View Compilation Error

0_0_39043627_1085\Main.java:1: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_39043627_1085\Main.java:4: 错误: 需要class, interface或enum
    while(in.hasNext()) {
    ^
0_0_39043627_1085\Main.java:6: 错误: 需要class, interface或enum
        double y1 = in.nextDouble();
        ^
0_0_39043627_1085\Main.java:7: 错误: 需要class, interface或enum
        double x2 = in.nextDouble();
        ^
0_0_39043627_1085\Main.java:8: 错误: 需要class, interface或enum
        double y2 = in.nextDouble();
        ^
0_0_39043627_1085\Main.java:9: 错误: 需要class, interface或enum
        DecimalFormat decimalFormat = new DecimalFormat(".00");
        ^
0_0_39043627_1085\Main.java:10: 错误: 需要class, interface或enum
        System.out.println(decimalFormat.format(Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2))));
        ^
0_0_39043627_1085\Main.java:11: 错误: 需要class, interface或enum
    }
    ^
8 个错误