第六行大括号总是显示不对

import java.util.Scanner;
public class Scratch {
public static void main(String[] args) {
Scanner a = new Scanner(System.in);
int b = a.nextInt();
switch(week) {
case1:
System.out.println("星期一");
break;
case2:
System.out.println("星期二");
break;
case3:
System.out.println("星期三");
break;
case4:
System.out.println("星期四");
break;
case5:
System.out.println("星期五");
break;
case6:
System.out.println("星期六");
break;
case7:
System.out.println("星期日");
break;
default:
System.out.println("你输入是星期有误");
break;
}
}
}

case和数字之间要有空格
而且你好像也没定义week

class Scratch {
    public static void main(String[] args) {
        Scanner a = new Scanner(System.in);
        int b = a.nextInt();
        switch (week) {
            case 1:
                System.out.println("星期一");
                break;
            case 2:
                System.out.println("星期二");
                break;
            case 3:
                System.out.println("星期三");
                break;
            case 4:
                System.out.println("星期四");
                break;
            case 5:
                System.out.println("星期五");
                break;
            case 6:
                System.out.println("星期六");
                break;
            case 7:
                System.out.println("星期日");
                break;
            default:
                System.out.println("你输入是星期有误");
                break;
        }
    }
}