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java Programming Glossary: autoboxing

How to convert int[] into List<Integer> in Java?

http://stackoverflow.com/questions/1073919/how-to-convert-int-into-listinteger-in-java

is not part of Java. java collections boxing autoboxing share improve this question There is no shortcut for converting..

When comparing two Integers in Java does auto-unboxing occur?

http://stackoverflow.com/questions/1514910/when-comparing-two-integers-in-java-does-auto-unboxing-occur

that case What about Integer a 4 Integer b 5 if a 5 java autoboxing share improve this question No between Integer Long etc will..

Why does 128==128 return false but 127==127 return true in this code?

http://stackoverflow.com/questions/1700081/why-does-128-128-return-false-but-127-127-return-true-in-this-code

127 This line of code is also generated when you use autoboxing. valueOf is implemented such that certain numbers are pooled..

Is it guaranteed that new Integer(i) == i in Java?

http://stackoverflow.com/questions/2831945/is-it-guaranteed-that-new-integeri-i-in-java

performed which would all then be false java comparison autoboxing implicit conversion share improve this question Yes. JLS..

Why does int num = Integer.getInteger(“123”) throw NullPointerException?

http://stackoverflow.com/questions/3123349/why-does-int-num-integer-getinteger123-throw-nullpointerexception

thanks. java integer nullpointerexception api design autoboxing share improve this question The Big Picture There are two.. between an int and an Integer in Java C# Why does autoboxing in Java allow me to have 3 possible values for a boolean Is..

Weird Integer boxing in Java

http://stackoverflow.com/questions/3130311/weird-integer-boxing-in-java

the second statement returning true Is there some strange autoboxing rule that kicks in when an Integer's value is in a certain range.. value is in a certain range What's going on here java autoboxing share improve this question The true line is actually guaranteed..

java: Integer equals vs. ==

http://stackoverflow.com/questions/3637936/java-integer-equals-vs

answered my original question but because I didn't mention autoboxing in my question it didn't show up in the selected suggestions.. selected suggestions Why can't the compiler JVM just make autoboxing 穅ust work java integer wrapper primitive equals operator ..

Java Array, Finding Duplicates

http://stackoverflow.com/questions/3951547/java-array-finding-duplicates

way Here's a hash based approach. You gotta pay for the autoboxing but it's O n instead of O n 2 . An enterprising soul would go..

Why do people still use primitive types in Java?

http://stackoverflow.com/questions/5199359/why-do-people-still-use-primitive-types-in-java

there any tangible benefit java primitive primitive types autoboxing jdk1.5 share improve this question In Joshua Bloch's Effective..

Tricky ternary operator in Java - autoboxing

http://stackoverflow.com/questions/8098953/tricky-ternary-operator-in-java-autoboxing

ternary operator in Java autoboxing Let's look at the simple Java code in the following snippet.. error Why java nullpointerexception conditional operator autoboxing inconsistency share improve this question The compiler interprets.. null as a null reference to an Integer applies the autoboxing unboxing rules for the conditional operator as described in..

EL access a map value by Integer key

http://stackoverflow.com/questions/924451/el-access-a-map-value-by-integer-key

As mentioned in this java forum thread Basically autoboxing puts an Integer object into the Map. ie map.put new Integer.. used for keys in a map. Specifically the issue relates to autoboxing by java using map.put 1 MyValue and attempting to display it.. in the map. Attempting to access the entry created by autoboxing fails because a Long is never equal to an Integer p lifeInteger..

Inconsistent behavior on java's ==

http://stackoverflow.com/questions/1148805/inconsistent-behavior-on-javas

java integer primitive share improve this question Autoboxing of primitives into objects as used in your calls to method uses..

autoboxing vs manual boxing java

http://stackoverflow.com/questions/2307904/autoboxing-vs-manual-boxing-java

Double j java autoboxing share improve this question Autoboxing uses Integer.valueOf which internally caches Integer objects..

Why can Java Collections not directly store Primitives types?

http://stackoverflow.com/questions/2504959/why-can-java-collections-not-directly-store-primitives-types

They are implementation detail leaking into the language. Autoboxing is nice syntactic sugar but is still a performance penalty nonetheless...

When to use primitive and when reference types in Java

http://stackoverflow.com/questions/2509025/when-to-use-primitive-and-when-reference-types-in-java

from primitives to its wrapper class and vice versa Autoboxing will turn 1 2 3 into Integers from ints. List Integer numbers..

Is it possible to pass arithmetic operators to a method in java?

http://stackoverflow.com/questions/2902458/is-it-possible-to-pass-arithmetic-operators-to-a-method-in-java

Invalid operator See also Java Language Guide Autoboxing Java Lessons Exceptions Coding Conventions Naming Unfortunate..

Why does autoboxing in Java allow me to have 3 possible values for a boolean?

http://stackoverflow.com/questions/2923249/why-does-autoboxing-in-java-allow-me-to-have-3-possible-values-for-a-boolean

and faster. If you must use boxed primitives be careful Autoboxing reduces the verbosity but not the danger of using boxed primitives..

Java noob: generics over objects only?

http://stackoverflow.com/questions/3015716/java-noob-generics-over-objects-only

type instantiations incurs a performance penalty. Autoboxing and unboxing make the use of wrapper type instantiations of.. Prefer primitive types to boxed types Java Language Guide Autoboxing Java Language Guide Generics Java Tutorials Generics share..

Why does int num = Integer.getInteger(“123”) throw NullPointerException?

http://stackoverflow.com/questions/3123349/why-does-int-num-integer-getinteger123-throw-nullpointerexception

Integer.parseInt String . References Java Language Guide Autoboxing Integer API references static int parseInt String static Integer.. and faster. If you must use boxed primitives be careful Autoboxing reduces the verbosity but not the danger of using boxed primitives...

Why comparing Integer with int can throw NullPointerException in Java?

http://stackoverflow.com/questions/3352791/why-comparing-integer-with-int-can-throw-nullpointerexception-in-java

and faster. If you must use boxed primitives be careful Autoboxing reduces the verbosity but not the danger of using boxed primitives... throws a NullPointerException Java Language Guide Autoboxing JLS 15.21.1 Numerical Equality Operators and JLS 15.21.3 Reference..

Why Java does not see that Integers are equal?

http://stackoverflow.com/questions/4428774/why-java-does-not-see-that-integers-are-equal

and hashCode in here. See also Introduction to autoboxing Autoboxing pitfalls when comparing numbers with a share improve this..

Get the indices of an array after sorting?

http://stackoverflow.com/questions/4859261/get-the-indices-of-an-array-after-sorting

array.length for int i 0 i array.length i indexes i i Autoboxing return indexes @Override public int compare Integer index1..

Java -> Python?

http://stackoverflow.com/questions/49824/java-python

int long Object short . Array.sort is a good example. Autoboxing helps although it makes things awkward when something turns..

Autoboxing: So I can write: Integer i = 0; instead of: Integer i = new Integer(0);

http://stackoverflow.com/questions/766468/autoboxing-so-i-can-write-integer-i-0-instead-of-integer-i-new-integer0

So I can write Integer i 0 instead of Integer i new Integer.. can write Integer i 0 instead of Integer i new Integer 0 Autoboxing seems to come down to the fact that I can write Integer i 0.. question You kind of simplified it a little too much. Autoboxing also comes into play when using collections. As explained in..