View Compilation Error

0_0_19094797_8215\Main.java:1: 错误: 需要class, interface或enum
	public static void main(String[] args) {
	              ^
0_0_19094797_8215\Main.java:3: 错误: 需要class, interface或enum
	double PI=3.1415927;
	^
0_0_19094797_8215\Main.java:4: 错误: 需要class, interface或enum
	while(sc.hasNext()){
	^
0_0_19094797_8215\Main.java:6: 错误: 需要class, interface或enum
		 double vol=PI*r*r*r*4/3;
		 ^
0_0_19094797_8215\Main.java:7: 错误: 需要class, interface或enum
		 DecimalFormat df=new DecimalFormat("#.000");
		 ^
0_0_19094797_8215\Main.java:8: 错误: 需要class, interface或enum
		 System.out.println(df.format(vol));
		 ^
0_0_19094797_8215\Main.java:10: 错误: 需要class, interface或enum
	}
	^
7 个错误