建造者模式在开源代码中的应用

谁借莪１个温暖的怀抱￠ 2023-02-27 13:38 17阅读 0赞

建造者模式是将一个复杂对象分解成多个相对简单的部分，然后根据不同需要分别创建它们，最后构建成该复杂对象。

JDK 中 java.lang.StringBuilder 和 java.lang.StringBuffer 两个对字符串操作的类使用了建造者模式。类中的 append、delete、replace、insert、deleteCharAt、appendCodePoint 方法，通过传入字符或字符串相关的参数，return this 构造对象。

public StringBuilder append(String str) {
        super.append(str);
        return this;
    }
    
    public StringBuilder appendCodePoint(int codePoint) {
        super.appendCodePoint(codePoint);
        return this;
    }

public StringBuilder delete(int start, int end) {
        super.delete(start, end);
        return this;
    }
    
    public StringBuilder deleteCharAt(int index) {
        super.deleteCharAt(index);
        return this;
    }
    
    public StringBuilder replace(int start, int end, String str) {
        super.replace(start, end, str);
        return this;
    }
    
    public StringBuilder insert(int index, char[] str, int offset, int len)
    {
        super.insert(index, str, offset, len);
        return this;
    }

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### 【Java学习资源】整理推荐 ###

*  [原型模式在开源代码中的应用][Link 1]
 *  [建造者模式在开源代码中的应用][Link 2]
 *  [工厂模式在开源代码中的应用][Link 3]
 *  [单例模式在开源代码中的应用][Link 4]
 *  [编码规范][Link 5]
 *  [设计模式][Link 6]
 *  [重构][Link 7]
 *  [设计原则][Link 8]
 *  [面向对象到底是什么][Link 9]
 *  [代码质量有哪些评判标准？][Link 10]

--------------------

### 【Java面试题与答案】整理推荐 ###

*  [基础与语法][Link 11]
 *  [集合][Link 12]
 *  [网络编程][Link 13]
 *  [并发编程][Link 14]
 *  [Web][]
 *  [安全][Link 15]
 *  [设计模式][Link 16]
 *  [框架][Link 17]
 *  [算法与数据结构][Link 18]
 *  [异常][Link 19]
 *  [文件解析与生成][Link 20]
 *  [Linux][]
 *  [MySQL][]
 *  [Oracle][]
 *  [Redis][]
 *  [Dubbo][]

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