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Java Data Type Q&A
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Java Data Type Q&A » Integer » valueOf 

1. Why is Long.valueOf(0).equals(Integer.valueOf(0)) false?

This questions is prompted by I think I understand why Map<K,V>.put takes a K but Map<K,V>.get takes an Object, it seems not doing so will break too much existing code. ...

2. New Integer vs valueOf

I was using Sonar to make my code cleaner, and it pointed out that I'm using new Integer(1) instead of Integer.valueOf(1). Because it seems that valueOf does not instantiate ...

3. Java: (int)(float)Float.valueOf(s) or Float.valueOf(s).toInt()

I just bumped into this little problem and I wanted the input of other people on this I was wandering what was the best solution to convert a String to an int

(int)(float)Float.valueOf(s) ...

4. Why java.lang.Integer.valueOf is a flyweight pattern

Why java.lang.Integer.valueOf is a flyweight pattern? I tried to find the reason but couldn't able to.

5. Integer.valueOf() better than new Integer()

Possible Duplicate:
New Integer vs valueOf
I read at few place that Integer.valueOf is better than new Integer(), since it allows caching of values to be ...

6. Integer.valueOf() vs. Integer.parseInt()

Aside from Integer.parseInt() handling the minus sign (as documented), are there any other differences between Integer.valueOf() and Integer.parseInt()? And since neither can parse , as a decimal separator (produces NumberFormatException), is there ...

7. What is "Integer.valueOf().intValue()" supposed to do?

Here is a java line of code that i have failed to understand.

 String line = "Some data";//I understand this line
 int size;//I understand this line too

 size = Integer.valueOf(line,16).intValue();//Don't ...

8. new Integer vs Integer.valueOf

hi Matt, try the following code and review the results for different s[0] argument values. you will notice the difference. i am not sure about the reason but this what i observed. "for first for loop the time is higher than the second for loop". this might lead us to a conclusion that- new Integer() is slower than Integer.valueOf() actually, i ...

9. parseInt(String) or Integer.valueOf(s).intValue

OK, It's not 10am and I haven't had my first coffee of the morning but... Is there any advantage to using int val = Integer.valueOf(someNumberAsString).intValue(); as opposed to the more terse (single method invocation) int val = Integer.parseInt(someNumberAsString); I've tended to always use the latter. Oh, and I am using jdk1.3.1 and jdk1.4 and not assuming autoboxing (the new Java 5/Tiger ...

10. Integer decode() vs. valueOf()

Lalit, The difference between these two methods is that with the decode() method you can pass octal and hexadecimal strings in addition to decimal strings. The single parameter version of the valueOf() method only interprets strings representing signed decimal integers. For the decode() method, you pass radix specifiers such as "0x" or "#" for hex strings and "0" for octal strings. ...

12. Difference between 'new Integer(value)' and Integer.valueOf(value)

Hi, Since being told a few months ago on this forum to use Integer.valueOf(value) over a new Integer, as its more memory efficient I have been doing this. Most often when getting values indexed with ints from a Hashtable. I am just interested to know why this is a more preferable method, as valueOf returns an Integer object anyway. Thanks.

14. Integer.valueOf( int i ) vs. Integer.valueOf( String s )?

an inspection of the implementation ( 1.6.0_04 ) indicates that valueOf( int i ) and valueOf( String s ) differ in an interesting way. the former attempts to return an Integer from the internal cache, while the latter always constructs a new Integer after parsing. naively, one might expect valueOf( String s ) to parse to a primitive, then invoke valueOf( ...  | Contact Us | Privacy Policy
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