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Declaring and initializing variables within Java switches
I have a crazy question about Java switches.
6 Answers
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What does “Could not find or load main class” mean?
A common problem that new Java developers experience is that their programs fail to run with the error message: Could not find or load main class ...
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Splitting a Java String by the pipe symbol using split(“|”)
The Java official documentation states:
7 Answers
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Is there a common Java utility to break a list into batches?
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Check out Lists.partition(java.util.List, int) from Google Guava:
Returns consecutive sublists of a list, each of the same size (the final list may be smaller). For example, partitioning a list containing [a, b, c, d, e] with a partition size of 3...
Convert Enumeration to a Set/List
Is there some one-liner bridge method to dump a given Enumeration to java.util.List or java.util.Set?
6 Answers
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What is the default initialization of an array in Java?
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Everything in a Java program not explicitly set to something by the programmer, is initialized to a zero value.
For references (anything that holds an object) that is null.
For int/short/byte/long that is a 0.
For float/double that is a ...
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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What is the difference between the Eclipse Package Explorer and the Eclipse Project Explorer?
...tomized by the specific
configuration of your Workbench.
With only the java developer tools (JDT) installed the Project Explorer nearly looks and behaves for java projects as the Package Explorer (including refactoring and other source code operations in the context menu). But Project Explorer i...
Why doesn't java.lang.Number implement Comparable? [duplicate]
Does anyone know why java.lang.Number does not implement Comparable ? This means that you cannot sort Number s with Collections.sort which seems to me a little strange.
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How to extract numbers from a string and get an array of ints?
... sign -- optionally. \d matches a digit, and we need to write \ as \\ in a Java String though. So, \d+ matches 1 or more digits.
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