java - 我在 Java 中遇到错误：无法解析为变量

Question

我正在运行此代码并收到错误

System.out.print(name[i]+" ");
System.out.print(age[i]+" ");
System.out.print(country[i]+" ");

那

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    name cannot be resolved to a variable
    age cannot be resolved to a variable
    country cannot be resolved to a variable

我该如何解决这个问题？

public class AnyInteger
{
    public static void main(String arg[]) throws FileNotFoundException
   
 {
        int n = 0;
         
try {
        BufferedReader in = new BufferedReader(new FileReader("D:\\Java\\eclipse-workspace\\AnyInteger\\src\\file.txt"));
        
String str;

        while ((str = in.readLine())!= null) {
            String[] arr =str.split("#");
            n = arr.length;
            String name[] = new String[n];
            int age[] = new int[n];
            String country[] = new String[n];
            int i=0;
            while(i<n)
            {
                for(int j=0;j<3;j++)
                {
                    name[j] = arr[i];
                    i = i+1;
                    age[j] = Integer.parseInt(arr[i]);
                    i = i+1;
                    country[j] = arr[i];
                    i = i+1;
                }
            }
        }
        in.close();
    }

catch (IOException e) {
        System.out.println("File Read Error");
    }
  
    
    System.out.println("Names: ");
    for(int i=0;i<n;i++)
    {
        System.out.print(name[i]+" ");
    }
    
     System.out.println("Ages: ");
    for(int i=0;i<n;i++)
    {
        System.out.print(age[i]+" ");
    }
    
     System.out.println("Countries: ");
    for(int i=0;i<n;i++)
    {
        System.out.print(country[i]+" ");
    }
    
    }
}

标签： javaoop

Answer 1

您应该声明数组name[]，age[]并country[]在 try/catch 语句之外声明，while如果需要，只需在循环中实例化它。

像这样的东西：

public class AnyInteger
{
    public static void main(String arg[]) throws FileNotFoundException
   
 {
        int n = 0;
        String name[];
        int age[];
        String country[];
         
try {
        BufferedReader in = new BufferedReader(new FileReader("D:\\Java\\eclipse-workspace\\AnyInteger\\src\\file.txt"));
        
String str;

        while ((str = in.readLine())!= null) {
            String[] arr =str.split("#");
            n = arr.length;
            name = new String[n];
            age = new int[n];
            country = new String[n];
            int i=0;
            while(i<n)
            {
                for(int j=0;j<3;j++)
                {
                    name[j] = arr[i];
                    i = i+1;
                    age[j] = Integer.parseInt(arr[i]);
                    i = i+1;
                    country[j] = arr[i];
                    i = i+1;
                }
            }
        }
        in.close();
    }

catch (IOException e) {
        System.out.println("File Read Error");
    }
  
    
    System.out.println("Names: ");
    for(int i=0;i<n;i++)
    {
        System.out.print(name[i]+" ");
    }
    
     System.out.println("Ages: ");
    for(int i=0;i<n;i++)
    {
        System.out.print(age[i]+" ");
    }
    
     System.out.println("Countries: ");
    for(int i=0;i<n;i++)
    {
        System.out.print(country[i]+" ");
    }
    
    }
}