Question

import java.util.*;

public class Lab04B {
    public static String toMeters (int unitNumber) {
        String value;
        switch (unitNumber) {
            case 1:
                value = "Meter";
            break;
            case 2:
                value = "Nautical mile";
            break;
            case 3:
                value = "Furlong";
            break;
            case 4: 
                value = "Mil";
            break;
            case 5:
                value = "Rod";
            break;
            case 6:
                value = "Vershok";
            break;
            case 7:
                value = "Sheppey";
            break;
            case 8:
                return 1.702;
            default:
                return -1;
        }

        {
    public static double fromMeters (int unitNumber)
    {
        switch (unitNumber)
        {
            case 1:
                return 1;

            case 2:
                return 1/1852.0;    

            case 3:
                return 1/201.168;

            case 4: 
                return 1/0.0254;

            case 5:
                return 1/5.029;

            case 6:
                return 1/0.04445;

            case 7:
                return 1/1408.0;

            case 8:
                return 1/1.702;

            default:
                return -1;
        }   
            {
    public static String getUnitName (int unitNumber)
    {
        String value;
        switch (unitNumber)
        {
            case 1:
                value = "Meter";


            case 2:
                value = "Nautical mile";

            case 3:
                value = "Furlong";


            case 4: 
                value = "Mil";


            case 5:
                value = "Rod";


            case 6:
                value = "Vershok";


            case 7:
                value = "Sheppey";


            case 8:
                value = "Smoot";


            default:
                value = "faulty input";

        } 
        {
            public static void main (String[] args)

                Scanner input = new Scanner (System.in);

                System.out.println("Converting Measurements");
                System.out.println("By: Ashleigh Pacewicz");
                System.out.println("1.\tMeter");
                System.out.println("2.\tNautical Mile");
                System.out.println("3.\tFurlong");
                System.out.println("4.\tMil");
                System.out.println("5.\tRod");
                System.out.println("6.\tVershok");
                System.out.println("7.\tSheppey");
                System.out.println("8.\tSmoot");
                System.out.println("From what unit would you like to convert? ");
                int = input.nextInt();
                System.out.println("To what unit would you like to convert? ");
                int = input.nextInt();
                System.out.print("What measurement would you like to convert? ");
                double = input.nextDouble();
        }
    }
}

我正在学习如何编码。我正在尝试编写程序来转换仪表，但我在第40行和第63行以及第96行仍然收到错误。错误：

＆＃39;的.class＆＃39;预期

我做错了什么？

Answer 1

首先

 int = input.nextInt();
            System.out.println("To what unit would you like to convert? ");
            int = input.nextInt();

你没有给他们起个名字

看看你的大括号

 }   
        {
public static String getUnitName (int unitNumber)
{

每种方法都是一样的

应该是这样的

public void methodName() {

}

但你正在做这个

{
public void methodName()
{

你忘了休息;

你应该真正使用IDE

Answer 2

我想说实话。我不知道你为什么会收到这个错误...

我刚刚复制了你的代码并进行了编译。删除2到3个大括号并添加一个后，您的代码编译时没有错误。我确定你从其他地方得到了错误，你粘贴到了你的问题中。

您必须应用一些修正：

System.out.println("To what unit would you like to convert? ");
int NAME_YOUR_VARS = input.nextInt();

在一些地方，你会在方法标题的前面放置开括号：

{
public static double fromMeters(int unitNumber){

或者你忘了关闭方法身体：

public static String toMeters (int unitNumber) {

    switch(unitNumber) {
    /* case statements were cut out here*/
    }
//<- Here you forgot a brace!

跟踪代码块和支撑位置非常重要！

继续收到错误：'。class'预计第40行

2 个答案: