构建者模式

Android系统中的AlertDialog.Buidler()就是构建者模式
实例代码:

/**
 * Create by pengQun 2021/2/25
 * Desc:  Builder设计模式
 */
public class IDialog {

    private static final String TAG = IDialog.class.getSimpleName();

    private String title;
    private String icon;
    private String content;

    private IDialog(Builder builder) {
        title = builder.getTitle();
        icon = builder.getIcon();
        content = builder.getContent();
    }

    public void show() {
        Log.d(TAG,"===> 显示dialog");
    }

    @Override
    public String toString() {
        return "IDialog{" +
                "title='" + title + '\'' +
                ", icon='" + icon + '\'' +
                ", content='" + content + '\'' +
                '}';
    }

    public static class Builder {

        private String title;
        private String icon;
        private String content;

        public String getTitle() {
            return title;
        }

        public Builder setTitle(String title) {
            this.title = title;
            return this;
        }

        public String getIcon() {
            return icon;
        }

        public Builder setIcon(String icon) {
            this.icon = icon;
            return this;
        }

        public String getContent() {
            return content;
        }

        public Builder setContent(String content) {
            this.content = content;
            return this;
        }

        public IDialog create() {
            return new IDialog(this);
        }
    }
}