Java 使根据相应数字打印月份名称的程序更短

此程序要求用户输入任何等于或介于1-12之间的数字。然后，它将数字转换为将要打印的消息（复制程序以便自己查看）。有没有办法缩短代码

import javax.swing.JOptionPane;

public class NumOfMonth {

public static void main(String[] args) {



    int num = Integer.parseInt (JOptionPane.showInputDialog ("Enter any number equal to or between 1-12 to display the month"));

    switch (num)
    {
    case 1:
        System.out.println ("The name of month number 1 is January");
        break;
    case 2:
        System.out.println ("The name of month number 2 is February");
        break;
    case 3:
        System.out.println ("The name of month number 3 is March");
        break;
    case 4:
        System.out.println ("The name of month number 4 is April");
        break;
    case 5:
        System.out.println ("The name of month number 5 is May");
        break;
    case 6:
        System.out.println ("The name of month number 6 is June");
        break;
    case 7:
        System.out.println ("The name of month number 7 is July");
        break;
    case 8:
        System.out.println ("The name of month number 8 is August");
        break;
    case 9:
        System.out.println ("The name of month number 9 is September");
        break;
    case 10:
        System.out.println ("The name of month number 10 is October");
        break;
    case 11:
        System.out.println ("The name of month number 11 is November");
        break;
    case 12:
        System.out.println ("The name of month number 12 is December");
        break;
        default:
            System.out.println ("You have entered an invalid number");
        }
    }
} 

是的，使用：

返回月字符串数组

我强烈建议您在访问数组之前检查边界。

import javax.swing.JOptionPane；
import javax.swing.JOptionPane;

public class NewClass {

    public static void main(String[] args) {

        String[] months = new String[]{
            "",
            "JAN",
            "FEB",
            "MAR",
            "APR",
            "MAY",
            "JUN",
            "JUL",
            "AUG",
            "SEP",
            "OCT",
            "NOV",
            "DEC"
        };

        int num = Integer.parseInt(JOptionPane.showInputDialog("Enter any number equal to or between 1-12 to display the month"));

        if (num >= 1 && num <= 12) {
            System.out.println("Name of month is " + months[num]);
        } else {
            System.out.println("INVALID ENTRY");
        }
    }
}

公共类新类{
公共静态void main（字符串[]args）{
字符串[]个月=新字符串[]{
"",
“简”，
“二月”，
“三月”，
“四月”，
“五月”，
“六月”，
“七月”，
“八月”，
“九月”，
“十月”，
“11月”，
“十二月”
};
int num=Integer.parseInt（JOptionPane.showInputDialog（“输入任何等于或介于1-12之间的数字以显示月份”）；
如果（num>=1&&num如果您的程序运行正常，并且您正在寻找一个审阅，那么它可能更适合。此外，您可以查看
枚举
或
数组
或
映射
。捕捉越界值不应该被忽略。经验丰富的读者应该注意，此方法根据有效值而改变返回值当然，只是让他们知道这不是1:1的简化。
import javax.swing.JOptionPane;

public class NewClass {

    public static void main(String[] args) {

        String[] months = new String[]{
            "",
            "JAN",
            "FEB",
            "MAR",
            "APR",
            "MAY",
            "JUN",
            "JUL",
            "AUG",
            "SEP",
            "OCT",
            "NOV",
            "DEC"
        };

        int num = Integer.parseInt(JOptionPane.showInputDialog("Enter any number equal to or between 1-12 to display the month"));

        if (num >= 1 && num <= 12) {
            System.out.println("Name of month is " + months[num]);
        } else {
            System.out.println("INVALID ENTRY");
        }
    }
}