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How can I initialize a String array with length 0 in Java?
The Java Docs for the method
String[] java.io.File.list(FilenameFilter filter)
includes this in the returns description:
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Why does Math.round(0.49999999999999994) return 1?
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Summary
In Java 6 (and presumably earlier), round(x) is implemented as floor(x+0.5).1 This is a specification bug, for precisely this one pathological case.2 Java 7 no longer mandates this broken implementation.3
The problem
0.5+0....
Left padding a String with Zeros [duplicate]
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Why was this upvoted? It's related to JavaScript, not Java?
– mhvelplund
Mar 18 '18 at 20:37
2
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How can I increment a date by one day in Java?
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I'll quote some JavaDocs... Calendar.DATE: "...This is a synonym for DAY_OF_MONTH." I wish the JavaDocs would clarify that this would increment larger fields (like the month and year). Calendar.roll "Adds or subtracts (up/down) a single ...
How many characters can a Java String have?
... palindrome for a integer of up to a million digits. I thought about using Java's functions for reversing Strings, but would they allow for a String to be this long?
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Converting JSONarray to ArrayList
... }\n" +
" }\n" +
" ]";
ContactModel.java:
public class ContactModel {
public String id;
public String name;
public String email;
}
Code for converting a JSON string to ArrayList<Model>:
Note: You have to import java.lang.reflect.Type;:...
Maximum number of threads per process in Linux?
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Thank you, it finally allowed me to break through the 32k Java thread count.
– berezovskyi
Mar 11 '16 at 23:12
1
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Scala best way of turning a Collection into a Map-by-key?
...ements, this Scala code is about 20 times slower than the straight-forward Java approach (create HashMap with appropriate size, loop over list, put elements into map). For 5,000 elements, Scala ist about 8 times slower. The loop approach written in Scala is roughly 3 times faster than the toMap vari...
How can we prepend strings with StringBuilder?
...ple is: varStringBuilder.insert(0, "someThing");
It works both for C# and Java
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Parsing JSON array into java.util.List with Gson
...tring> and then parse the JSON array into that Type, like this:
import java.lang.reflect.Type;
import com.google.gson.reflect.TypeToken;
JsonElement yourJson = mapping.get("servers");
Type listType = new TypeToken<List<String>>() {}.getType();
List<String> yourList = new Gson...