Double Literally Result False

Asked Feb 28 '19 at 04:56

Active Feb 28 '19 at 05:08

Viewed 32 times

My Question about Wrapper classes. Case 1: I'm Declaring two Integer variables and assigning same values 127, and i'm printing both hashCode. It's Generated same hashCode and result will be printed true. But In Case 2: Generated the Same hashCode but result will be printing false. Please Could you relate. Why Printing a false result.

package com.oca.test.exam;

public class TestCasesIntegerAndDouble {

    public static void main(String[] args) {

        //Case 1:
        Integer i1 = 127;
        Integer i2 = 127;

        System.out.println(i1.hashCode()); //127
        System.out.println(i2.hashCode()); //127
        System.out.println(i1 == i2); //true

        //Case 2:
        Double d1 = 127.0;
        Double d2 = 127.0;

        System.out.println(d1.hashCode());//1080016896
        System.out.println(d2.hashCode());//1080016896
        System.out.println(d1 == d2); //false
    }
}

asked Feb 28 '19 at 04:56

Ng Sharma

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@Shmosel Your question is different. Please Read First My Question Then Mark Duplicate. – Ng Sharma Feb 28 '19 at 05:06
The question is a little different, but the answer is the same. – shmosel Feb 28 '19 at 05:25
i know that integer cases but i'm talking about Case 2:. – Ng Sharma Feb 28 '19 at 05:33
See the second link. – shmosel Feb 28 '19 at 05:34
i already check the second link but second link is talking only Integer type. Not Double Type case. – Ng Sharma Feb 28 '19 at 05:41
It's the same thing. – shmosel Feb 28 '19 at 05:42
I know that Integer Case. Integer pool lie between -128 to 127; – Ng Sharma Feb 28 '19 at 05:42
Is Not Same Thing I See The Integer Api valueOf() Method : http://www.docjar.com/html/api/java/lang/Integer.java.html – Ng Sharma Feb 28 '19 at 05:44
Double Api http://www.docjar.com/html/api/java/lang/Double.java.html – Ng Sharma Feb 28 '19 at 05:45
if you say that, is a same thing. then Why Case2 is False. Because I'm entering the number between -128 to 127 .When result is printing false. – Ng Sharma Feb 28 '19 at 05:51
There's no cache for Double, only Integer. – shmosel Feb 28 '19 at 05:52
public static void main(String arg[]) { Integer x = 1000; long y = 1000; Integer z = 1000; System.out.println(x==y); //true doubt in this place System.out.println(x==z); //false this statement not lie -128to127. it okay } – Ng Sharma Feb 28 '19 at 06:25
Is that a question? – shmosel Feb 28 '19 at 08:48
yes this a question – Ng Sharma Feb 28 '19 at 11:28
And the question is? – shmosel Feb 28 '19 at 17:35

Double Literally Result False

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