java - 创建和调用涉及多个 System.out.println() 和变量的方法

Question

我正在开发一个 Java 小程序，它可以向在我学校注册 AP 考试的学生发送电子邮件收据。代码如下所示。

// Create email text body for student who registered for an AP exam.

import java.util.Scanner;

class EmailText {

    public static void main(String args[]) {

        Scanner input = new Scanner(System.in);

        String first_name;
        String email;
        int numTests;
        char ch;
        char choice;
        int cost;

        System.out.print("Enter student first name: ");
        first_name = input.next();

        System.out.print("Enter student email: ");
        email = input.next();

        System.out.print("Enter number of tests ordered (1-9): ");
        numTests = input.nextInt();
        if(numTests < 10) {

            System.out.print("Did student qualify for fee waiver (y/n)? ");
            ch = input.next().charAt(0);

            if(ch == 'y') {
                cost = 5;
                int total = numTests * cost;

                System.out.println("** COPY/PASTE THIS DRAFT **");
                System.out.println("To: " + email);
                System.out.println("Subject: 2014 AP Test Receipt for " + first_name);
                System.out.println();
                System.out.println("Hi " + first_name + ",\n");
                System.out.println("Thank you for registering for the 2014 AP Exams!");
                System.out.println("According to our records, you ordered " + numTests + " tests.\n");
                System.out.println("Because you stated that you qualified for a fee waiver, " +
                        "each test will cost you $" + cost + ".");
                System.out.println("Your total cost is $" + cost + " * " + numTests +
                       " = $" + total + ".\n"); 
                System.out.println("Please submit your payment to the College Counseling Office ASAP.\nThank you.\n");
            }

            else if(ch == 'n') {
                cost = 89;
                int total = numTests * cost;

                System.out.println("** Copy/Paste this Draft **");
                System.out.println("To: " + email);
                System.out.println("Subject: 2014 AP Test Receipt for " + first_name);
                System.out.println();
                System.out.println("Hi " + first_name + ",\n");
                System.out.println("Thank you for registering for the 2014 AP Exams!");
                System.out.println("According to our records, you ordered " + numTests + " tests.");
                System.out.println("Because you stated that you qualified for a fee waiver, " +
                        "each test will cost you $" + cost + ".");
                System.out.println("Your total cost is $" + cost + " * " + numTests +
                       " = $" + total + ".\n"); 
                System.out.println("Please submit your payment to the College Counseling Office ASAP.\nThank you.\n");
            }
            } 
            else {
                System.out.println("Please start again.");
                return;
        }
    }
}

我遇到的问题是我在 else 和 if block 中重复相同的 System.out.println() 主体。相反，我想做的是创建一个可以在每个 block 中调用的方法。

如果可能的话，我怎样才能做到这一点？

Answer 1

如果这是您的意思，那么您需要阅读基础 Java，我已将您的方法添加到代码示例中，请阅读此链接以了解有关方法的更多信息:http://docs.oracle.com/javase/tutorial/java/javaOO/methods.html

有关更多信息，请参阅 Peter 的回答!

// Create email text body for student who registered for an AP exam.

import java.util.Scanner;

class EmailText {

    public static void main(String args[]) {

        int numTests, cost;
        String email, first_name;
        char ch;

        Scanner input = new Scanner(System.in);

        System.out.print("Enter student first name: ");
        first_name = input.next();

        System.out.print("Enter student email: ");
        email = input.next();

        System.out.print("Enter number of tests ordered (1-9): ");
        numTests = input.nextInt();
        if(numTests < 10) {

            System.out.print("Did student qualify for fee waiver (y/n)? ");
            ch = input.next().charAt(0);

            if(ch == 'y') {
                cost = 5;
                PrintStuff(numTests, cost, email, first_name, "qualified for a fee waiver, ");
            }
            else if(ch == 'n') {
                cost = 89;
                PrintStuff(numTests, cost, email, first_name, "did not qualify for a fee waiver, ");
            } else {
                System.out.println("Please start again.");
            }
        }
    }

    public static void PrintStuff(int numTests, int cost, String email, String first_name, String fw_status) {
        int total = numTests * cost;

        System.out.println("** COPY/PASTE THIS DRAFT **");
        System.out.println("To: " + email);
        System.out.println("Subject: 2014 AP Test Receipt for " + first_name);
        System.out.println();
        System.out.println("Hi " + first_name + ",\n");
        System.out.println("Thank you for registering for the 2014 AP Exams!");
        System.out.println("According to our records, you ordered " + numTests + " tests.\n");
        System.out.println("Because you stated that you " + fw_status +
                "each test will cost you $" + cost + ".");
        System.out.println("Your total cost is $" + cost + " * " + numTests +
               " = $" + total + ".\n"); 
        System.out.println("Please submit your payment to the Student Store ASAP.\nThank you.\n");
    }
}