数组问题


//动态分配数组
public class TestArray{
        static int index=4;            
        public static void main(String[] argv){
                int a[]={1,2,3,4};
                a=insert(a,2,5);
                a=delete(a,3);
                for(int i=0;i<a.length;i++){
                        System.out.println(a[i]);
                }
                System.out.println("index="+index);
        }
       //插入一个元素
       static int[] insert(int[] a,int pos,int value){
                if(index==a.length){
                        a=expand(a);
                }
                for(int i=index;i>=pos+1;i--){
                        a[i]=a[i-1];
                }
                a[pos]=value;
                index++;
                return a;
        }
        //扩充元素
        static int[] expand(int[] a){
                int[] b=new int[a.length*2];
                System.arraycopy(a,0,b,0,a.length);
                return b;
        }
       //删除元素
        static int[] delete(int[] a,int pos){
                for(int i=pos;i<=index-2;i++){
                        a[i]=a[i+1];
                }
                index--;
                return a;
        }
} 
其中
//扩充元素
        static int[] expand(int[] a){
                int[] b=new int[a.length*2];
                System.arraycopy(a,0,b,0,a.length);
                return b;
        }
b是一个函数内部的数组,局部的,能否返回,谢谢大家!!!!