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I want to print a lot of data to Stdout in the fastest possible way. One way is that I use a StringBuilder and keep appending the output to it and then print the stringbuffer. But sometimes this fails when the data to be printed is more than the maximum allowable size and gives Memory Limited Exceeded error. (for example in online judges). Is there some other better and faster way to print data?
You may try this:
try {
BufferedWriter log = new BufferedWriter(new OutputStreamWriter(System.out));
//.....
log.flush();
}
Although writing to a file directly will be more efficient
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I have just come across a string variable in my application code where the value is assigned as follows
String YEAR="${year}";
What does the value of the String variable here?
Without being interpolated, just ${year}.
I can almost guarantee that String is going to be interpolated elsewhere in the code.
Maven, for example, uses this syntax to inject variable values into it's configuration settings.
Use an IDE such as IntelliJ and do a find usage on this variable. An extended find (search/find in path) may also yield results.
As others here have suggested, It is most likely being interpolated somewhere else.
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Does in AP of the CAP theorm, is there a possibility (like in cassandra), that if i write/update to cassandra and immediately try to fetch it, can there a chance the data is not found or should my read o/p be paused before being fetched (hence allowing replications to settle in).
Can someone direct me to any link where people have addressed the consistency issue in cassandra.
Cassandra can be used to give the consistency that you describe. If the number of nodes you read from (R) plus the number of nodes you write to (W) is greater than the replication factor (N), you will read back a value immediately after it was written (assuming there are no concurrent writers who may write a later value in the small window since you wrote). So as long as R+W>N you will get this behaviour.
A common way to do this is to read and write at CL.QUORUM, since this gives you good availability. You could also e.g. read at CL.ONE and write at CL.ALL, but then writes will fail if a single node is down.
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is there any way to read from text file word by word (i.e without using split)? . I am able to read line by line directly with nextLine() with a scanner object, but I got error when I tried with next(). Thanks in advance.
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Anyone know how to count: how many times was run a single java file in Eclipse?And write the timestamp of the executed file in a file.txt.
Use the very easy way. Just use a .properties file. With it you are able to get and set one or more values. With that you are able to count the runs. Even if you want to count it for more classs or files!
To create a properties file, do it like so:
Properties prop = new Properties();
Before you can get a value, you have to load the file, into your Properties variable:
prop.load(new FileInputStream("config.properties"));
Than you have to set (or get) the value with a key, like:
prop.setProperty("classruncounter", "5");
or to get
prop.getProperty("classruncounter");
You can read more about that in that simple tutorial. I just give you a quick overview.
You have to create one file to save the value of variable which indicates how many times you run file in eclipse and updated when you run file again.
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I have below string which I get from an xml file.
<product>
<aa>1367</aa>
<ac>133787</ac>
<db>13345</db>
<ce>133</ce>
<er>135</er>
<et>130</et>
<ef>14</ef>
</product>
How do I convert it to an two dimension array like
product[][]={{"aa", "1367"},{"ac","133787"}, {"db","13345"}....}
I only want to use string function and loop.
I think the best way is to use an available XML parser.
In this thread: Best XML parser for Java you'll probably find which one is the best to use