3.2数组

例子3.3 声明一个整型数组并对他初始化，在屏幕上输出各元素的值与其总和。

public class IntArray
{
    public static void main (String args [])
    {
        int a [] = {1,2,6};
        int i, sum = 0;
        for (i = 0; i < a.length; i++)
            sum = sum + a[i];
        for (i = 0; i <a.length; i++)
            System.out.println("a ["+ i +"] = " + a[i]);
        System.out.println("sum= "+ sum);
    }
}

 

例子3.4 求一维数组的长度，并输出结果

public class ArrayLength
{
    public static void main (String [] args )
    {
        int a [] = {1,2,3,4,9};
        System.out.println ("length:" + a.length + "\n");
        for (int i = 0; i< a.length; i++)
            System.out.print (a [i]+ "　");
        a = new int [8];
        System.out.println ();
        System.out.println ("length:" + a.length + "\n");
        a [0] = 1;
        a [1] = 10;
        for (int i = 0; i < a.length; i++)
            System.out.print(a [i] + " "+ "\n");        
    }
}