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Method has the same erasure as another method in type
...t allowed, drawn from the JLS. Suppose, before generics were introduced to Java, I wrote some code like this:
class CollectionConverter {
List toList(Collection c) {...}
}
You extend my class, like this:
class Overrider extends CollectionConverter{
List toList(Collection c) {...}
}
After t...
Java - escape string to prevent SQL injection
I'm trying to put some anti sql injection in place in java and am finding it very difficult to work with the the "replaceAll" string function. Ultimately I need a function that will convert any existing \ to \\ , any " to \" , any ' to \' , and any \n to \\n so that when the string is e...
What is the easiest way to get the current day of the week in Android?
...
Use the Java Calendar class.
Calendar calendar = Calendar.getInstance();
int day = calendar.get(Calendar.DAY_OF_WEEK);
switch (day) {
case Calendar.SUNDAY:
// Current day is Sunday
break;
case Calendar.MOND...
Why do I need to override the equals and hashCode methods in Java?
...
Joshua Bloch says on Effective Java
You must override hashCode() in every class that overrides equals(). Failure to do so will result in a violation of the general contract for Object.hashCode(), which will prevent your class from functioning properly in ...
Regex: match everything but specific pattern
...to define the unambiguous start of string, and \z (in Python, it is \Z, in JavaScript, $ is OK) to define the very end of the string.
Dot note: In many flavors (but not POSIX, TRE, TCL), . matches any char but a newline char. Make sure you use a corresponding DOTALL modifier (/s in PCRE/Boost/.NET/P...
Java Byte Array to String to Byte Array
...e! I think you've completely understood what I was after... I'm not from a Java background, so I couldn't really figure out the conversion I needed. Just for info, I'm sending s1 to the server, and the server is replying with s1 (I can verify that the server received and replied with the data in s1)...
How can I generate an MD5 hash?
Is there any method to generate MD5 hash of a string in Java?
34 Answers
34
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Convert Json Array to normal Java list
Is there a way to convert JSON Array to normal Java Array for android ListView data binding?
14 Answers
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Type List vs type ArrayList in Java [duplicate]
...rn types being changed as well (will cause a NoSuchMethodException between Java versions if the internal return type changes). An example of this is the change in the return type of keySet in ConcurrentHashMap between Java 7 and 8.
– Rogue
Mar 12 '15 at 23:11
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Difference between File.separator and slash in paths
...hat is the difference between using File.separator and a normal / in a Java Path-String?
14 Answers
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