Question

while( i <= j && i >= j && i != j) {}

how to declare i and j to make it be an infinite loop ?

// it’s an interview question I met.

it’s asking what’s the declarations of i and j, make it be always true.

And I cant make it out by declaring i and j as number types. What other types can meet it ?

Answer 1

Integer i=new Integer(1000);
Integer j=new Integer(1000);

System.out.println((i<=j)+" "+(i>=j)+" "+(i!=j));

i and j will be automatically unboxed to ints for <= and >=, but not for !=. i and j are different instances, but have the same int value. That’s why all three comparisons will return true.