#Java 7, (削除) 121 (削除ここまで) 118 bytes

void f()throws Exception{for(int k=0;;k++){System.out.print("\rLoading... 
"+"|/-\\".charAt(k%=4));Thread.sleep(250);}}

Gif animation:

enter image description here

Java 7, (削除) 121 (削除ここまで) 118 bytes

void f()throws Exception{for(int k=0;;k++){System.out.print("\rLoading... 
"+"|/-\\".charAt(k%=4));Thread.sleep(250);}}

Gif animation:

enter image description here