feat: Builder模式

src/cn/sp/builder/Person.java

@@ -0,0 +1,60 @@
+package cn.sp.builder;
+
+import java.util.Date;
+
+/**
+ * JavaBean模式
+ * Created by 2YSP on 2019/10/10.
+ */
+public class Person {
+
+  private int age;
+
+  private String name;
+
+  private Date birthday;
+
+  private String sex;
+
+  private String phone;
+
+  public int getAge() {
+    return age;
+  }
+
+  public void setAge(int age) {
+    this.age = age;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public Date getBirthday() {
+    return birthday;
+  }
+
+  public void setBirthday(Date birthday) {
+    this.birthday = birthday;
+  }
+
+  public String getSex() {
+    return sex;
+  }
+
+  public void setSex(String sex) {
+    this.sex = sex;
+  }
+
+  public String getPhone() {
+    return phone;
+  }
+
+  public void setPhone(String phone) {
+    this.phone = phone;
+  }
+}

src/cn/sp/builder/Person2.java

@@ -0,0 +1,42 @@
+package cn.sp.builder;
+
+import java.util.Date;
+
+/**
+ * 重叠构造器模式
+ * Created by 2YSP on 2019/10/10.
+ */
+public class Person2 {
+
+  private int age;
+
+  private String name;
+
+  private Date birthday;
+
+  private String sex;
+
+  private String phone;
+
+
+  public Person2(String name,Date birthday){
+    this.Person2(name,birthday,18);
+  }
+
+  public void Person2(String name, Date birthday, int age) {
+    this.Person2(name,birthday,age,"man");
+  }
+
+  public void Person2(String name, Date birthday, int age, String sex) {
+    this.Person2(name,birthday,age,sex,"110");
+  }
+
+  public void Person2(String name, Date birthday, int age, String sex, String phone) {
+    this.name = name;
+    this.birthday = birthday;
+    this.age = age;
+    this.sex = sex;
+    this.phone = phone;
+  }
+
+}

src/cn/sp/builder/Person3.java

@@ -0,0 +1,73 @@
+package cn.sp.builder;
+
+import java.util.Date;
+
+/**
+ * Builder模式可读性好，更加灵活
+ * Created by 2YSP on 2019/10/10.
+ */
+public class Person3 {
+
+  private final int age;
+
+  private final String name;
+
+  private final Date birthday;
+
+  private final String sex;
+
+  private final String phone;
+
+  private Person3(Builder builder) {
+    age = builder.age;
+    name = builder.name;
+    birthday = builder.birthday;
+    sex = builder.sex;
+    phone = builder.phone;
+  }
+
+
+  public static class Builder{
+    // required paramter
+    private final String name;
+
+    private final Date birthday;
+
+    // optional value
+    private  int age;
+
+    private String sex;
+
+    private String phone;
+
+    public Builder(String name,Date birthday){
+      this.name = name;
+      this.birthday = birthday;
+    }
+
+    public Builder age(int age){
+      this.age = age;
+      return this;
+    }
+
+    public Builder sex(String sex){
+      this.sex = sex;
+      return this;
+    }
+
+    public Builder phone(String phone){
+      this.phone = phone;
+      return this;
+    }
+
+    public Person3 build(){
+      return new Person3(this);
+    }
+  }
+
+
+  public static void main(String[] args) {
+    Person3 person3 = new Builder("张三",new Date()).age(18).sex("女").phone("110").build();
+    System.out.println(person3);
+  }
+}