View Compilation Error

0_0_15095906_30990\Main.java:2: 错误: 需要class, interface或enum
public static void main(String[] args) {
              ^
0_0_15095906_30990\Main.java:5: 错误: 需要class, interface或enum
		double r,v,pi;
		^
0_0_15095906_30990\Main.java:6: 错误: 需要class, interface或enum
		pi=3.1415927;
		^
0_0_15095906_30990\Main.java:7: 错误: 需要class, interface或enum
		r=kb.nextDouble();
		^
0_0_15095906_30990\Main.java:8: 错误: 需要class, interface或enum
		v=pi*r*r*r*4.0/3;
		^
0_0_15095906_30990\Main.java:9: 错误: 需要class, interface或enum
		System.out.printf("%.3f",v);
		^
6 个错误