自己打造一個ArrayList

MyList.java

package com.classes;

import java.io.IOException;

final public class MyList<T> extends MyArrayInterface<T>
{
    private Object[] ojValue  = null;
    private int USELength =0 ;
    public MyList()
    {
      this(2);
    }
    public MyList(int __longth__)
    {
        ojValue = new Object[__longth__];
    //  for(Object _o : ojValue)
    //  {
    //      _o = new Object();
    //  }

    }
    public void  insert(int indEx,T value) throws IOException
    {
        this.__TS__add(indEx, value);
    }
    private void __TS__add(int _wz,T _o) throws IOException
    {

        if((_wz >this.USELength&&_wz<this.ojValue.length)||(_wz>this.ojValue.length))
        {
            //System.err.println("=================forbid to do this=================");             
        }
        else if(_wz == this.USELength)
        {
            this.ojValue[_wz] = _o;
        }
        else
        {
            System.out.println("tr0");
            Object _ob = this.ojValue[_wz];
            this.ojValue[_wz] = _o;

            for(int i = this.USELength;i>_wz;i--)
            {
                 this.__move__inClass__private(i);
            }
            this.ojValue[_wz+1] = _ob;
            this.USELength +=1;
        }
    }
    private void  __move__inClass__private(int __x__)
    {
        if(__x__<this.ojValue.length)
        {
        this.ojValue[__x__] = this.ojValue[__x__ - 1];
        }
        else
        {
        this.__add__inCLASS__private(); 
        this.ojValue[__x__] = this.ojValue[__x__ - 1];
        }
    }
    private void __add__inCLASS__private()
    {
        Object[] _ls___ = new  Object[USELength+5];
        System.arraycopy(ojValue, 0, _ls___, 0, USELength);
        this.ojValue = _ls___;
        //System.out.println("use the up");
    }
    public void push_back(T __value__)
    {
        if(this.USELength<this.ojValue.length)
        {
        this.__push_BACK__inCLASS__private(__value__);
        }
        else 
        {        
        this.__add__inCLASS__private();     
        this.__push_BACK__inCLASS__private(__value__);
        //System.out.println("use the copy");
        }
    }
    final private void __push_BACK__inCLASS__private(T __value__)
    {
        this.ojValue[this.USELength] = __value__;
        this.USELength +=1;
    }
    public  void pop()
    {
        this.ojValue[this.USELength] = null;
        this.USELength -=1;
    }
    public void change(int _x,T _o)
    {
        if(_x<this.USELength)
        {
        this.ojValue[_x] = _o;
        }
        else 
        {
            //System.err.println("=================changeERROR=============");
        }
    }
    public void changeEachother(int _x ,int x_)
    {
        Object _OC = null;
        if(_x<this.USELength&&x_<this.USELength)
        {
        _OC = this.ojValue[_x];
        this.ojValue[_x] = this.ojValue[x_];
        this.ojValue[x_] = _OC;
        }
        else 
        {
            //System.err.println("=================changeEachotherERROR=================");
        }
    }
    public  T find(int _x) throws IOException
    {       
        if(_x>=this.USELength)
        {
            throw new IOException();
        }
        return (T)(this.ojValue[_x]);

    }
    public  int getLength()
    {
        return this.USELength;      
    }

    public String toString()
    {
        String _sUsingLedthIndexOverRideIng = new String();
        for(int i =0;i<this.USELength;i++)
        {
            _sUsingLedthIndexOverRideIng +=this.ojValue[i].toString()+",";

        }
     return _sUsingLedthIndexOverRideIng;
    }

}

MyArrayabs.JAVA

package com.classes;

import java.io.IOException;

public abstract class MyArrayInterface<T> implements interArrayFace<T>
{
    //public abstract void add(int _wz,T _o) throws IOException;
    public abstract void push_back(T __value__);
    public abstract void pop();
    public abstract T find(int _x) throws IOException;
    public abstract int getLength();
    public void run(int longs)
    {
        try
        {
            Thread.sleep(longs);
        } 
        catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

interArrayFace.java

package com.classes;

public interface interArrayFace<T> 
{
    public abstract void push_back(T __value__);
    public abstract void pop();
    public abstract int getLength();

}