学步园

public class Array
{

               public static void main(String[] args)
           {
                  int[] a = new int [4];
                  a[0] = 1;
                  a[1] = 2;
                  a[2] = 3;
                  a[3] = 4;
               System.out.println(a[3]);
             }

}

// FOR循环

public class ArrayTest
{
               public static void main(String[] args)
           {
                    int[] a = new int[100];
                              for(int i = 0;i < a.length;i++)
                         {

                             a[i] = i+1;
                             System.out.println(a[i]);
                          }

           }
}