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Composite

admin 11月 12, 2020 0

GoF Definition:

Compose objects into tree structures to represent part-whole hierarchies. The composite pattern lets clients treat individual objects and compositions of objects uniformly.

概念

组合模式，将对象组合成树形结构以表示部分-整体的层次结构，组合模式使得用户对单个对象和组合对象的使用具有一致性。

例子

任何树型数据结构都符合组合模式。

代码实现

public interface  {
    public String getDetails();
}

public class Teacher implements  {
    private String teacherName;
    private String deptName;
    private List<ITeacher> controls;

    Teacher(String teacherName, String deptName) {
        this.teacherName = teacherName;
        this.deptName = deptName;
        controls = new ArrayList<>();
    }

    public void add(Teacher teacher) {
        controls.add(teacher);
    }

    public void remove(Teacher teacher) {
        controls.remove(teacher);
    }

    public List<ITeacher> getControllingDepts() {
        return controls;
    }

    
    public String getDetails() {
        return teacherName + " is the " + deptName;
    }
}