This program prints out the right output but it needs to be in alphabetical orde

Question

This program prints out the right output but it needs to be in alphabetical order.

this is the .txt file used in the command line for the code:

Here is my program:

import java.io.*;
import java.util.*;
public class BloodBank{
public static void main(String[] args) throws Exception{
BufferedReader infile = new BufferedReader( new FileReader( "type2pres.txt" ) );
String thisLine = null;
// Declaring Map to store president names with their blood groups
Map<String, String> map = new HashMap<String, String>();
Map<String, String> reverse_map = new TreeMap<String, String>();
while ((thisLine = infile.readLine()) != null) {
// Logic for processing the file and preparing the Map to store the President names along with their respective blood groups
String[] splited = thisLine.split(" ");
for (String part : splited) {
String[] splitLine = part.split(",");
String indexVal = splitLine[0];
String president_names = "";
if(indexVal.equals("O")){
Arrays.sort(splitLine);
String o_group_president_names = "";
for(int i = 0; i < splitLine.length; i++){
if(!splitLine[i].equals("O")){
o_group_president_names = o_group_president_names + " " + splitLine[i];
reverse_map.put(splitLine[i],indexVal);
}
}
map.put(indexVal, o_group_president_names);
}else{
Arrays.sort(splitLine);
for(int i = 1; i < splitLine.length; i++){
president_names = president_names + " " + splitLine[i];
reverse_map.put(splitLine[i],indexVal);
}
map.put(indexVal, president_names);
}
}
System.out.println();
}
for (Map.Entry<String, String> entry : map.entrySet()) {
System.out.println(" "+entry.getKey() + " : " + entry.getValue());
}
System.out.println();
for (Map.Entry<String, String> entry : reverse_map.entrySet()) {
System.out.println(" "+entry.getKey() + " : " + entry.getValue());
}
} // MAIN
} // BLOODBANK

above is what the output is supposed to look like.

below is what my output looks like

B+ : F.D.Roosevelt J.A.Garfield T.L.Hoffman
A+ : B.H.Obama G.W.Bush J.F.Kennedy
B- :
A- : A.Lincoln G.A.Ford L.B.Johnson U.S.Grant W.J.Clinton
O : C.A.Arthur G.Cleveland R.M.Nixon

A.Lincoln : A-
B.H.Obama : A+
C.A.Arthur : O
F.D.Roosevelt : B+
G.A.Ford : A-
G.Cleveland : O
G.W.Bush : A+
J.A.Garfield : B+
J.F.Kennedy : A+
L.B.Johnson : A-
R.M.Nixon : O
T.L.Hoffman : B+
U.S.Grant : A-
W.J.Clinton : A-

Command Prompt CNUs erst im Desktop an java an A+ B. H. Obama G. W. Bush J. F. Kennedy A. Lincoln G.A. Ford L. B. Johnson U. S. Grant W. J. Clint on B+ F. D. Roosevelt J. A. Garfield T. L. Hoffman C. A. Arthur G.Cleveland R.M.Nixon A. Lincoln B. H. alma A+ C. A. Arthur F. D. Roosevelt B+ G. A. Ford G. Cleveland G. W. Bush A+ J. A. Garfield B+ J. F. Kennedy A+ L. B. Johnson R. M. Nixon T. L. Hoffman B+ U.S. Grant W. J. Clinton C: Users tim Desktop an

Explanation / Answer

import java.io.*;
import java.util.*;
public class BloodBank{
public static void main(String[] args) throws Exception{
BufferedReader infile = new BufferedReader( new FileReader( "type2pres.txt" ) );
String thisLine = null;
// Declaring Map to store president names with their blood groups
Map<String, String> map = new TreeMap<String, String>();
Map<String, String> reverse_map = new TreeMap<String, String>();
while ((thisLine = infile.readLine()) != null) {
// Logic for processing the file and preparing the Map to store the President names along with their respective blood groups
String[] splited = thisLine.split(" ");
for (String part : splited) {
String[] splitLine = part.split(",");
String indexVal = splitLine[0];
String president_names = "";
if(indexVal.equals("O")){
Arrays.sort(splitLine);
String o_group_president_names = "";
for(int i = 0; i < splitLine.length; i++){
if(!splitLine[i].equals("O")){
o_group_president_names = o_group_president_names + " " + splitLine[i];
reverse_map.put(splitLine[i],indexVal);
}
}
map.put(indexVal, o_group_president_names);
}else{
Arrays.sort(splitLine);
for(int i = 1; i < splitLine.length; i++){
president_names = president_names + " " + splitLine[i];
reverse_map.put(splitLine[i],indexVal);
}
map.put(indexVal, president_names);
}
}
System.out.println();
}
for (Map.Entry<String, String> entry : map.entrySet()) {
System.out.println(" "+entry.getKey() + " : " + entry.getValue());
}
System.out.println();
for (Map.Entry<String, String> entry : reverse_map.entrySet()) {
System.out.println(" "+entry.getKey() + " : " + entry.getValue());
}
} // MAIN
} // BLOODBANK

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