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How to compare objects by multiple fields
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With Java 8:
Comparator.comparing((Person p)->p.firstName)
.thenComparing(p->p.lastName)
.thenComparingInt(p->p.age);
If you have accessor methods:
Comparator.comparing(Person::getFirstName)
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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 ...
How do I change the language of moment.js?
I am trying to change the language of the date which is being set by moment.js. The default one is English, but I want to set the German language. These is what I tried:
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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...
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 doesn't Java allow generic subclasses of Throwable?
According to the Java Language Sepecification , 3rd edition:
5 Answers
5
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What is the correct way to get a subarray in Scala?
...scala> Array("foo", "hoo", "goo", "ioo", "joo").slice(1, 4)
res6: Array[java.lang.String] = Array(hoo, goo, ioo)
It works like in python.
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What is the difference between and ?
What is the difference between <html lang="en"> and <html lang="en-US"> ? What other values can follow the dash?
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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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