“扫描仪无法解析为一种类型”我该如何解决？

Question

I am taking an online course to learn java and currently we are learning "Getting User Input". this is what ive started with so far...

public class mama {
    public static void main(String[] args) {        
        Scanner input;
    }
}

however it keeps saying "Scanner input;"

what do i do?

Answer 1

 import java.util.Scanner;
 public class mama{
 public static void main(String[] args) {

 Scanner sc= new Scanner(System.in); 
 System.out.print("Enter input value ");  
 int a = sc.nextInt();  
   }
}

you can get input from the user just like this in your main function.

Answer 2

You have not assigned any value to the scanner variable, the first step to using a scanner is importing the library, then assigning the scanner a variable like "sc" or "keyboard" (which I use), then assign something the scanner variable.

Step by step breakdown:

You are missing:

import java.util.Scanner; 

This is the first step, always remember

Then do this:

Scanner sc = new Scanner(System.in);

Lastly, assign the "sc" to something, either a string or Int variables.

For example:

int number = sc.nextInt();

or:

String x = sc.next();

Note: You need to understand what the scanner variables are for every type of variable you assign for example string or Int.

For String it is:

sc.next();

For Int:

sc.nextInt();

Same goes for double, float...etc, just change the Int to what you want

In the end, your code should look something like this:

import java.util.Scanner;
public class mama {
public static void main(String[] args) {        
    Scanner sc = new Scanner(System.in);
    System.out.print("Enter desired input");
    int input = sc.nextInt();
    }
}