命令模式

public interface Command{void process(int[] target);}public class ProcessArray{public void process(int[] target,Command cmd){cmd.process(target);}}public class CommandTest{public static void main(){ProcessArray pa=new ProcessArray ();int[] target=new {1,2,3,4};pa.process(target,new PrintCommand());pa.process(target,new AddCommand());}}public class PrintCommand implements Command{public void process(int[] target){//..........}}public class AddCommand implements Command{public void process(int[] target){//..........}}

通过一个command接口让ProcessArray类和具体的 “处理行为分离”，只有等到调用ProcessArray的process方法时，传入一个真正的Command实例，才确定对数组的处理行为