增加了对遍历器模式的解析讲解

Author: askrain

src/com/company/iteratorPattern/demo/Boss.java

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+package com.company.iteratorPattern.demo;
+
+public class Boss {
+    public static void main(String[] args) {
+        CompanyDevelop develop = new CompanyDevelop();
+        check(develop.iterator());
+
+        CompanyTester tester = new CompanyTester();
+        check(tester.iterator());
+
+    }
+
+
+    private static void check(Iterator iterator) {
+        while (iterator.hasNext()) {
+            System.out.println(iterator.next().toString());
+        }
+    }
+}

src/com/company/iteratorPattern/demo/Company.java

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+package com.company.iteratorPattern.demo;
+
+//容器类接口，主要是定义一个可以返回容器迭代器的方法
+public interface Company {
+    Iterator<Employee> iterator();
+}

src/com/company/iteratorPattern/demo/CompanyDevelop.java

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+package com.company.iteratorPattern.demo;
+
+import java.util.ArrayList;
+import java.util.List;
+
+
+//开发对应的容器类
+public class CompanyDevelop implements Company {
+
+    List<Employee> list = new ArrayList<>();
+
+    public CompanyDevelop() {
+        list.add(new Employee("小明", 21, "男", "安卓开发"));
+        list.add(new Employee("晨晨", 18, "女", "H5"));
+        list.add(new Employee("朔风", 19, "男", "JS"));
+        list.add(new Employee("糖心", 25, "男", "技术管理"));
+    }
+
+    public List<Employee> getEmployees() {
+        return list;
+    }
+
+    @Override
+    public Iterator<Employee> iterator() {
+        return new DevelopIterator(list);
+    }
+}

src/com/company/iteratorPattern/demo/CompanyTester.java

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+package com.company.iteratorPattern.demo;
+
+
+public class CompanyTester implements Company {
+    private Employee[] array = new Employee[3];
+
+    public CompanyTester() {
+        array[0] = new Employee("辉哥", 12, "男", "初级测试");
+        array[1] = new Employee("小红", 25, "女", "高级测试");
+        array[0] = new Employee("辉总", 35, "男", "测试管理");
+    }
+
+    @Override
+    public Iterator<Employee> iterator() {
+        return new TestIterator(array);
+    }
+
+    public Employee[] getEmployees() {
+        return array;
+    }
+}

src/com/company/iteratorPattern/demo/DevelopIterator.java

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+package com.company.iteratorPattern.demo;
+
+
+import java.util.List;
+
+public class DevelopIterator implements Iterator {
+    private List<Employee> list;
+    private int position;
+
+    public DevelopIterator(List<Employee> list) {
+        this.list = list;
+    }
+
+    @Override
+    public boolean hasNext() {
+        return !(position > list.size() - 1 || list.get(position) == null);
+    }
+
+    @Override
+    public Object next() {
+        Employee employee = list.get(position);
+        position++;
+        return employee;
+    }
+}

src/com/company/iteratorPattern/demo/Employee.java

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+package com.company.iteratorPattern.demo;
+
+public class Employee {
+    private String name;
+    private int age;
+    private String sex;
+    private String position;
+
+    public Employee(String name, int age, String sex, String position) {
+        this.name = name;
+        this.age = age;
+        this.sex = sex;
+        this.position = position;
+    }
+
+    @Override
+    public String toString() {
+        return "Employee{" +
+                "name='" + name + '\'' +
+                ", age=" + age +
+                ", sex='" + sex + '\'' +
+                ", position='" + position + '\'' +
+                '}';
+    }
+}

src/com/company/iteratorPattern/demo/Iterator.java

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+package com.company.iteratorPattern.demo;
+
+public interface Iterator<T> {
+    boolean hasNext();
+
+    T next();
+
+}

src/com/company/iteratorPattern/demo/TestIterator.java

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+package com.company.iteratorPattern.demo;
+
+public class TestIterator implements Iterator {
+
+    private Employee[] array;
+    private int position;
+
+    public TestIterator(Employee[] array) {
+        this.array = array;
+    }
+
+    @Override
+    public boolean hasNext() {
+        return !(position > array.length || array[position] == null);
+    }
+
+    @Override
+    public Object next() {
+        Employee employee = array[position];
+        position++;
+        return employee;
+    }
+}

src/com/company/iteratorPattern/model/Aggregate.java

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+package com.company.iteratorPattern.model;
+
+
+//容器接口
+public interface Aggregate<T> {
+
+    void add(T obj);
+
+    void remove(T obj);
+
+    Iterator<T> iterator();//获取迭代器对象
+}

src/com/company/iteratorPattern/model/Client.java

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+package com.company.iteratorPattern.model;
+
+
+//客户类
+public class Client {
+    public static void main(String[] args) {
+        Aggregate<String> a = new ConcreteAggregate<>();
+        a.add("Aige");
+        a.add("Studio\n");
+        a.add("SM");
+        a.add("brother");
+
+        Iterator<String> i = a.iterator();
+        while (i.hasNext()) {
+            System.out.println(i.next());
+        }
+
+    }
+}