Composite Pattern

Description

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院校问题

//OrganizationComponent.java
public abstract class OrganizationComponent {
    private String name;
    private String description;

    protected void add(OrganizationComponent organizationComponent){
        //default
        throw new UnsupportedOperationException();
    }
    protected void remove(OrganizationComponent organizationComponent){
        //default
        throw new UnsupportedOperationException();
    }

    public OrganizationComponent(String name, String description) {
        this.name = name;
        this.description = description;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    protected abstract void print();

}

//University.java
import java.util.ArrayList;
import java.util.List;

public class University extends OrganizationComponent {
    // List中存放的是College
    List<OrganizationComponent> organizationComponents = new ArrayList<OrganizationComponent>();

    public University(String name, String description){
        super(name, description);
    }

    @Override
    protected void add(OrganizationComponent organizationComponent) {
        organizationComponents.add(organizationComponent);
    }

    @Override
    protected void remove(OrganizationComponent organizationComponent) {
        organizationComponents.remove(organizationComponent);
    }

    @Override
    public String getName() {
        return super.getName();
    }

    @Override
    public String getDescription() {
        return super.getDescription();
    }

    @Override
    protected void print() {
        System.out.println("----------" + getName() + "------------");
        for(OrganizationComponent list : organizationComponents){
            list.print();
        }
    }
}

//College.java
import java.util.ArrayList;
import java.util.List;

public class College extends OrganizationComponent{
    // List中存放的是 Department
    List<OrganizationComponent> organizationComponents = new ArrayList<OrganizationComponent>();

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

    @Override
    protected void add(OrganizationComponent organizationComponent) {
        organizationComponents.add(organizationComponent);
    }

    @Override
    protected void remove(OrganizationComponent organizationComponent) {
        organizationComponents.remove(organizationComponent);
    }

    @Override
    public String getName() {
        return super.getName();
    }

    @Override
    public String getDescription() {
        return super.getDescription();
    }

    @Override
    protected void print() {
        System.out.println("----------" + getName() + "------------");
        for(OrganizationComponent list : organizationComponents){
            list.print();
        }
    }
}

// Department.java
public class Department extends OrganizationComponent{

    public Department(String name, String description){
        super(name, description);
    }

    @Override
    public String getName() {
        return super.getName();
    }

    @Override
    public String getDescription() {
        return super.getDescription();
    }

    @Override
    protected void print() {
        System.out.println(getName());
    }
}

// Client.java
public class Client {
    public static void main(String[] args) {
        OrganizationComponent university = new University("Yale","Jerry");

        OrganizationComponent college1 = new College("CS", "Coding");
        OrganizationComponent college2 = new College("Pi", "Thinking");

        college1.add(new Department("SE","TOM"));
        college1.add(new Department("HU", "RI"));
        college1.add(new Department("TA","NR"));
        college2.add(new Department("TT", "JJ"));
        college2.add(new Department("FF", "EE"));
        college2.add(new Department("UU", "II"));

        university.add(college1);
        university.add(college2);
        university.print();
        college1.print();
        college2.print();
    }
    // The output
//    ----------Yale------------
//            ----------CS------------
//    SE
//            HU
//    TA
//----------Pi------------
//    TT
//            FF
//    UU
//----------CS------------
//    SE
//            HU
//    TA
//----------Pi------------
//    TT
//            FF
//    UU

}

Use in JDK

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Attention