Added Solution to SplitWise Prblem

SplitWise Problem/input.txt

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+SHOW
+SHOW u1
+EXPENSE u1 1000 4 u1 u2 u3 u4 EQUAL
+SHOW u4
+SHOW u1
+EXPENSE u1 1250 2 u2 u3 EXACT 370 880
+SHOW
+EXPENSE u4 1200 4 u1 u2 u3 u4 PERCENT 40 20 20 20
+SHOW u1
+SHOW

SplitWise Problem/splitwise.java

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+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+
+
+
+public class Application {
+    //database that keeps track of user on the basis of their userId
+	static HashMap<String,User> database = new HashMap<>();
+	public static void main(String[] args) throws IOException {BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
+
+		User u1 = new User("u1", "User1", "ramsingh@gmail.com", "8753493733");
+		u1.addToDatabase(database);
+		User u2 = new User("u2", "User2", "ankitsingh@gmail.com", "8676493733");
+		u2.addToDatabase(database);
+		User u3 = new User("u3", "User3", "premsingh@gmail.com", "875343433");
+		u3.addToDatabase(database);
+		User u4 = new User("u4", "User4", "shyamsingh@gmail.com", "87534456733");
+        u4.addToDatabase(database);
+
+        //variable that keeps track atleast one sharing took place.
+		boolean sharingStarted = false;
+		while(true) {
+		String[] s = br1.readLine().split(" ");
+		if(s[0].equalsIgnoreCase("SHOW")) {
+			if(!sharingStarted) {
+				System.out.println("No Balance");
+			}else {
+				if(s.length==1) {
+					Iterator hmIterator = database.entrySet().iterator();
+					while(hmIterator.hasNext()) {
+						Map.Entry mapElement = (Map.Entry)hmIterator.next();
+						User u = (User)mapElement.getValue();
+						u.showDebter(database);
+					}
+				}else if(s.length==2 && database.containsKey(s[1])) {
+					User u = (User)database.get(s[1]);
+					u.showDebter(database);
+					u.showBorrower(database);
+				}else {
+					System.out.println("Please Enter correct format.");
+				}
+			}
+
+		}else if(s[0].equalsIgnoreCase("EXPENSE")) {
+			sharingStarted = true;
+			User u = (User)database.get(s[1]);
+			double amount = Double.parseDouble(s[2]);
+			int number =Integer.parseInt(s[3]);
+			String type = s[3+number+1];
+			String[] debtUsers = new String[number];
+			for(int i=0;i<number;i++) {
+				debtUsers[i] =s[4+i];
+			}
+			divideMoney(s, debtUsers, type, amount, u, number);
+		}else {
+			System.out.println("Error!, Please Enter the data in Correct format");
+		}
+	}
+
+    }
+
+    //helper function that split money on the basis of type
+	public static void divideMoney(String[] s,String[] debtUsers,String type,Double amount,User u,int number) {
+		if(type.equals("EQUAL")) {
+			double a  = (amount*1.0)/number;
+			for(int i=0;i<number;i++) {
+					u.addDebt(debtUsers[i], a);
+					User w = (User)database.get(debtUsers[i]);
+					w.addBorrow(u.getUserId(), a);
+			}
+		}else if (type.equals("EXACT")) {
+			int x = 3+number+2;
+			double sum = 0;
+			for(int i=x;i<s.length;i++) {
+				double y = Double.parseDouble(s[i]);
+				sum+=y;
+			}
+			if(amount==sum) {
+				for(int i=0;i<number;i++) {
+					double a  = Double.parseDouble(s[x+i]);
+					u.addDebt(debtUsers[i], a);
+					User w = (User)database.get(debtUsers[i]);
+					w.addBorrow(u.getUserId(), a);
+				}
+			}else {
+				System.out.println("Error!,Sum of all distribution is not equal to Amount");
+			}
+		}else if(type.equalsIgnoreCase("PERCENT")) {
+			double sum = 0;
+			for(int i=0;i<number;i++) {
+				double x = Double.parseDouble(s[3+number+2+i]);
+				sum+=x;
+			}
+			if(sum==100) {
+				for(int i=0;i<number;i++) {
+					double x = Double.parseDouble(s[3+number+2+i]);
+					double a = amount*(x/100);
+					u.addDebt(debtUsers[i], a);
+					User w = (User)database.get(debtUsers[i]);
+					w.addBorrow(u.getUserId(), a);
+				}
+			}else {
+				System.out.println("Error!,Sum of all percentage is not equal to 100");
+			}
+		}
+	}
+
+}
+
+
+//User Class that has userId,name,email,mobileNo,debt,borrower as its field
+class User{
+	private String userId;
+	private String name;
+	private String email;
+	private String mobileNo;
+	private HashMap<String,Double> debt;
+	private HashMap<String, Double> borrow;
+
+	public User(String userId,String name,String email,String mobileNo) {
+		this.userId = userId;
+		this.name = name;
+		this.email = email;
+		this.mobileNo = mobileNo;
+		debt = new HashMap<>();
+		borrow = new HashMap<>();
+	}
+
+	public String getUserId() {
+		return userId;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public String getEmail() {
+		return email;
+	}
+
+	public String getMobileNo() {
+		return mobileNo;
+	}
+
+	public HashMap<String,Double > getDebt() {
+
+		return debt;
+	}
+
+	public HashMap<String, Double> getBorrow() {
+		return borrow;
+    }
+
+    //helper function that add all the user who had borrow money
+	public void addDebt(String debtUser,double amount) {
+			if(!debtUser.equals(this.userId)) {
+				if(this.debt.containsKey(debtUser)) {
+					double a =  (double)this.debt.get(debtUser);
+					a +=amount;
+					this.debt.put(debtUser, a);
+				}else {
+					this.debt.put(debtUser, amount);
+				}
+			}
+        }
+
+    //helper function that add the user whom current user has borrowed the money
+	public void addBorrow(String borrower,double amount) {
+		if(!borrower.equals(this.userId)) {
+			if(this.borrow.containsKey(borrower)) {
+				double a = (double)this.borrow.get(borrower);
+				a+=amount;
+				this.borrow.put(borrower, a);
+			}else {
+				this.borrow.put(borrower, amount);
+			}
+		}
+    }
+
+    //helper function that add the user to database
+	public void addToDatabase(HashMap<String, User> database) {
+		database.put(this.getUserId(),this);
+    }
+
+    //helper function list all user who has taken from him
+	public void showDebter(HashMap<String, User> database) {
+		Iterator debtIterator = debt.entrySet().iterator();
+		while(debtIterator.hasNext()) {
+			Map.Entry mapElement = (Map.Entry)debtIterator.next();
+			double value = (double)mapElement.getValue();
+			String userId = (String)mapElement.getKey();
+			String username = (String)database.get(userId).getName();
+			if(value>0) {
+				System.out.println(String.format("%s owes %s : %.2f",username,this.name,value));
+			}
+
+		}
+    }
+
+    //helper function list all user from whom this user has taken the money.
+	public void showBorrower(HashMap<String, User> database) {
+		Iterator borrowerIterator = borrow.entrySet().iterator();
+		while(borrowerIterator.hasNext()) {
+			Map.Entry mapElement = (Map.Entry)borrowerIterator.next();
+			double value = (double)mapElement.getValue();
+			String userId = (String)mapElement.getKey();
+			String username = (String)database.get(userId).getName();
+			if(value>0) {
+				System.out.println(String.format("%s owes %s : %.2f",this.name,username,value));
+			}
+		}
+	}
+
+}