View Compilation Error

0_0_30852206_4994\Main.java:2: 错误: 需要class, interface或enum
    public static void main(String[]args){
                  ^
0_0_30852206_4994\Main.java:4: 错误: 需要class, interface或enum
    System.out.println("输入两点:");
    ^
0_0_30852206_4994\Main.java:5: 错误: 需要class, interface或enum
    int x1 = sc.nextInt();
    ^
0_0_30852206_4994\Main.java:6: 错误: 需要class, interface或enum
    int x2 = sc.nextInt();
    ^
0_0_30852206_4994\Main.java:7: 错误: 需要class, interface或enum
    int y1 = sc.nextInt();
    ^
0_0_30852206_4994\Main.java:8: 错误: 需要class, interface或enum
    int y2 = sc.nextInt();
    ^
0_0_30852206_4994\Main.java:9: 错误: 需要class, interface或enum
    int a = x1-x2, b = y1-y2;
    ^
0_0_30852206_4994\Main.java:10: 错误: 需要class, interface或enum
    double c = Math.sqrt(a*a+b*b);
    ^
0_0_30852206_4994\Main.java:11: 错误: 需要class, interface或enum
    System.out.println("两点距离:"+c); 
    ^
0_0_30852206_4994\Main.java:12: 错误: 需要class, interface或enum
}
^
10 个错误