使用基本数组类型创建可自扩展的数组类-优快云博客

public class ChenqiArray {

/**
* @param args
*/
public static void main(String[] args) {
  // TODO Auto-generated method stub
  RisingsoftArray raOne=new RisingsoftArray();
  int newLength=raOne.getArrayCount()+10;
  for(int i=0;i<newLength;i++){
   raOne.setItem(i,new Integer(i));
   System.out.println("raOne.items["+i+"]="+raOne.getItem(i));
  }
  newLength=raOne.getArrayCount()+5;
  for(int i=0;i<newLength;i++){
   raOne.setItem(i,new Integer(i));
   System.out.println("raOne.items["+i+"]="+raOne.getItem(i));
  }
  newLength=raOne.getArrayCount()+5;
  raOne.setItem(newLength-1,new Integer(newLength-1));
  for(int i=0;i<raOne.getArrayCount();i++){
   System.out.println("raOne.items["+i+"]="+raOne.getItem(i));
  }
}
}

class RisingsoftArray{
private Object[] obj;
//constructor
public RisingsoftArray(int ArrayLength){
  if(ArrayLength>=1){
   obj=new Object[ArrayLength];
  }
}
public RisingsoftArray(){
  this(0);
}
public RisingsoftArray(Object[] obj){
  this.obj=RisingsoftArray.cloneArray(obj);
}
//get the Array items count
    public int getArrayCount(){
    return (obj!=null)?obj.length:0;
    }
    //auto expand the Array and copy the items
    public void expandArray(int n){
    if(n>0 && n>getArrayCount()){
      Object[] newObj=new Object[n];
      for(int i=0;i<getArrayCount();newObj[i]=obj[i++]){}
      obj=newObj;
    }
    }
    //get access
    public Object getItem(int pos){
    return (pos>=0 && pos<getArrayCount())?obj[pos]:null;
    }
//set access
    public void setItem(int pos,Object obj){
    if(pos>=0 && pos<getArrayCount()){
      this.obj[pos]=obj;
    }
    else if (pos>0||(pos==getArrayCount())) {
      expandArray(pos+1);
      setItem(pos,obj);
    }
    }
//clone a Array
public static Object[] cloneArray(Object[] obj){
  if(obj.length<1){
   return null;
  }
  else{
   Object[] newObj=new Object[obj.length];
   for(int i=0;i<obj.length;newObj[i]=obj[i++]){}
   return newObj;
  }
}
}