diff --git a/concore.java b/concore.java
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index 0000000..75347dd
--- /dev/null
+++ b/concore.java
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+// concore.java -- this java file will be the equivalent of concore.py
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+public class concore {
+    static String s = "";
+    static String olds = "";
+    static String inpath = "./in"; // must be relative path for local
+    static String outpath = "./out";
+    static int maxtime;
+    
+    public static int delay = 1; // second
+    public static int retrycount = 0;
+    public static double simtime;
+    public static Map<String, Integer> iport = new HashMap<>();
+    public static Map<String, Integer> oport = new HashMap<>();
+
+    public concore(){
+        iport = mapParser("concore.iport");
+        oport = mapParser("concore.oport");
+
+    }
+    public static void main(String[] args) {
+        // If Windows, create script to kill this process
+        // because batch files don't provide an easy way to know the PID of the last command
+        // Ignored for POSIX!=Windows, because "concorepid" is handled by script
+        // Ignored for Docker (Linux!=Windows), because handled by docker stop
+        if (System.getProperty("os.name").toLowerCase().contains("windows")) {
+            try {
+                FileWriter fpid = new FileWriter("concorekill.bat");
+                fpid.write("taskkill /F /PID " + ProcessHandle.current().pid() + "\n");
+                fpid.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+
+        default_maxtime(100);
+    }
+
+    private static Map<String, Integer> mapParser(String filename) {
+        Map<String, Integer> config = new HashMap<>();
+        StringBuilder portstr = new StringBuilder(); // StringBuilder to store file data        
+        try (BufferedReader reader = new BufferedReader(new FileReader(filename))) {
+            int ch;
+            while ((ch = reader.read()) != -1) {
+                portstr.append((char) ch); // Add character to string builder
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        
+        portstr.setCharAt(portstr.length() - 1, ','); // Replace last character with comma
+        portstr.append("}");
+        int i = 0;
+        String portname = "";
+        String portnum = "";
+
+        while(portstr.charAt(i) != '}'){
+            if(portstr.charAt(i) == '\''){
+                i++;
+                while(portstr.charAt(i) != '\''){
+                    portname += portstr.charAt(i);
+                    i++;
+                }
+                config.put(portname,0);
+            }
+            if(portstr.charAt(i) == ':'){
+                i++;
+                while(portstr.charAt(i) != ','){
+                    portnum += portstr.charAt(i);
+                    i++;
+                }
+                config.put(portname,Integer.parseInt(portnum));
+                portname = "";
+                portnum = "";
+            }
+            i++;
+        }
+        return config;
+    }
+
+    //function to compare and determine whether file content has been changed
+    public static boolean unchanged() {
+        if (olds.equals(s)) {
+            s = "";
+            return true;
+        } else {
+            olds = s;
+            return false;
+        }
+    }
+
+    private static ArrayList<Double> parser(String f){
+        ArrayList<Double> temp = new ArrayList<>();
+        String value = "";
+        // Changing last bracket to comma to use comma as a delimiter
+        f = f.substring(0, f.length() - 1) + ",";
+        for(int i=1;i<f.length();i++){
+            if(f.charAt(i) != ','){
+                value += f.charAt(i);
+            }
+            else{
+                if(value.length() != 0)
+                temp.add(Double.parseDouble(value));
+
+                // reset value
+                value = "";
+            }
+        }
+        return temp;
+    }
+
+    //accepts the file name as string and returns a string of file content
+    public static ArrayList<Double> read(int port, String name, String initstr) {
+        String ins = "";
+        try {Thread.sleep(1000 * delay);}
+        catch(InterruptedException e){
+            e.printStackTrace();
+        }
+        try (BufferedReader reader = new BufferedReader(new FileReader(inpath + String.valueOf(port) + "/" + name))) {
+            int ch;
+            while ((ch = reader.read()) != -1) {
+                ins += ((char) ch); // Add character to string
+            }
+        }catch(IOException e){
+            ins = initstr;
+            e.printStackTrace();
+        } 
+
+
+        while(ins.length() == 0){
+            try {Thread.sleep(1000 * delay);}
+            catch(InterruptedException e){
+                e.printStackTrace();
+            }
+            try (BufferedReader reader = new BufferedReader(new FileReader(inpath + String.valueOf(port) + "/" + name))) {
+                int ch;
+                while ((ch = reader.read()) != -1) {
+                    ins += ((char) ch); // Add character to string
+                }
+                retrycount++;
+            } catch (IOException e) {
+                //observed retry count in java from various tests is not calculated yet
+                retrycount++;
+                System.out.println("Read error");
+                e.printStackTrace();
+            }
+        }
+        s += ins;
+
+        ArrayList<Double> inval = new ArrayList<>();
+        inval = parser(ins);
+        simtime = simtime > inval.get(0) ? simtime : inval.get(0);
+
+        // returning a string with data exluding simtime
+        inval.remove(0);
+        return inval;
+    }
+
+    //write method, accepts a vector double and writes it to the file
+    public static void write(int port, String name, ArrayList<Double> val, int delta) {
+        try (BufferedWriter writer = new BufferedWriter (new FileWriter(outpath + String.valueOf(port) + "/" + name))){
+            val.add(0,simtime+delta);
+            writer.write('[');
+            for(int i=0;i<val.size()-1;i++){
+                writer.write(val.get(i).toString());
+                writer.write(',');
+            }
+            writer.write(val.size()-1);
+            writer.write(']');
+        } catch (IOException e) {
+            System.out.println("skipping +" + outpath + port + " /" + name);
+            e.printStackTrace();
+        }
+    }
+
+    //write method, accepts a string and writes it to the file
+    public static void write(int port, String name, String val, int delta) {
+        try {Thread.sleep(1000 * delay);}
+        catch(InterruptedException e){
+            e.printStackTrace();
+        }
+        try (BufferedWriter writer = new BufferedWriter (new FileWriter(outpath + String.valueOf(port) + "/" + name))){
+            writer.write(val);
+        } catch (IOException e) {
+            System.out.println("skipping +" + outpath + port + " /" + name);
+            e.printStackTrace();
+        }
+    }
+
+    public static void default_maxtime(int defaultValue) {
+        try(BufferedReader reader = new BufferedReader(new FileReader(inpath+"1/concore.maxtime"))){
+            String line = reader.readLine();
+            maxtime = Integer.parseInt(line);
+            
+        } catch (IOException e) {
+            maxtime = defaultValue;
+        }
+    }
+
+    //Initializing
+    public static ArrayList<Double> initval(String simtimeVal) {
+        //parsing
+        ArrayList<Double> val = parser(simtimeVal);
+        
+
+        //determining simtime
+        simtime = val.get(0);
+
+        //returning the rest of the values(except simtime) in val
+        val.remove(0);
+        return val;
+    }
+}
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