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What does a tilde in angle brackets mean when creating a Java generic class?
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Just for personal clarification - IntelliJ produces Java source files with this notation, iaw, source files with illegal Java content??? Or is this just the view of the source and the saved file is correct?
– Andreas Dolk
Feb 3 '11 at 15:...
warning: [options] bootstrap class path not set in conjunction with -source 1.5
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From a blog post:
To use javac from JDK N to cross-compiler to an older platform version, the correct practice is to:
Use the older -source setting.
Set the bootclasspath to compile against the rt.jar (or equivalent) for the older platform....
Can enums be subclassed to add new elements?
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No, you can't do this in Java. Aside from anything else, d would then presumably be an instance of A (given the normal idea of "extends"), but users who only knew about A wouldn't know about it - which defeats the point of an enum being a well-known ...
Converting Long to Date in Java returns 1970
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tl;dr
java.time.Instant // Represent a moment as seen in UTC. Internally, a count of nanoseconds since 1970-01-01T00:00Z.
.ofEpochSecond( 1_220_227_200L ) // Pass a count of whole seconds since the same epoch...
How to break out or exit a method in Java?
The keyword break in Java can be used for breaking out of a loop or switch statement. Is there anything which can be used to break from a method?
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Best way to work with dates in Android SQLite [closed]
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Always make sure to store the UTC/GMT time, especially when working with java.util.Calendar and java.text.SimpleDateFormat that use the default (i.e. your device's) time zone.
java.util.Date.Date() is safe to use as it creates a UTC value.
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Java SafeVarargs annotation, does a standard or best practice exist?
I've recently come across the java @SafeVarargs annotation. Googling for what makes a variadic function in Java unsafe left me rather confused (heap poisoning? erased types?), so I'd like to know a few things:
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常用Git命令汇总 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...散，于是汇总了一些常用的Git命令。
常用配置
system #系统级别
--global #用户全局
--local #单独一个项目
git config --global user.name "xxxx" #用户名
git config --global user.email "xxxx@xxx.com" #邮箱
git config --global core.editor vim #编辑器
git c...
What are fail-safe & fail-fast Iterators in Java
There are two types of iterators in Java: fail-safe and fail-fast.
4 Answers
4
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Split Java String by New Line
...gex, limit) with negative limit like text.split("\\r?\\n", -1). More info: Java String split removed empty values
– Pshemo
Jul 19 '16 at 13:08
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