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When should we use intern method of String on String literals
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Java automatically interns String literals. This means that in many cases, the == operator appears to work for Strings in the same way that it does for ints or other primitive values.
Since interning is automatic for String ...
Generating all permutations of a given string
...a and ab , but what about longer string such as abcdefgh ? Is there any Java implementation example?
52 Answers
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Why does int num = Integer.getInteger(“123”) throw NullPointerException?
...to (int) 123, you can use e.g. int Integer.parseInt(String).
References
Java Language Guide/Autoboxing
Integer API references
static int parseInt(String)
static Integer getInteger(String)
On Integer.getInteger
Here's what the documentation have to say about what this method does:
pub...
Why doesn't Java allow generic subclasses of Throwable?
According to the Java Language Sepecification , 3rd edition:
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MFC的多国语言界面的实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
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1． 新建工程
新建了一个对话框工程，工程名称为MultiLanguages，默认语言选择是“中文”。
2． 添加多国语言的资源
在创建工程后，工程会添加默认的资源，如主对话框，都是“中文”资源。现在我们需要添加相应的英文...
Why is Class.newInstance() “evil”?
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The Java API documentation explains why (http://java.sun.com/javase/6/docs/api/java/lang/Class.html#newInstance()):
Note that this method propagates any exception thrown by the nullary constructor, including a checked excepti...
What does JVM flag CMSClassUnloadingEnabled actually do?
I cannot for the life of me find a definition of what the Java VM flag CMSClassUnloadingEnabled actually does, other than some very fuzzy high-level definitions such as "gets rid of your PermGen problems" ( which it doesn't , btw).
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How to go about formatting 1200 to 1.2k in java
I'd like to format following numbers into the numbers next to them with java:
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Recommended way to get hostname in Java
... best and most portable way to get the hostname of the current computer in Java?
11 Answers
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How to read environment variables in Scala
In Java, reading environment variables is done with System.getenv() .
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