组合模式

设计模式 评论

组合模式

属于结构型模式

组合模式又叫部分整体模式,它创建了对象组的树形结构, 将对象组成树状结构来表示整体的层次关系

为什么使用组合模式

组合模式能够使用户对单个对象和组合对象的访问具有一致性

有时候功能的扩展对象可能是包含关系, 而不是继承关系, 需要使用组合模式

使用组合模式

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// 组织, 大学 学院 部门都继承组织
public abstract class Origanization {
    public Origanization(String name, String info) {
        this.name = name;
        this.info = info;
    }
    private String name;
    private String info;
    public void add(Origanization origanization){
        System.out.println("添加: "+origanization.name);
    }
    public void remove(Origanization origanization){
        System.out.println("移除: "+origanization.name);
    }
    public abstract void print();
    @Override
    public String toString() {
        return "Origanization{" +
                "name='" + name + '\'' +
                ", info='" + info + '\'' +
                '}';
    }
}

// 大学
public class University extends Origanization{
    // 管理学院
    List<Origanization> list=new ArrayList<>();
    @Override
    public void add(Origanization origanization) {
        list.add(origanization);
    }
    @Override
    public void remove(Origanization origanization) {
        list.remove(origanization);
    }
    public University(String name, String info) {
        super(name, info);
    }
    // 输出包含的学院
    @Override
    public void print() {
        System.out.println("----"+this+"----");
        for(Origanization origanization: list){
            origanization.print();
        }
    }
}

// 学院
public class College extends Origanization{
    //管理部门
    List<Origanization> list=new ArrayList<>();

    @Override
    public void add(Origanization origanization) {
        list.add(origanization);
    }

    @Override
    public void remove(Origanization origanization) {
        list.remove(origanization);
    }


    public College(String name, String info) {
        super(name, info);
    }

    @Override
    public void print() {
        System.out.println("--"+this+"--");
        for(Origanization origanization: list){
            origanization.print();
        }
    }
}

// 部门 叶子节点
public class Department extends Origanization{
    public Department(String name, String info) {
        super(name, info);
    }

    @Override
    public void print() {
        System.out.println(this);
    }
}

// 测试
@Test
public void testComposite(){
    Origanization university = new University("浙江大学","大学");
    Origanization college1 = new College("计算机学院","学院");
    Origanization college2 = new College("国际学院","学院");
    university.add(college1);
    university.add(college2);
    Origanization department1 = new Department("信息工程","部门");
    Origanization department2 = new Department("软件工程","部门");
    college1.add(department1);
    college1.add(department2);
    Origanization department3 = new Department("国际英语","部门");
    Origanization department4 = new Department("商务英语","部门");
    college2.add(department3);
    college2.add(department4);
    university.print();
}

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