java 数组（一）

public class ArrayDemo{
	public static void main(String[] args){
		//数组的定义  数据类型[] 数组名 = new 数据类型[数组个数]
		//第一种
		int[] arrInt0 = new int[5];
		System.out.println(arrInt0.length);//打印出数组的个数
		
		//第二种
		int[] arrInt1 = new int[]{1, 2, 3};
		System.out.println(arrInt1.length);
		
		//第三种
		int[] arrInt2 = {1, 2, 4, 6};
		System.out.println(arrInt2.length);
		
		//=======================================================
		//数组的取值
		int num = arrInt0[2];
		System.out.println(num);
		
		//=======================================================
		//数组的赋值
		arrInt0[2] = 8;
		System.out.println(arrInt0[2]);
	}
}