实习第16天开新坑 Effective Java 英文第二版读书笔记

最近每天上班下班有点时间看下 Effective Java。

我一般看看原文，在看看示例代码，再想想原文的意思。

我英文也不是很好，所以决定中文英文随便用.

Creating and destroying objects

Item 1: Consider static factory methods instead of constructors

Advantage of static factory methods

1.Unlike constructors. They have names.

2.They are not required to create a new object each time they’re invoked.

3.They can return an object of any subtype of their return type.

4.They reduce the verbosity of creating parameterized type instances.

public static Boolean valueOf(boolean b){
    return b?Boolean.TRUE:Boolean.FALSE;
}

A service provider framework.

In the case of JDBC . Connection plays the part of the service interface,DriverManager.registerDriver is the provider registration API,DriverManager.getConnection is the service access API,and Driver is the service provider interface.

时间： 2024-10-12 20:22:07

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