接口：
==================package com.huaiwei.ben;public interface Filter {
public boolean doCheck( Object obj );}====================package com.huaiwei.ben;public interface Measure {
public double measure( Object obj);}========================package com.huaiwei.ben;public class Container {
public static final int Length=10000 ; private Object[ ] objs =new Object [Length]; private int count; private Object max; private Object min; private double avg; private double sum=0; private Filter filter; private Measure measure1; public Object[] getobjs(){ Object[] newobjs=new Object [count]; System.arraycopy( objs ,0,newobjs,0,count); //根据count来创建一个新数组 //System.out.arraycopy（）； return newobjs; } public void setFilter( Filter filter){ this .filter=filter; }public void setMeasure(Measure
measure1) { this.measure1 = measure1; objs= new Object[Length]; count=0; max=null; min=null; avg=0; sum=0; }public Object getMax() {
return max; }public Object getMin() {
return min; }public double getAvg() {
return avg; } public void save( Object obj){ //判断对象是否为空 if( obj==null){ return; } if( filter!=null){//判断接口是否 为空 if( !filter.doCheck( obj) ){ return; } } //判断当前数组是否为0，count〉=数 组。length //TODO：:将数组做成动态数组 if(count>objs.length){ System.out.println("容器 数组已满，无法操作！！"); return ; } //将这个obj这个数组放在数组里面 objs[count]=obj; double objvalue=measure1.measure(obj); if(count ==0) { max=obj; min=obj; }else{ double maxvalue=measure1.measure(max); double minvalue=measure1.measure(min); if(objvalue>maxvalue){ max=obj; } if( objvalue<minvalue){ min=obj; } } count++; sum+=objvalue; avg=sum/count;//调用measure.measure(obj)对obj
进行d }}============================以上是对com.huaiwei.ben的操作以下是对另一个包的操作；===============================package com.mimi.bean;public class Person {
private String name; private double height; private double weight; public Person(){ super(); }public Person(String name, double
height, double weight) { super(); this.name = name; this.height = height; this.weight = weight; }
public String getName() {
return name; }public void setName(String name) {
this.name = name; }public double getHeight() {
return height; }public void setHeight(double height) {
this.height = height; }public double getWeight() {
return weight; }public void setWeight(double weight) {
this.weight = weight; }}=================================package com.mimi.bean;import com.huaiwei.ben.Filter;
public class PersonBmiFilter implements Filter
{@Override
public boolean doCheck(Object obj) { if( obj == null ){ return false; } if( !( obj instanceof Person)){ return false; } Person p=(Person)obj; if( p.getWeight()>300 && p.getHeight()>30){ return false; } return true; }}==========================package com.mimi.bean;import com.huaiwei.ben.Measure;
public class PersonBmiTool implements Measure {
@Override
public double measure(Object obj) { if( obj ==null){ return 0; } if( !(obj instanceof Person) ){ return 0; } Person p=(Person)obj; double bmi=p.getWeight(); return bmi; }}
==============================测试类：import java.util.Random;import com.huaiwei.ben.Container;
import com.mimi.bean.Person;import com.mimi.bean.PersonBmiFilter;import com.mimi.bean.PersonBmiTool;public class Test {
/**
* @param args */ public static void main(String[] args) { Container c = new Container();PersonBmiFilter fl = new
PersonBmiFilter(); PersonBmiTool pbt = new PersonBmiTool();c.setMeasure(pbt);
c.setFilter(fl); Person p1 = new Person("张三", 433, 600); Person p2 = new Person("里斯", 1.333, 63); Person p3 = new Person("王五", 1.44, 95);c.save(p1);
c.save(p2); c.save(p3);/*
* Random r=new Random(); for( int i=0;i<100;i++){ Person p4=new * Person("王东 风"+i,1+Math.random(), r.nextInt(80)+30); * * c.save(p4); } */ Person max = (Person) c.getMax (); Person min = (Person) c.getMin ();System.out.println("最大值为" +
max.getName()); System.out.println("最小值" + min.getName());System.out.println("平均值" +
c.getAvg());Object[] objs = c.getobjs();
/*
* for(int i=0;i<2;i++){ Person p11=(Person)objs[i]; * System.out.println (p11.getName()); } */ for (Object o : objs) {// 增强型 的for，从objs中调用到Object o中 Person pp = (Person) o; System.out.println (pp.getName() + "\t" + pp.getHeight() + "\t" + pp.getWeight());}
System.out.println
("********************************");c.setFilter(null);
c.setMeasure(pbt);c.save(p1);
c.save(p2); c.save(p3); objs=c.getobjs();for (Object o : objs) {// 增强型
的for，从objs中调用到Object o中 Person pp = (Person) o; System.out.println (pp.getName() + "\t" + pp.getHeight() + "\t" + pp.getWeight());}
}
}