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Converting BigDecimal to Integer
...red Oct 28 '10 at 14:01
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Check if a value exists in ArrayList
... HashSet than an ArrayList when you are checking for existence of a value.
Java docs for HashSet says: "This class offers constant time performance for the basic operations (add, remove, contains and size)"
ArrayList.contains() might have to iterate the whole list to find the instance you are looki...
When would you use a WeakHashMap or a WeakReference?
... Article now at web.archive.org/web/20061130103858/http://weblogs.java.net/blog/…
– mjn42
Jan 30 '19 at 8:38
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How do I pass a variable by reference?
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I find it hard to buy. To me is just as Java, the parameters are pointers to objects in memory, and those pointers are passed via the stack, or registers.
– Luciano
Dec 13 '11 at 1:25
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Sorting arraylist in alphabetical order (case insensitive)
... return s1.compareToIgnoreCase(s2);
}
});
Or if you are using Java 8:
list.sort(String::compareToIgnoreCase);
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How to implement a ViewPager with different Fragments / Layouts
.... Of course, any layout-file can be used for the Fragments.
FirstFragment.java has a orange background layout, SecondFragment.java has a green background layout and ThirdFragment.java has a red background layout. Furthermore, each Fragment displays a different text, depending on which class it is f...
List of all special characters that need to be escaped in a regex
... message template with a message that a user is trying to send. I am using Java regex for matching the message. The template/message may contain special characters.
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Spring get current ApplicationContext
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The following ApplicationContextProvider.java answer looks to be the most reliable solution for this.
– Ionut
Jan 17 '16 at 12:32
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Why does Java switch on contiguous ints appear to run faster with added cases?
I am working on some Java code which needs to be highly optimized as it will run in hot functions that are invoked at many points in my main program logic. Part of this code involves multiplying double variables by 10 raised to arbitrary non-negative int exponent s. One fast way (edit: but no...
JUnit 4 compare Sets
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Uhm, how come I get: java.lang.AssertionError: expected: java.util.Hashtable<{CompanyName=8PKQ9va3nW8pRWb4SjPF2DvdQDBmlZ, Ric=sZwmXAdYKv, Category=AvrIfd, QuoteId=4342740204922826921}> but was: java.util.Hashtable<{CompanyName=8PKQ9va3nW...