classProduct { private String partA;//定义部件，部件可以是任意类型，包括值类型和引用类型 private String partB; private String partC;}abstract classBuilder{ //创建产品对象 protected Product product=newProduct(); public abstract void buildPartA(); public abstract void buildPartB(); public abstract void buildPartC(); //返回产品对象 public Product getResult(){ return product; }}classDirector{ private Builder builder; public Director(Builder builder){ this.builder=builder; } //管理控制产品构建与组装方法 publicProduct construct(){ builder.buildPartA(); builder.buildPartB(); builder.buildPartC(); return builder.getResult(); }}……Builder builder =newConcreteBuilder();//可以通过配置文件来存储具体建造者类ConcreteBuilder的类名，使得更换新的建造者时无须修改源代码，系统扩展更为方便Director director =new Director(builder);Product product = director.construct();……
protectedvoid dialog(){ AlertDialog.Builder builder =newBuilder(Main.this); builder.setMessage("确认退出吗？"); builder.setTitle("提示"); builder.setPositiveButton("确认",newOnClickListener(){ @Override publicvoid onClick(DialogInterface dialog,int which){ dialog.dismiss(); Main.this.finish(); } }); builder.setNegativeButton("取消",newOnClickListener(){ @Override publicvoid onClick(DialogInterface dialog,int which){ dialog.dismiss(); } }); builder.create().show();}原文：http://www.cnblogs.com/Doing-what-I-love/p/5621188.html