Java中case2中如何获取case1中输入的变量的值并实现加一操作

Question

Java中case2中如何获取case1中输入的变量的值并实现加一操作

        switch (line) {
            case "M":
                System.out.println("显示指定的年月份日历");

                System.out.print("Enter full year (e.g., 2001): ");
               int year = input.nextInt();
                // Prompt the user to enter month
                System.out.print("Enter month in number between 1 and 12: ");
                int month = input.nextInt();

// input.close();
// Print calendar for the month of the year
printMonth(year, month);

            case "P":
                System.out.println("显示前一月份日历");




                printMonth(year, getMonthName(month +1));

Answer 1

static int year=0,month=0;
switch (line) {
   case "M":
     System.out.println("显示指定的年月份日历");
     System.out.print("Enter full year (e.g., 2001): ");
     year = input.nextInt();     
     System.out.print("Enter month in number between 1 and 12: ");
     month = input.nextInt();
     printMonth(year, month);
   case "P":
    System.out.println("显示前一月份日历");
    printMonth(year, getMonthName(month +1));