设计模式（建造者模式）

建造者模式用于创建相对复杂，组成较多的对象。它包括几类角色：

Product: 待被创建的对象，本例中是Table

builder:创建对象方法的抽象，本例中是TableBuilder

ConcreteBuilder:具体某个创建的实现，本例中是TableBuilderImpl

Director:封装builder接口

类图关系如下：



代码如下：

Table

package com.example;

public class Table {
private String head;
private String content;
private String footer;

public String getHead() {
return head;
}
public void setHead(String head) {
this.head = head;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getFooter() {
return footer;
}
public void setFooter(String footer) {
this.footer = footer;
}

public String getTable(){
return this.head + "_" + this.content + "_" + this.footer;
}
}

TableBuilder

public interface TableBuilder {
public TableBuilder setTableHead(String head);
public TableBuilder setTableContent(String content);
public TableBuilder setTableFooter(String footer);
public Table builder();
}

TableBuilderImpl

package com.example;

public class TableBuilderImpl implements TableBuilder {

private Table table;
private static final String TYPE = "TYPE1";

public TableBuilderImpl(){
table = new Table();
}

@Override
public TableBuilder setTableHead(String head) {
table.setHead(TYPE + head);
return this;
}

@Override
public TableBuilder setTableContent(String content) {
table.setContent(TYPE + content);
return this;
}

@Override
public TableBuilder setTableFooter(String footer) {
table.setFooter(TYPE + footer);
return this;
}

@Override
public Table builder() {
return table;
}
}

Director

public class Director {
private TableBuilder builder;

public Director(TableBuilder builder){
this.builder = builder;
}

public Table Builder(){
return builder.setTableHead("head")
.setTableContent("content")
.setTableFooter("footer")
.builder();
}
}

APP

public class App {

public static void main(String[] args) {
Director direct = new Director(new TableBuilderImpl());
Table table = direct.Builder();
System.out.println(table.getTable());
}
}