java菜鸟疑问1：为什么我的代码总出现cannot be resolved or is not a field这种问题

如代码所示，求大佬解答这段代码的问题和解决方案是什么。

import java.util.Scanner;

public class RS {

	private static Object System;

	public static void main(String[] args) {
		int a,b,x;
		Scanner in=new Scanner(System.in);
		x=in.nextInt();
		if(x>=11&&x<=59)
		{
			a=x/10;
			b=x%10;
		switch(a)
		{
		case 1:
			System.out.println("Unreadable");
			break;
		case 2:
			System.out.println("Barely readable, occasional words distinguishable");
			break;
		case 3:
			System.out.println("Readable with considerable difficulty");
			break;
		case 4:
			System.out.println("Readable with practically no difficulty");
			break;
		case 5:
			System.out.println("Perfectly readable");
			break;		
		} 
		switch(b)
		{
		case 1:
			System.out.println("Faint signals, barely perceptible");
			break;
		case 2:
			System.out.println("Very weak signals");
			break;
		case 3:
			System.out.println("Weak signals");
			break;
		case 4:
			System.out.println("Fair signals");
			break;
		case 5:
			System.out.println("Fairly good signals");
			break;	
		case 6:
			System.out.println("Good signals");
			break;
		case 7:
			System.out.println("Moderately strong signals");
			break;	
		case 8:
			System.out.println("Strong signals");
			break;	
		case 9:
			System.out.println("Extremely strong signals");
			break;	
		} 
		
		}
	}

}