Javabuild模式
当⼀个类的参数多的情况下，使⽤重叠构造器模式客户端代码会很难编写，并且可读性差；使⽤javabean模式，调⽤⼀个⽆参的构造器，然后调⽤setter⽅法来设置每个必要的参数。但是javabean⾃⾝有着严重的缺点，因为构造过程被分到⼏个调⽤中，在构造javabean可能处于不⼀致的状态，类⽆法仅仅通过检验构造器参数的有效性来保证⼀致性。另⼀点不⾜之处，javabean模式阻⽌了把类做成不可变的可能，这就需要程序员付出额外的努⼒来确保他的线程安全； build模式 既能保证像重叠构造器那样的安全，也能实现JavaBean模式那样的可读性。
使⽤build模式的步骤：
(1)不直接⽣成想要的对象，⽽是让客户端利⽤所有必要的参数调⽤构造器（或者静态⼯⼚），得到⼀个build对象。
(2)然后让客户端在build对象上调⽤类似的setter⽅法来设置每个相关的可选参数，
(3)最后，客户端调⽤⽆参的build⽅法来⽣成不可变的对象。这个builder是它构建的静态成员类。
实例：
package ity;
/**
设备实体类
*  @author 崔耀强  20150507-20150822
*  @version 1.1
* */
import java.util.ArrayList;
public class Equipment  {
private int id;  //设备id
private String name;  //设备的名称
private String location;  //位置信息
private double coordinateX;  // 坐标x
private double coordinateY;  // 坐标y
private EquipmentType equipmentType;  //设备类型
private String IP;  //IP
private String port;  //端⼝号
private int module;  //属于哪个模块(设备连接和位置区分)
private int subSysId;  //属于哪个⼦系统
private String  health;  //设备健康值
private int netWorkState;  //⽹络情况
private ArrayList<BusinessValue> value;
public ArrayList<BusinessValue> getValue() {
return value;
}
public void setValue(ArrayList<BusinessValue> value) {
this.value = value;
}
public int getNetWorkState() {
return netWorkState;
}
public void setNetWorkState(int netWorkState) {
thisWorkState = netWorkState;
}
public String getHealth() {
return health;
}
public void setHealth(String health) {
this.health = health;
}
public int getCoordinateInterfaceID() {
return module;
}
public void setCoordinateInterfaceID(int coordinateInterfaceID) {  module = coordinateInterfaceID;
}
public String getIP() {
return IP;
}
public void setIP(String iP) {
IP = iP;
}
public String getPort() {
return port;
}
public void setPort(String port) {
this.port = port;
}
public EquipmentType getEquipmentType() {
return equipmentType;
}
public void setEquipmentType(EquipmentType equipmentType) {  this.equipmentType = equipmentType;
}
public double getCoordinateX() {
return coordinateX;
}
public void setCoordinateX(double coordinateX) {
}
public double getCoordinateY() {
return coordinateY;
}
public void setCoordinateY(double coordinateY) {
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLocation() {
return location;
return location;
}
public void setLocation(String location) {
this.location = location;
}
public Equipment(int id, String location ) {
this.id = id;
this.location = location;
}
public int getModleID() {
return subSysId;
}
public void setModleID(int modleID) {
this.subSysId = modleID;
}
public static class Builder {
private int id;  //设备id
private String name;  //shebei的名称
private String location;  //位置信息
private double coordinateX;  // 坐标x
private double coordinateY;  // 坐标y
private EquipmentType equipmentType;  //设备类型
private String IP;  //IP
private String port;  //端⼝号
private int module;  //属于哪个模块(设备连接和位置区分)
private int subSysId;  //属于哪个⼦系统
private String  health;  //设备健康值
private int netWorkState;  //⽹络情况
private ArrayList<BusinessValue> value;
public Builder(int id, String name,EquipmentType equipmentType,String location) {  super();
this.id = id;
this.name = name;
this.equipmentType = equipmentType;
this.location = location;
}
public Builder coordinate_X(double coordinate_X) {
return this;
}
public Builder coordinate_Y(double coordinate_Y) {
return this;
}
public Builder iP(String iP) {
IP = iP;
return this;
}
public Builder port(String port) {
this.port = port;
return this;
}
public Builder module(int module) {
return this;
}
public Builder subSysId(int subSysId) {
public Builder subSysId(int subSysId) {
this.subSysId = subSysId;
return this;
}
public Builder health(String health) {
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this.health = health;
return this;
}
public Builder netWorkState(int netWorkState) {
thisWorkState = netWorkState;
return this;
}
public Builder value(ArrayList<BusinessValue> value) {
this.value = value;
return this;
}
public Equipment build() {
return new Equipment(this);
}
}
private Equipment(Builder builder) {
id = builder.id;
name = builder.name;
location = builder.location;
coordinateX = dinateX;
coordinateY = dinateY;
equipmentType = builder.equipmentType;
IP = builder.IP;
port = builder.port;
module = dule;
subSysId = builder.subSysId;
health = builder.health;
netWorkState = builderWorkState;
value = builder.value;
}
public Equipment() {
super();
}
}
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