设计模式 - 单例 & 组合

public interface IPrintable {
    void print();
}

public class Component implements IPrintable {
    public Component(String name){
        this.name = name;
    }
    private String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        String componentName = getClass().getSimpleName();
        System.out.println(String.format("print %s(%s)", componentName, name));
    }
}

public class Container extends Component {
    public Container(String name){
        super(name);
    }
    private List<Component> childList;
    public void addChild(Component component){
        if(childList == null){
            childList = new ArrayList<>();
        }
        childList.add(component);
    }
    @Override
    public void print() {
        super.print();
        if(childList == null || childList.size() == 0){
            return;
        }
        childList.stream().forEach(component -> {
            component.print();
        });
    }
}

public class WinForm extends Container {
    public WinForm(String name) {
        super(name);
    }
}
public class Frame extends Container {
    public Frame(String name) {
        super(name);
    }
}
public class Button extends Component {
    public Button(String name) {
        super(name);
    }
}
public class Label extends Component {
    public Label(String name) {
        super(name);
    }
}
public class CheckBox extends Component {
    public CheckBox(String name) {
        super(name);
    }
}
public class LinkLabel extends Component {
    public LinkLabel(String name) {
        super(name);
    }
}
public class PasswordBox extends Component {
    public PasswordBox(String name) {
        super(name);
    }
}
public class Picture extends Component {
    public Picture(String name) {
        super(name);
    }
}
public class TextBox extends Component {
    public TextBox(String name) {
        super(name);
    }
}

public static void main(String[] args){
        WinForm winForm = new WinForm("WINDOW窗口");
        winForm.addChild(new Picture("LOGO图片"));
        winForm.addChild(new Button("登陆"));
        winForm.addChild(new Button("注册"));
        Frame frame1 = new Frame("FRAME1");
        frame1.addChild(new Label("用户名"));
        frame1.addChild(new TextBox("文本框"));
        frame1.addChild(new TextBox("密码"));
        frame1.addChild(new PasswordBox("密码框"));
        frame1.addChild(new CheckBox("复选框"));
        frame1.addChild(new TextBox("记住用户名"));
        frame1.addChild(new LinkLabel("忘记密码"));
        winForm.addChild(frame1);
        winForm.print();
    }

print WinForm(WINDOW窗口)
print Picture(LOGO图片)
print Button(登陆)
print Button(注册)
print Frame(FRAME1)
print Label(用户名)
print TextBox(文本框)
print TextBox(密码)
print PasswordBox(密码框)
print CheckBox(复选框)
print TextBox(记住用户名)
print LinkLabel(忘记密码)