improt *;
public class CompIf{
pubic static void main(String args[]) throws IOException{
 int a,b,c,t;
 String str;
 BufferedReader buf;
 buf=new BufferedReader(new InputStreamReader(System.in));
 System.out.print("input sirst number:");
 str=buf.readLine();
 a=Integer.parseInt(str);
 System.out.print("input second number:");
 str=buf.readline();
 b=Integer.parseInt(str);
 System.out.print("input third number:");
 str=buf.readline();
 a=Integer.parseInt(str);
 if (a>b)
   {t=a;a=b;b=t;}
 if (a>c)
   {t=a;a=c;c=t;}
 if (b>c)
   {t=b;b=c;c=t;}
  System.out.print(a+",");
  System.out.print(b+",");
  System.out.print(c+",");
   
}
}
jdk8下调试
误在1、3行