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Can we instantiate an abstract class?
...th your classes. Suppose you put those classes in two different files:
My.java:
abstract class My {
public void myMethod() {
System.out.print("Abstract");
}
}
Poly.java:
class Poly extends My {
public static void main(String a[]) {
My m = new My() {};
m.myMet...
How to decompile an APK or DEX file on Android platform? [closed]
...ecompile an APK file.
Dex2jar - Tools to work with android .dex and java .class files
ApkTool - A tool for reverse engineering Android apk files
JD-GUI - Java Decompiler is a tools to decompile and analyze Java 5 “byte code” and the later versions.
for more how-to-use-dextojar. H...
UTF-8 byte[] to String
... And if checkstyle says: "Illegal Instantiation: Instantiation of java.lang.String should be avoided.", then what?
– Attila Neparáczki
Oct 29 '14 at 8:58
1
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How do synchronized static methods work in Java and can I use it for loading Hibernate entities?
...
"the whole class" is not locked. The Java machine language specification: For a class (static) method, the monitor associated with the Class object for the method's class is used. For an instance method, the monitor associated with this (the object for which the...
Underscore vs Double underscore with variables and methods [duplicate]
... you WILL regret it later.
Explanation:
People coming from a C++/Java background are especially prone to
overusing/misusing this "feature". But __private names don't work the
same way as in Java or C++. They just trigger a name mangling whose
purpose is to prevent accidental namespac...
Using switch statement with a range of value in each case?
In Java, is it possible to write a switch statement where each case contains more than one value? For example (though clearly the following code won't work):
...
What is BSON and exactly how is it different from JSON?
... Does that means, if i retrieve data from BSON document using Javascript, i won't get any datatype difference as i'll get when i retrieve using C/C++ i.e. numbers will be treated as integers if it doesn't have any decimal?
– abhisekp
Jan 19 '14 at ...
Regular expression for floating point numbers
.... and [0-9] instead of \d to avoid escaping issues in some languages (like Java).
Thanks to the nameless one for originally recognizing this.
One relatively simple pattern for matching a floating point number is
[+-]?([0-9]*[.])?[0-9]+
This will match:
123
123.456
.456
See a working exampl...
HashMap and int as key
...lt;Integer, MyObject> myMap = new HashMap<Integer, MyObject>();
Java will automatically autobox your int primitive values to Integer objects.
Read more about autoboxing from Oracle Java documentations.
share
...
How can I count occurrences with groupBy?
...h each group... and then Collectors.counting() to do the counting:
import java.util.*;
import java.util.stream.*;
class Test {
public static void main(String[] args) {
List<String> list = new ArrayList<>();
list.add("Hello");
list.add("Hello");
list...