匿名内部类

interface  command
{
    public abstract int process(int[] a);
}
public class CommandTest
{
    int[] target = {1,2,3,4};
    public void process(int[] a,command c)
    {
        System.out.println("元素之和是"+c.process(target));
    }
    public static void main(String[] args)
    {
        CommandTest ct = new CommandTest();
        int[] target = {1,2,3,4};
        ct.process(target,new command()
        {
            public int process(int[] a)
            {
                int sum = 0;
                for(int tmp:a)
                {
                        sum += tmp;
                }
                return sum;
            }
        });
    }
}