（Java）在数组的第i个坐标下中插入一个数据元素，并保持数组元素的连续性

package javaproject;
public class Test 
{
    public int[] insert(int[] a,int i,int data)
    {
            int len=a.length;    
            int[] temp=new int[len+1];
            for(int t=0;t<len;t++)
                temp[t]=a[t];
            if(i<0||i>len)
                return a;
            else
            {    
                try
                {
                for(int j=len;j>i;j--)
                {
                    temp[j]=temp[j-1];
                }
                temp[i]=data;
                }
                catch(ArrayIndexOutOfBoundsException e )
                {
                    System.out.println("数组越界");
                }
                return temp;
            }        
    }
        public static void main(String [] args)
        {
            // TODO Auto-generated method stub
            Test b = new Test();
            int a1[]={1,2,3,5,6,7};
            try{
            System.out.println("array a:"+a1[0]+" "+a1[1]+" "+a1[2]+" "+a1[3]+" "+a1[4]+" "+a1[5]);
            int temp[]=b.insert(a1, 3, 4);
            System.out.println("插入4到a[3]:"+temp[0]+" "+temp[1]+" "+temp[2]+" "+temp[3]+" "+temp[4]+" "+temp[5]+" "+temp[6]);
            }catch(ArrayIndexOutOfBoundsException e )
            {
                System.out.println("数组越界");
            }
        }    
}