System.out.println error New programmer

Question

我正在尝试做一个简单的输入程序，但在System.out.println命令上出现错误，我不知道为什么它不接受该命令并且无法继续工作，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，您可以将其放在 main() 方法中，该方法是执行所有程序的入口点。

Answer 2

你错过了一些东西.....但你可以试试这个"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();
  }
}

Answer 4

public class Animal {
    public String name;
    public static int nosLegs;

    public Animal(){
    }
    public Animal(String name, int nosLegs) {
        super();
        this.name = name;
        this.nosLegs = nosLegs;
    }

    //getter and setter
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    public int getNosLegs() {
        return nosLegs;
    }
    public void setNosLegs(int nosLegs) {
        this.nosLegs = nosLegs;
    }

    public class B{

        public int b;
        System.out.println("hello");
    }

}
change in Main method...