Initial commit

Exercise/src/Chapter3/SubwayTicket.java

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+package Chapter3;
+
+import java.util.Scanner;
+
+public class SubwayTicket {
+    public static void main(String[] args) {
+        final String DESTINATION = "人民广场";
+        final double TICKET_PRICE = 2.00;
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("购票信息");
+        System.out.println("--------------------");
+        System.out.println("目的车站: " + DESTINATION);
+        System.out.printf("票价: %.2f\n", TICKET_PRICE);
+        System.out.print("购票数量: ");
+        int numberOfTickets = scanner.nextInt();
+        double amountDue = numberOfTickets * TICKET_PRICE;
+        System.out.printf("应付金额: %.0f\n", amountDue);
+        System.out.print("已付金额: ");
+        int amountPaid = scanner.nextInt();
+        double change = amountPaid - amountDue;
+        System.out.printf("找零: %.0f\n", change);
+        scanner.close();
+    }
+}