autoboxing

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Initializing a Double object with a primitive double value

What is happening when a java.lang.Double object is initialized without using a call to the constructor but instead using a primitive?It appears to work but I\'m not quite sure why.Is there some kind[详细]

2023-01-07 21:18 分类：问答
Is this generic autoboxing?

Assigning values without using usual notation like \"this.<D开发者_Python百科ouble>getAnything(int flag)\"[详细]

2023-01-06 12:52 分类：问答
Why does int num = Integer.getInteger("123") throw NullPointerException?

The following code throws NullPointerException: int num = Int开发者_运维问答eger.getInteger(\"123\");[详细]

2023-01-05 06:42 分类：问答
Weird Integer boxing in Java

I just saw开发者_StackOverflow中文版 code similar to this: public class Scratch { public static void main(String[] args)[详细]

2023-01-05 02:49 分类：问答
Why does autoboxing in Java allow me to have 3 possible values for a boolean?

Reference: http://java.sun.com/j2se/1.5.0/docs/guide/language/autoboxing.html \"If your program tries to autounbox null, it will throw a NullPointerException.\"[详细]

2023-01-01 21:00 分类：问答
Object or primitive type

Can someone explain to me the usage of Integer, Boolean etc in place of their primitive types in JAVA?[详细]

2022-12-31 18:20 分类：问答
Is it guaranteed that new Integer(i) == i in Java?

Consider the following snippet: int i = 99999999; byte b = 99; short s = 9999; Integer ii = Integer.valueOf(9); // should be within cache[详细]

2022-12-30 11:22 分类：问答
Auto-(un)boxing fail for compound assignment

Thanks to the implicit casting in compound assignments and increment/decrement operators, the following compiles:[详细]

2022-12-28 14:13 分类：问答
Why can't the compiler/JVM just make autoboxing "just work"?

Autoboxing is rather scary.While I fully understand the difference between == and .equals I can\'t but help have the follow bug the hell out of me:[详细]

2022-12-25 22:22 分类：问答
java.lang.Object o = 1;//why does this compile?

I was doing one of these online Java tests and I was asked this question: Q: Indicate correct assignment:[详细]

2022-12-21 21:57 分类：问答