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  1. import java.util.*;
  2. import java.io.BufferedReader;
  3. import java.io.BufferedWriter;
  4. import java.io.FileReader;
  5. import java.io.FileWriter;
  6. import java.io.IOException;
  7. import java.util.regex.Matcher;
  8. import java.util.regex.Pattern;
  9.  
  10. public class Main {
  11.     public static void main(String[] args) {
  12.         String in = "input.txt";
  13.         String out = "output.txt";
  14.         try {
  15.             BufferedReader reader = new BufferedReader(new FileReader(in));
  16.             BufferedWriter writer = new BufferedWriter(new FileWriter(out));
  17.             String line;
  18.             while ((line = reader.readLine()) != null) {
  19.                 if (line.startsWith("1")) Problem1(reader, writer);
  20.                 else if (line.startsWith("2"))Problem2(reader, writer);
  21.                 else if (line.startsWith("3"))Problem3(reader, writer);
  22.                 else if (line.startsWith("4"))Problem4(reader, writer);
  23.                 else if (line.startsWith("5"))Problem5(reader, writer);
  24.                 else if (line.startsWith("7"))Problem7(reader, writer);
  25.             }
  26.             reader.close();
  27.             writer.close();
  28.         } catch (IOException e) {
  29.             e.printStackTrace();
  30.         }
  31.     }
  32.  
  33.     private static void Problem1(BufferedReader reader, BufferedWriter writer) throws IOException {
  34.         String s;
  35.         Pattern pattern = Pattern.compile("\\b[A-Za-z0-9._-]+@[A-Za-z-]+\\.[A-Z|a-z]{2,}\\b");
  36.         writer.write("1\n");
  37.         while ((s = reader.readLine()) != null && !s.equals("end")) {
  38.             Matcher matcher = pattern.matcher(s);
  39.             if(matcher.matches())writer.write("valid  email"+"\n");
  40.             else writer.write("invalid email"+"\n");
  41.  
  42.         }
  43.         writer.write("x\n");
  44.     }
  45.  
  46.  
  47.     private static void Problem2(BufferedReader reader, BufferedWriter writer) throws IOException {
  48.         String s;
  49.         Pattern pattern = Pattern.compile("^(\\(\\d{3}\\)|\\d{3})[-.\\s]?\\d{3}[-.\\s]?\\d{4}$");
  50.         writer.write("2\n");
  51.         while ((s = reader.readLine()) != null && !s.equals("end")) {
  52.             Matcher matcher = pattern.matcher(s);
  53.             if(matcher.matches())writer.write("valid phone number"+ "\n");
  54.             else writer.write("invalid phone number"+ "\n");
  55.  
  56.         }
  57.         writer.write("x\n");
  58.     }
  59.  
  60.  
  61.     private static void Problem3(BufferedReader reader, BufferedWriter writer) throws IOException {
  62.         String s;
  63.         Pattern pattern = Pattern.compile("((^\\d{4}[-/]\\d{1,2}[-/]\\d{1,2}$)|(^\\d{1,2}[-/]\\d{1,2}[-/]\\d{4}$))");
  64.         writer.write("3\n");
  65.         while ((s = reader.readLine()) != null && !s.equals("end")) {
  66.             Matcher matcher = pattern.matcher(s);
  67.             if(matcher.matches())writer.write("valid date"+ "\n");
  68.             else writer.write("invalid date"+ "\n");
  69.  
  70.         }
  71.         writer.write("x\n");
  72.     }
  73.  
  74.  
  75.     private static void Problem4(BufferedReader reader, BufferedWriter writer) throws IOException {
  76.         String s;
  77.         Pattern pattern = Pattern.compile("((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])$");
  78.         writer.write("4\n");
  79.         while ((s = reader.readLine()) != null && !s.equals("end")) {
  80.             Matcher matcher = pattern.matcher(s);
  81.             if(matcher.matches())writer.write("valid IP address"+ "\n");
  82.             else writer.write("invalid IP address"+ "\n");
  83.  
  84.         }
  85.         writer.write("x\n");
  86.     }
  87.  
  88.  
  89.     private static void Problem5(BufferedReader reader, BufferedWriter writer) throws IOException {
  90.         String s;
  91.         Pattern pattern = Pattern.compile("^[a-zA-Z_][a-zA-Z0-9_]*$");
  92.         writer.write("5\n");
  93.         while ((s = reader.readLine()) != null && !s.equals("end")) {
  94.             Matcher matcher = pattern.matcher(s);
  95.             if(matcher.matches())writer.write("valid C++ variable name"+ "\n");
  96.             else writer.write("invalid C++ variable name"+ "\n");
  97.  
  98.         }
  99.         writer.write("x\n");
  100.     }
  101.  
  102.     private static void Problem7(BufferedReader reader, BufferedWriter writer) throws IOException {
  103.         String s;
  104.         Pattern pattern = Pattern.compile("((a(aa|bb|abab|baba)*b(aa|bb|abab|baba)*)|((bb|aa|abab|baba)*(ab|ba)(bb|aa|abab|baba)*)|(b(aa|bb|abab|baba)*a(aa|bb|abab|baba)*))");
  105.         writer.write("7\n");
  106.  
  107.         while ((s = reader.readLine()) != null && !s.equals("end")) {
  108.             writer.write('*'+s+"*\n");
  109.             Vector<String> vec1 = new Vector<String>();
  110.             Vector<Integer> vec2 = new Vector<Integer>();
  111.             Vector<Integer> vec3 = new Vector<Integer>();
  112.             Matcher matcher = pattern.matcher(s);
  113.             while (matcher.find()) {
  114.                 String matchedSubstring = matcher.group();
  115.                 int startIdx = matcher.start();
  116.                 int endIdx = matcher.end();
  117.                 vec1.add(matchedSubstring);
  118.                 vec2.add(startIdx);
  119.                 vec3.add(endIdx);
  120.             }
  121.             writer.write("number of matched substrings: "+vec1.size()+'\n');
  122.             for(int i=0;i<vec1.size();i++){
  123.                 writer.write("matched substring: "+vec1.get(i)+'\n');
  124.                 writer.write("start index: "+vec2.get(i)+", "+"end index: "+vec3.get(i)+'\n');
  125.             }
  126.  
  127.         }
  128.         writer.write("x\n");
  129.     }
  130.  
  131.  
  132.  
  133. }
  134.  
Success #stdin #stdout #stderr 0.12s 52860KB
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Standard input is empty
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Standard output is empty
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java.io.FileNotFoundException: input.txt (No such file or directory)
	at java.base/java.io.FileInputStream.open0(Native Method)
	at java.base/java.io.FileInputStream.open(FileInputStream.java:213)
	at java.base/java.io.FileInputStream.<init>(FileInputStream.java:155)
	at java.base/java.io.FileInputStream.<init>(FileInputStream.java:110)
	at java.base/java.io.FileReader.<init>(FileReader.java:60)
	at Main.main(Main.java:15)
https://ideone.com/TnX64i
language:
Java (HotSpot 12)
created:
36 days ago
visibility:
public

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