System.out.println错误新程序员

Question

我试图做一个简单的输入程序，我得到了一个错误的System.out.println命令，我不知道为什么它不接受这个命令，不能继续工作，直到我修复它。

错误说：

Multiple markers at this line
    - Syntax error, insert ")" to complete MethodDeclaration
    - Syntax error, insert "Identifier (" to complete 
     MethodHeaderName
    - Syntax error on token ".", @ expected after this token
    - Syntax error, insert "SimpleName" to complete QualifiedName

我的代码如下。

package classPack;

import java.util.Scanner;

public class Main {     
    Scanner s = new Scanner(System.in);
    int numone = s.nextInt();
    System.out.println("please input the number of numbers you want to analyze");
    Scanner r = new Scanner(System.in);
    int numtwo = s.nextInt();
}

Answer 1

试试这个：

public class Main {  
    public static void main(String[] args) {       
        // you only need one instance of scanner
        Scanner s = new Scanner(System.in);
        int numone = s.nextInt();
        System.out.println("please input the number of numbers you want to analyze");
        int numtwo = s.nextInt();
        // don't forget to close the scanner
        s.close();    
    }
}

在Java中，必须将代码放在方法中，而不是在类级别。特别是，您可以将其放入main()方法中，该方法是执行所有程序的入口点。

Answer 2

您缺少something.....but，您可以尝试以下“用户输入”代码

import java.util.Scanner;
public class test {     
public static void main(String args[])
{
Scanner s = new Scanner(System.in);
int numone = s.nextInt();
System.out.println("please input the number of numbers you want to analyze");
Scanner r = new Scanner(System.in);
int numtwo = s.nextInt();
}

}

Answer 3

import java.util.Scanner;

class Multi {
  public static void doSomething() {
    Scanner s = new Scanner(System.in);
    int numone = s.nextInt();
    System.out.println("please input the number of numbers you want to analyze");
    Scanner r = new Scanner(System.in);
    int numtwo = s.nextInt();
    }
  }
}

public class MultiplicationTable {
  public static void main(String[] args) {
    Multi.doSomething();
  }
}