(a==b==2)!=(a==2 && b==2)

Once I get value of variable a and variable b ,their value are both 2.And I want to judge whether they are equal.I make a mistake for using if(a==b==2).It is wrong.Because a==b is true and then the result compares to 2 will get false.(1!=2)
So I should write like this: if(a==2 && b==2).