autoboxing

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The expression of type x is boxed into X?

I\'m a little confused by a warning that my Eclipse IDE is currently writing next to every expression where types are autoboxed or autounboxed:[详细]

2023-02-11 15:21 分类：问答
Java Arrays.asList on primitive array type produces unexpected List type [duplicate]

This question already has answers here: Closed 12 years ago. Possible Duplicate: Arrays.asList() not working as it should?[详细]

2023-02-03 02:05 分类：问答
Why I can't use Comparator to sort primitives?

As Java 5 have autoboxing, why I can\'t use Comparator to sort primitiv开发者_如何学Goes? An int wouldn\'t be wrapped into a Integer?Arrays.sort(..) have dedicated overloadings for sorting primitive a[详细]

2023-02-01 22:05 分类：问答
Wrappers of primitive types in arraylist vs arrays

In \"Core java 1\" I\'ve read CAUTION: An ArrayList is far less efficient than an int[] array because each value is separately[详细]

2023-02-01 11:50 分类：问答
Where do you put the parentheses to concisely convert a casted object to a primitive type without auto-unboxing?

With autounbox开发者_高级运维ing, this statement will automatically work: int myPrimitive = (Integer) doIt();[详细]

2023-01-19 08:44 分类：问答
Why do I get null pointer exception in this code?

public class Test { Integer i; int j; public static void main ( String [] args ) { Test t = new Test (); t.go();[详细]

2023-01-19 00:16 分类：问答
Autoboxing/widening occurs in Short a=3 but not in Float a=3;

I understand that the following code won\'t work Float a=3 because its translated as Float a=Integer.valueOf(3). We\'ll have a Float reference on the LHS and an Integer object on the RHS, which is[详细]

2023-01-16 00:46 分类：问答
Performance impact of autoboxing

Usually the compiler generates code to perform boxing and unboxing. But what does the compiler, if the boxed values are not needed? Is the (Oracle standard) compiler smart enough to optimize it away?[详细]

2023-01-10 10:45 分类：问答
Java question about autoboxing and object equality / identity [duplicate]

This question already has answers here: Weird Integer boxing in Java (12 answers) Closed 6 years ago. public class Main {[详细]

2023-01-09 09:24 分类：问答
NullPointerException with autoboxing in ternary expression

Run the fo开发者_运维技巧llowing Java code: boolean b = false; Double d1 = 0d; Double d2 = null; Double d = b ? d1.doubleValue() : d2;[详细]

2023-01-08 03:28 分类：问答