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How can I say a String matches my pattern [closed]

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how can I say that is my String match with this pattern: (install OS #name #version) which name and version can be any String without white space.

As you can use following Code:
// assuming parenthesis an sharp are pattern included:
String s = "(install OS #testname #testversion)";
if (s.matches("\\(install\\sOS\\s#\\S+\\s#\\S+\\)")) {
String[] splitted = s.split("\\s");
String name = splitted[2].replace("#", "");
String version = splitted[3].replace(")", "").replace("#", "");
System.out.println("name: " + name);
System.out.println("version: " + version);
}
// assuming parenthesis an sharp are both not pattern included:
s = "install OS testname2 testversion2";
if (s.matches("install\\sOS\\s\\S+\\s\\S+")) {
String[] splitted = s.split("\\s");
String name = splitted[2];
String version = splitted[3];
System.out.println("name: " + name);
System.out.println("version: " + version);
}
(if you need to allow mutliple whitespaces between parts, you have replace in both, split regex and match regex, \s with \s+)

How to use RegEx in Java? [closed]

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I would like to transfer the following code from Python to Java, but I get an error, while doing it:
import re
payload = re.search(
r'decrypt\.setPrivateKey\("(?P<privateKey>[^"]+)".*?'
r'decrypt\.decrypt\("(?P<cryptText>[^"]+)".*?'
r'document\.cookie="ipp_uid=(?P<ipp_uid>[^"]+)".*?'
r'document\.cookie="ipp_uid1=(?P<ipp_uid1>[^"]+)".*?'
r'document\.cookie="ipp_uid2=(?P<ipp_uid2>[^"]+)".*?'
r'url\s\+=\s"(?P<makeURL>.*?)"\;.*?'
r'salt="(?P<salt>[^"]+)"',
ret.content.decode('utf-8'),
re.MULTILINE | re.DOTALL
)
I have already tried the following code:
String patternString = "decrypt\\.setPrivateKey\\(\"(?P<privateKey>[^\"]+)\".*?\n"
+ " decrypt\\.decrypt\\(\"(?P<cryptText>[^\"]+)\".*?\n"
+ " document\\.cookie=\"ipp_uid=(?P<ipp_uid>[^\"]+)\".*?\n"
+ " document\\.cookie=\"ipp_uid1=(?P<ipp_uid1>[^\"]+)\".*?\n"
+ " document\\.cookie=\"ipp_uid2=(?P<ipp_uid2>[^\"]+)\".*?\n"
+ " url\\s\\+=\\s\"(?P<makeURL>.*?)\"\\;.*?\n"
+ " salt=\"(?P<salt>[^\"]+)\"";
Pattern payload = Pattern.compile(patternString);
String content = new String(html.getBytes(), "UTF-8");
Matcher m = payload.matcher(html);
if(m.find()){
System.out.println("Found: " + m.group(0));
}else{
System.out.println("not found");
}
... but I am getting this error:
java.util.regex.PatternSyntaxException: Unknown inline modifier near index 27
decrypt\.setPrivateKey\("(?P<privateKey>[^"]+)".*?
decrypt\.decrypt\("(?P<cryptText>[^"]+)".*?
document\.cookie="ipp_uid=(?P<ipp_uid>[^"]+)".*?
document\.cookie="ipp_uid1=(?P<ipp_uid1>[^"]+)".*?
document\.cookie="ipp_uid2=(?P<ipp_uid2>[^"]+)".*?
url\s\+=\s"(?P<makeURL>.*?)"\;.*?
salt="(?P<salt>[^"]+)"
^
at java.util.regex.Pattern.error(Pattern.java:1957)
at java.util.regex.Pattern.group0(Pattern.java:2896)
at java.util.regex.Pattern.sequence(Pattern.java:2053)
at java.util.regex.Pattern.expr(Pattern.java:1998)
at java.util.regex.Pattern.compile(Pattern.java:1698)
at java.util.regex.Pattern.<init>(Pattern.java:1351)
at java.util.regex.Pattern.compile(Pattern.java:1028)
at fabian.site.MyModule.test(MyModule.java:76)
at fabian.site.MyModule.run(MyModule.java:61)
at fabian.thread.ThreadPool$PoolThread.run(ThreadPool.java:50)
Thank you for your help guys!!

Two things stand out to me:
Named capturing groups in Java are structured like (?<name>X), not (?P<name>X), so you should remove the Ps
The names cannot contain "_", so you should replace ipp_uid with something like ippUid (only letters and numbers)
String patternString = "decrypt\\.setPrivateKey\\(\"(?<privateKey>[^\"]+)\".*?\n"
+ " decrypt\\.decrypt\\(\"(?<cryptText>[^\"]+)\".*?\n"
+ " document\\.cookie=\"ipp_uid=(?<ippuid>[^\"]+)\".*?\n"
+ " document\\.cookie=\"ipp_uid1=(?<ippuid1>[^\"]+)\".*?\n"
+ " document\\.cookie=\"ipp_uid2=(?<ippuid2>[^\"]+)\".*?\n"
+ " url\\s\\+=\\s\"(?<makeURL>.*?)\"\\;.*?\n"
+ " salt=\"(?<salt>[^\"]+)\"";
I don't have any sample data, so it's hard to tell whether it works this way, but it does compile without errors.

Java NewLine "\n" not working in save to text file [closed]

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Here is my code:
public String display() {
return "\n......................\nFixed Employee:\n" +
"Name: " + super.fullName() +
"\nSalary: " + salary() +
" tk\n......................";
}
But when I'm invoking this method from main class, "\n" newLine not working. just showing one line output. Will you plz help to solve the problem?
Thanks

For saving in files use \r\n. \n as new lines is viable on printstreams but not writing to files.

You may need the system independent line separator as it might differ from one OS to another. Just replace the \n with the value of line separator:
I can be retrieve as you load any system property:
public String display() {
String separator = System.getProperty("line.separator"); // Load the system property using its key.
return "\n......................\nFixed Employee:\n"
+ "Name: "
+ super.fullName() +
"\nSalary: "
+ salary()
+ " tk\n......................"
.replace("\\n", separator); // replace the \n before returning your String
}
Or simply use System#lineSeparator method as #Deepanshu Bedi suggested:
public String display() {
String separator = System.lineSeparator(); // Consider it as a shortcut.
return "\n......................\nFixed Employee:\n"
+ "Name: "
+ super.fullName() +
"\nSalary: "
+ salary()
+ " tk\n......................"
.replace("\\n", separator); // replace the \n before returning your String
}

can't find why loop don't go inside my condition in my java serrvlet [closed]

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#Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
WorldDBManager DB = new WorldDBManager();
String choices = request.getParameter("selectchoice");
List<WorlPopulationInfo> country = new ArrayList<>();
country = DB.getResultAsArrayList("world", "select * from country");
StringBuffer strB = new StringBuffer();
for(int i=0;i<country.size();i++){
if(country.get(i).countryName == choices){
strB.append("<option selected='selected'>" + country.get(i).countryName+"</option>");
System.out.println(choices + " pareil " + country.get(i).countryName);
}else if(country.get(i).countryName != choices){
strB.append("<option>" + country.get(i).countryName+"</option>");
System.out.println(choices + " " + country.get(i).countryName);
}
}
request.setAttribute("country", strB);
getServletContext().getRequestDispatcher("/index.jsp").forward(request, response);
}
i don't understand why he doesnt go to the first if condition i know the value from variable choices exist inside my database by doing a System.println. i just don't understand why is ignoring my equality. If someone could explain me what im doing wrong. thank.

Try -
if(country.get(i).countryName.equals(choices)){
You don't need else If there, only else would be sufficient
if(country.get(i).countryName.equals(choices)){
strB.append("<option selected='selected'>" + country.get(i).countryName+"</option>");
System.out.println(choices + " pareil " + country.get(i).countryName);
}else{
strB.append("<option>" + country.get(i).countryName+"</option>");
System.out.println(choices + " " + country.get(i).countryName);
}

Use .equals() for string comparisons.

I think you can´t compare string with == (maybe in 1.7). You have to use
if(country.get(i).countryName.equals(choices)){}

What are some better ways to print the following section? [closed]

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What are some better ways to print the following section? I think it will look better in a table format of some type with a heading. I want to adjust them to fixed lenghts, I think. Here is the code snippet I want to format to look better. The print elements are elements in a sql database.
System.out.println("\nAll records in your table:");
System.out.println("ID# Name GPA Status Mentor Level Thesis Advisor Company"); //table heading...
while (rs.next()) {
String output = " ";
output += rs.getString("studentID") + " "
+ rs.getString("firstName") + " "
+ rs.getString("lastName") + " "
+ rs.getString("gpa") + " "
+ rs.getString("status") + " "
+ rs.getString("mentor") + " "
+ rs.getString("level") + " "
+ rs.getString("thesisTitle") + " "
+ rs.getString("thesisAdvisor") + " "
+ rs.getString("company") + "\n";
System.out.printf("%s", output);
}

|You can|
|Do something|
|like this|
|studentname|
|firstname|
|middlename|
|.......|

"I want to adjust them to fixed lengths":
is that why your concatenating whitespaces in different lengths ?
You can try to concatenate "\t\t" instead.
In case it's HTML, using HTML Table will take care of it for you.