建造者模式（Builder）

建造者模式（Builder）

特点：

在需要生成复杂内部结构时使用，即将多个简单的对象一步一步构建称为一个复杂对象。

构建方式（1）

新建Person.java类

public class Person {
    public int age;
    public String name;
    public String sex;
    public String address;
    public String born;

    @Override
    public String toString() {
        return "Person{" +
                "age=" + age +
                ", name='" + name + '\'' +
                ", sex='" + sex + '\'' +
                ", address='" + address + '\'' +
                ", born='" + born + '\'' +
                '}';
    }

    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 String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getBorn() {
        return born;
    }

    public void setBorn(String born) {
        this.born = born;
    }

}

新建构造（builder）类PersonBuilder .java

public class PersonBuilder {

    private Person mPerson;

    public PersonBuilder(){
        mPerson = new Person();
    }
    public PersonBuilder setAge(int age){
        mPerson.age = age;
        return this;
    }

    public PersonBuilder setName(String name){
        mPerson.name = name;
        return this;
    }

    public PersonBuilder setSex(String sex){
        mPerson.sex = sex;
        return this;
    }

    public PersonBuilder setAddress(String address){
        mPerson.address = address;
        return this;
    }

    public PersonBuilder setBorn(String born){
        mPerson.born = born;
        return this;
    }

    public Person create(){
        Log.i("msg", mPerson.toString());
        return mPerson;
    }

}

使用如下：

public void onClick(View view){
        PersonBuilder builder = new PersonBuilder();
        builder.setAge(20)
                .setName("张三")
                .setAddress("北京市")
                .setSex("男")
                .setBorn("厦门")
                .create();
        PersonBuilder builder1 = new PersonBuilder();
        builder1.setAge(22)
                .setName("李四")
                .setAddress("上海市")
                .setSex("女")
                .setBorn("福州")
                .create();
}

看到这里是不是与构建对话框与OKHTTP3类似呢？

构建方式（2）

新建Person.java类

public class Person {
    public int age;
    public String name;
    public String sex;
    public String address;
    public String born;

    @Override
    public String toString() {
        return "Person{" +
                "age=" + age +
                ", name='" + name + '\'' +
                ", sex='" + sex + '\'' +
                ", address='" + address + '\'' +
                ", born='" + born + '\'' +
                '}';
    }

    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 String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getBorn() {
        return born;
    }

    public void setBorn(String born) {
        this.born = born;
    }

}

Ibuilder.java

public interface Ibuilder {
    void setAge(int age);
    void setName(String name);
    void setAddress(String address);
    void setBorn(String born);
    void setSex(String sex);
}

ImplBuilder.java

public class ImplBuilder implements Ibuilder {

    private Person mPerson;

    public ImplBuilder(){
        mPerson = new Person();
    }

    @Override
    public void setAge(int age) {
        mPerson.setAge(age);
    }

    @Override
    public void setName(String name) {
        mPerson.setName(name);
    }

    @Override
    public void setAddress(String address) {
        mPerson.setAddress(address);
    }

    @Override
    public void setBorn(String born) {
        mPerson.setBorn(born);
    }

    @Override
    public void setSex(String sex) {
        mPerson.setSex(sex);
    }

    public Person create(){
        Log.i("msg", mPerson.toString());
        return mPerson;
    }

}

使用如下：

ImplBuilder builder = new ImplBuilder();
builder.setAge(20);
builder.setName("王五");
builder.setAddress("南京");
builder.setBorn("武汉");
builder.setSex("男");
builder.create();