Linked Questions

Integer comparison in Java is tricky, in that int and Integer behave differently. I get that part. But, as this example program shows, (Integer)400 (line #4) behaves differently than (Integer)5 (line ...

as far as I understand due to Java autoboxing I can do this: Integer i = 10; Integer j = 10; boolean b = i == j; Or this: int ii = 10; int jj = 10; Integer i = ii; Integer j = jj; boolean b = i == j;...

class D { public static void main(String args[]) { Integer b2=128; Integer b3=128; System.out.println(b2==b3); } } Output: false class D { public static void main(...

I'm a newbie Java coder and I just read a variable of an integer class can be described three different ways in the API. I have the following code: if (count.compareTo(0)) { System.out....

Map<String,Integer> m; m = new TreeMap<String,Integer>(); Is it good practice to add the following cast just to avoid the null pointer exception when m.get() is null. System.out.println( (...

The following code seemed really confusing to me since it provided two different outputs.The code was tested on jdk 1.7. public class NotEq { public static void main(String[] args) { ver1(); ...

I know that i am comparing reference while i'm using == which is not a good idea but i did not understand why is this happening. Integer a=100; Integer b=100; Integer c=500; Integer d=500; System.out....

As we know that == in case of Objects returns true if pointing to the same reference else it returns false. So , if i have taken Integer a = new Integer("1"); // Creating Integer Object a ...

I know int range is -2147483648 to +2147483647 but here I'm getting output as true and false. Why? Actually i1 and i2 point to the same object, so output is true. I can understood but i3 and i4 also ...

This is classical, but writing to Google did not give me hits. My code: Integer i = ..; // Sth is put from database. if (i != 1) { // do sth } else { // do not. } Case: I know that this ...

"Birthday Cake Candles" is the name of this problem in HackerRank This is the working code and if I replace "int" with "Integer" it is not working. It is working for all ...