用java编写一个建造器模式

建造器模式是一种创建型设计模式，它允许你创建不同风格的对象，同时避免构造函数污染。在Java中，你可以使用以下代码实现建造器模式：

public class Person {
private final String name;
private final int age;
private final String address;
private final String phone;

public static class Builder {
private String name;
private int age;
private String address;
private String phone;

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

public Builder setAge(int age) {
this.age = age;
return this;
}

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

public Builder setPhone(String phone) {
this.phone = phone;
return this;
}

public Person build() {
return new Person(this);
}
}

private Person(Builder builder) {
this.name = builder.name;
this.age = builder.age;
this.address = builder.address;
this.phone = builder.phone;
}

public String getName() {
return name;
}

public int getAge() {
return age;
}

public String getAddress() {
return address;
}

public String getPhone() {
return phone;
}
}

在这个例子中，我们创建了一个Person类，它有四个属性：name、age、address和phone。我们使用Builder类来构建Person对象，Builder类有四个setter方法，用于设置Person对象的属性。最后，我们在build()方法中创建Person对象，并将Builder对象传递给Person的构造函数。这种方法可以避免构造函数的参数过多，同时也可以让代码更加清晰易懂。