My code can't get the last value of else if statement in java

if((A>B) && (A>C)){
        System.out.println("The biggest number is     :  "+ A);
    }
    else if((B>A) && (B>C)){
        System.out.println("The biggest number is     :  "+ B);
    }
    else if((C>A) && (C>B)){
        System.out.println("The biggest number is     :  "+ C);
    }
    else{
        System.out.println("Wrong input!!!");
    }

In my code above, if I put the value of string, char, or boolean on the one of var. I will got an error massage instead of the "Wrong input!!!". The type of all data is integer, but why it return to error when I enter the other type of data. why the "Wrong input!!!" not appear?
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Sorry for my bad english
Just started to learn programming from java
so please forgive me if it's a dumb question
Thanks all...