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本篇內(nèi)容主要講解“Java過濾器模式怎么實(shí)現(xiàn)”,感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷,實(shí)用性強(qiáng)。下面就讓小編來帶大家學(xué)習(xí)“Java過濾器模式怎么實(shí)現(xiàn)”吧!
過濾器模式(Filter Pattern)或標(biāo)準(zhǔn)模式(Criteria Pattern)是一種設(shè)計(jì)模式,這種模式允許開發(fā)人員使用不同的標(biāo)準(zhǔn)來過濾一組對(duì)象,通過邏輯運(yùn)算以解耦的方式把它們連接起來。這種類型的設(shè)計(jì)模式屬于結(jié)構(gòu)型模式,它結(jié)合多個(gè)標(biāo)準(zhǔn)來獲得單一標(biāo)準(zhǔn)。
我們將創(chuàng)建一個(gè) Person 對(duì)象、Criteria 接口和實(shí)現(xiàn)了該接口的實(shí)體類,來過濾 Person 對(duì)象的列表。CriteriaPatternDemo,我們的演示類使用 Criteria 對(duì)象,基于各種標(biāo)準(zhǔn)和它們的結(jié)合來過濾 Person 對(duì)象的列表。
創(chuàng)建一個(gè)類,在該類上應(yīng)用標(biāo)準(zhǔn)。
Person.java public class Person { private String name; private String gender; private String maritalStatus; public Person(String name,String gender,String maritalStatus){ this.name = name; this.gender = gender; this.maritalStatus = maritalStatus; } public String getName() { return name; } public String getGender() { return gender; } public String getMaritalStatus() { return maritalStatus; } }
為標(biāo)準(zhǔn)(Criteria)創(chuàng)建一個(gè)接口。
Criteria.java import java.util.List; public interface Criteria { public List meetCriteria(List persons); }
創(chuàng)建實(shí)現(xiàn)了 Criteria 接口的實(shí)體類。
CriteriaMale.java import java.util.ArrayList; import java.util.List; public class CriteriaMale implements Criteria { @Override public List meetCriteria(List persons) { List malePersons = new ArrayList(); for (Person person : persons) { if(person.getGender().equalsIgnoreCase("MALE")){ malePersons.add(person); } } return malePersons; } } CriteriaFemale.java import java.util.ArrayList; import java.util.List; public class CriteriaFemale implements Criteria { @Override public List meetCriteria(List persons) { List femalePersons = new ArrayList(); for (Person person : persons) { if(person.getGender().equalsIgnoreCase("FEMALE")){ femalePersons.add(person); } } return femalePersons; } } CriteriaSingle.java import java.util.ArrayList; import java.util.List; public class CriteriaSingle implements Criteria { @Override public List meetCriteria(List persons) { List singlePersons = new ArrayList(); for (Person person : persons) { if(person.getMaritalStatus().equalsIgnoreCase("SINGLE")){ singlePersons.add(person); } } return singlePersons; } } AndCriteria.java import java.util.List; public class AndCriteria implements Criteria { private Criteria criteria; private Criteria otherCriteria; public AndCriteria(Criteria criteria, Criteria otherCriteria) { this.criteria = criteria; this.otherCriteria = otherCriteria; } @Override public List meetCriteria(List persons) { List firstCriteriaPersons = criteria.meetCriteria(persons); return otherCriteria.meetCriteria(firstCriteriaPersons); } } OrCriteria.java import java.util.List; public class OrCriteria implements Criteria { private Criteria criteria; private Criteria otherCriteria; public OrCriteria(Criteria criteria, Criteria otherCriteria) { this.criteria = criteria; this.otherCriteria = otherCriteria; } @Override public List meetCriteria(List persons) { List firstCriteriaItems = criteria.meetCriteria(persons); List otherCriteriaItems = otherCriteria.meetCriteria(persons); for (Person person : otherCriteriaItems) { if(!firstCriteriaItems.contains(person)){ firstCriteriaItems.add(person); } } return firstCriteriaItems; } }
使用不同的標(biāo)準(zhǔn)(Criteria)和它們的結(jié)合來過濾 Person 對(duì)象的列表。
CriteriaPatternDemo.java import java.util.ArrayList; import java.util.List; public class CriteriaPatternDemo { public static void main(String[] args) { List persons = new ArrayList(); persons.add(new Person("Robert","Male", "Single")); persons.add(new Person("John","Male", "Married")); persons.add(new Person("Laura","Female", "Married")); persons.add(new Person("Diana","Female", "Single")); persons.add(new Person("Mike","Male", "Single")); persons.add(new Person("Bobby","Male", "Single")); Criteria male = new CriteriaMale(); Criteria female = new CriteriaFemale(); Criteria single = new CriteriaSingle(); Criteria singleMale = new AndCriteria(single, male); Criteria singleOrFemale = new OrCriteria(single, female); System.out.println("Males: "); printPersons(male.meetCriteria(persons)); System.out.println("\nFemales: "); printPersons(female.meetCriteria(persons)); System.out.println("\nSingle Males: "); printPersons(singleMale.meetCriteria(persons)); System.out.println("\nSingle Or Females: "); printPersons(singleOrFemale.meetCriteria(persons)); } public static void printPersons(List persons){ for (Person person : persons) { System.out.println("Person : [ Name : " + person.getName() +", Gender : " + person.getGender() +", Marital Status : " + person.getMaritalStatus() +" ]"); } } }
執(zhí)行程序,輸出結(jié)果:
Males: Person : [ Name : Robert, Gender : Male, Marital Status : Single ] Person : [ Name : John, Gender : Male, Marital Status : Married ] Person : [ Name : Mike, Gender : Male, Marital Status : Single ] Person : [ Name : Bobby, Gender : Male, Marital Status : Single ] Females: Person : [ Name : Laura, Gender : Female, Marital Status : Married ] Person : [ Name : Diana, Gender : Female, Marital Status : Single ] Single Males: Person : [ Name : Robert, Gender : Male, Marital Status : Single ] Person : [ Name : Mike, Gender : Male, Marital Status : Single ] Person : [ Name : Bobby, Gender : Male, Marital Status : Single ] Single Or Females: Person : [ Name : Robert, Gender : Male, Marital Status : Single ] Person : [ Name : Diana, Gender : Female, Marital Status : Single ] Person : [ Name : Mike, Gender : Male, Marital Status : Single ] Person : [ Name : Bobby, Gender : Male, Marital Status : Single ] Person : [ Name : Laura, Gender : Female, Marital Status : Married ]
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