1 public class Phone {
 2 
 3     private String cpu;
 4     private String screen;
 5     private String memory;
 6     private String mainboard;
 7 
 8     //私有构造方法
 9     private Phone(Builder builder) {
10         this.cpu = builder.cpu;
11         this.screen = builder.screen;
12         this.memory = builder.memory;
13         this.mainboard = builder.mainboard;
14     }
15 
16     @Override
17     public String toString() {
18         return "Phone{" +
19                 "cpu='" + cpu + '\'' +
20                 ", screen='" + screen + '\'' +
21                 ", memory='" + memory + '\'' +
22                 ", mainboard='" + mainboard + '\'' +
23                 '}';
24     }
25 
26     public static final class Builder {
27         private String cpu;
28         private String screen;
29         private String memory;
30         private String mainboard;
31 
32         public Builder cpu(String cpu) {
33             this.cpu = cpu;
34             return this;
35         }
36 
37         public Builder screen(String screen) {
38             this.screen = screen;
39             return this;
40         }
41         public Builder memory(String memory) {
42             this.memory = memory;
43             return this;
44         }
45         public Builder mainboard(String mainboard) {
46             this.mainboard = mainboard;
47             return this;
48         }
49 
50         //使用构建者创建Phone对象
51         public Phone build() {
52             return new Phone(this);
53         }
54     }
55 }

 

public class Client {
    public static void main(String[] args) {
        //创建手机对象   通过构建者对象获取手机对象
        Phone phone = new Phone.Builder()
                .cpu("intel")
                .screen("三星屏幕")
                .memory("金士顿内存条")
                .mainboard("华硕主板")
                .build();

        System.out.println(phone);
    }
}