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Java 8 NullPointerException in Collectors.toMap
The Java 8 Collectors.toMap throws a NullPointerException if one of the values is 'null'. I don't understand this behaviour, maps can contain null pointers as value without any problems. Is there a good reason why values cannot be null for Collectors.toMap ?
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How to find unused/dead code in java projects [closed]
What tools do you use to find unused/dead code in large java projects? Our product has been in development for some years, and it is getting very hard to manually detect code that is no longer in use. We do however try to delete as much unused code as possible.
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How to get the user input in Java?
...y of the following options based on the requirements.
Scanner class
import java.util.Scanner;
//...
Scanner scan = new Scanner(System.in);
String s = scan.next();
int i = scan.nextInt();
BufferedReader and InputStreamReader classes
import java.io.BufferedReader;
import java.io.InputStreamReader;
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Scanning Java annotations at runtime [closed]
...h for classes whose fields have custom annotation?
– Javatar
Dec 12 '12 at 14:10
6
@Javatar Use J...
How do I print a double value without scientific notation using Java?
I want to print a double value in Java without exponential form.
14 Answers
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Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
I'd like to know the difference between the following in Java
11 Answers
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Naming conventions for java methods that return boolean(No question mark)
...sing question mark at the end of method/function names in other languages. Java doesn't let me do this. As a workaround how else can I name boolean returning methods in Java? Using an is , has , should , can in the front of a method sound okay for some cases. Is there a better way to name such ...
Why does Java's hashCode() in String use 31 as a multiplier?
Per the Java documentation, the hash code for a String object is computed as:
13 Answers
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Why are you not able to declare a class as static in Java?
Why are you not able to declare a class as static in Java?
14 Answers
14
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Does Java support default parameter values?
I came across some Java code that had the following structure:
24 Answers
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