View Compilation Error

0_0_31361370_18918\Main.java:1: 错误: 需要class, interface或enum
public static void main (String [] args ){
              ^
0_0_31361370_18918\Main.java:4: 错误: 需要class, interface或enum
        int x1,y1,x2,y2; 
        ^
0_0_31361370_18918\Main.java:5: 错误: 需要class, interface或enum
int x1=sc.nextInt();
^
0_0_31361370_18918\Main.java:6: 错误: 需要class, interface或enum
	int y1=sc.nextInt();
	^
0_0_31361370_18918\Main.java:7: 错误: 需要class, interface或enum
	int x2=sc.nextInt();
	^
0_0_31361370_18918\Main.java:8: 错误: 需要class, interface或enum
	int y2=sc.nextInt();
	^
0_0_31361370_18918\Main.java:9: 错误: 需要class, interface或enum
	int jl=(y1-y2)/(x2-x1);
	^
0_0_31361370_18918\Main.java:10: 错误: 需要class, interface或enum
	system.out.println(""+jl);
	^
0_0_31361370_18918\Main.java:12: 错误: 需要class, interface或enum
 }
 ^
9 个错误