
	}
	
	/**
	 * 重寫toString
	 */
	public String toString() {
		String str = "[";
		for (int i = 0; i < myArray.length; i++) {
			if (i > 0) {
				str += "," + myArray[i];
				continue;
			}
			str += myArray[i];
		}
		str += "]";
		
		return str;
	}
	
	@SuppressWarnings("unchecked")
	public T get(int index) {
		return (T) myArray[index];
	}
	
	//utils---------------------------------
	private void addArrayLength() {
		if (myArray == null) {
			myArray = new Object[1];
			return ;
		}
		Object[] objs = new Object[myArray.length + 1];
		for (int i = 0; i < myArray.length; i++) {
			objs[i] = myArray[i];
		}
		myArray = objs;
	}
	
	private void reduceArrayLength() {
		myArray = new Object[myArray.length - 1];
	}
	
}