A、if(a=2)System.out.println(a);
if(a==2)System.out.println(a);
B、if(a-2)System.out.println(a);
if(a==2)System.out.println(a);
C、if(a)System.out.println(a);
if(a==0)System.out.println(a);
D、if(a-2!=0)System.out.println(a);
if(a!=2)System.out.println(a);
D