1 //数组 2 public class Test16{ 3 public static void main(String args[]){ 4 5 //声明一: 6 int [] x; 7 x = new int[3];//为数组申请内存空间,3个 8 x[0]=10; 9 x[1]=20; 10 x[2]=30; 11 //求数组的长度; 12 int len=x.length; 13 System.out.println("变量x的长度:"+len); 14 15 //声明二: 16 int [] xx=new int[3];//定义一个数组并申请好内存空间 17 xx[0]=10; 18 xx[1]=100; 19 xx[2]=200; 20 21 //声明三: 22 int [] y=new int[]{10,20,30,40}; 23 //int len=x.length; 24 System.out.println("变量y的长度:"+y.length); 25 26 } 27 }