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Regular expression for negative values in flower brackets [closed]

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I need a regex for patterns like
1) {-1,},
2) {-1,-2},
3) {,-2}
Please help me out.

try this,
String regex="\\{-?(\\d+)?,-?(\\d+)?},?";
String str="{-2,}";
System.out.println(str.matches(regex));

Try this,
^\{(\-\d+)?,(\-\d+)?\}$
Hope it works for you.

Tree of String Objects in JAVA [closed]

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I'm trying to translate a chess application that I had made in cpp, to java.
In my cpp version I had a structure which created a tree of strings.
Note, it was not a binary tree.
It was a vector of pointers, so from each node I had multiple subnodes stemming from it.
Does any one know how I could create a similar class in java?

public class ChessObject() {
private String description;
private List<ChessObject> subChessObjects;
}

How to get key and value from a string [closed]

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I have a question about how to write a regex expression to get the key and value pairs from below string?
{"ReturnCode":"0","ErrorMsg":"success","EncryToken":"##xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"}
Could someone help me learn on what this can be done?
Thanks very much.

This one should suit your needs:
"([^"]+)"\s*:\s*"([^"]+)"
The key is in the first group, the value in the second one.
Visualization by Debuggex

You can use Java JSON or the Google Gson to parse this JSON string ...
as illustrated here - http://answers.oreilly.com/topic/257-how-to-parse-json-in-java/

How to store long range number [closed]

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I have to store this value.but eclipse shows error on that.
private final long cal_To_eV = 26131952998320000000L;
plz tell me how to store this.

Have a look at the class BigInteger.

You can use String not long. Also you can use BigInteger or BigDouble.
private final BigInteger cal_To_eV = new BigInteger("26131952998320000000");

Difference between shaHex , sha256Hex , sha384Hex , sha512Hex [closed]

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In the apache commons-codec API what is the difference between generating a shaHex, sha256Hex, sha384Hex, sha512Hex?
These are static methods in the DigestUtils class.

These are simply implementations of different algorithms in the SHA family. See this section of the Wikipedia page on SHA for a summary of the differences.
And in fact the javadoc for DigestUtils makes it clear which methods implement which functions.