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What is the difference between compare() and compareTo()?
What is the difference between Java's compare() and compareTo() methods? Do those methods give same answer?
16 Answers
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Converting BigDecimal to Integer
...red Oct 28 '10 at 14:01
willcodejavaforfoodwillcodejavaforfood
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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...
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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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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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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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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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...
How to add new elements to an array?
...st<String>. It's dynamically growable, unlike arrays (see: Effective Java 2nd Edition, Item 25: Prefer lists to arrays).
import java.util.*;
//....
List<String> list = new ArrayList<String>();
list.add("1");
list.add("2");
list.add("3");
System.out.println(list); // prints "[1, 2...