compare « Integer « Java Data Type Q&A

1. How do I compare strings in Java?    stackoverflow.com

I've been using the "==" operator in my program to compare all my strings so far. However, I ran into a bug, changed one of them into .equals() instead, and it fixed ...

2. What's wrong with using == to compare floats in Java?    stackoverflow.com

According to this java.sun page == is the equality comparison operator for floating point numbers in Java. However, when I type this code:

        ...

3. How do I compare two Integers?    stackoverflow.com

This sounds like a stupid question, but I'm kinda stuck here. I have to compare two Integer (not int). How do I compare them?

Integer x = ...
Integer y = ...

4. Java: String compare library that returns diff count as an int?    stackoverflow.com

Does a library or even standard API call exist that allows me to diff two strings and get the number of diff chars as an int? I wouldn't mind other features, ...

5. Comparison between variables pointing to same Integer object    stackoverflow.com

The ourput of current program is "Strange". But the both the variables share the same reference why are second and thrid comparison not true.

Integer a;
Integer b;
a = new Integer(2);
b = a;
if(b ...

6. Why comparing Integer with int can throw NullPointerException in Java?    stackoverflow.com

It was very confusing to me to observe this situation:

Integer i = null;
String str = null;

if (i == null) {   //Nothing happens
   ...     ...

7. Compare int and Object in Java    stackoverflow.com

I have the following code:

Object obj = 3;
//obj.equals(3); // so is this true?

8. Comparing Integer objects vs int    stackoverflow.com

I fixed an endless loop by changing Integer to int in the following:

public class IntTest {
    public static void main(String[] args) {
       ...

9. Compare two strings of ints in java    stackoverflow.com

Hi I have two Strings that contain numbers and I want to see if the string two contains the same numbers as string one is there any way and they are ...

10. comparison if statment should be called twice but it is only called once when comparing an Integer    stackoverflow.com

I have a function that takes a Integer array and a boolean array. If the value in the Integer array is the highest value and the boolean array is true, ...

11. Initializing and comparing integers    stackoverflow.com

Besides the syntax, is there a difference (performance, semantics, etc.) between these two ways to initialize Integers?

Integer i = new Integer(10);
Integer i = Integer.valueOf(10);

12. How come Java's Integer class does not have compare() method?    stackoverflow.com

Double has Double.compare for comparing two double primitives. Why doesn't Integer have one? I understand it's some trivial amount of code to write, but asking out of curiosity. Edit: I realize both Integer ...

13. compare two Integer    stackoverflow.com

Possible Duplicate:
Wrapper class and == operator

14. { int == nulltype } vs. { Integer == nulltype }    stackoverflow.com

Why java complains about

// int i;
if( i == null ){  }

// Integer i;
if( i == null ){  }

15. Comparing three integer values    stackoverflow.com

Is something like this ever possible?

if(a == b == c)

if((a== b) && (b == c)) 

16. Compare Mutiple Integers and find largest in java    stackoverflow.com

I am kind of new to java, and I am making a MAbovePixel Generator. Right now my idea is that the very top pixels, and the very right pixels are blue, ...

17. Why doesn't my compare work between char and int in Java?    stackoverflow.com

Possible Duplicate:
Comparing Character, Integer and similar types in Java: Use equals or ==?

char c = data.charAt(4);
System.out.println(c + "-" + s);
if (c == s) { ...

18. a simple int comparison causing issue    stackoverflow.com

I've got the following code:

 int bookingType=0;
        //mapSize=mapLoaded.size();

        DateTime startx = new DateTime(startDate.getTime());
     ...

19. Comparing integers    coderanch.com

I need to compare a 'rank' score of speech competitors in my program the following code alphabatises the names of the people for ( int sc=1; sc

20. How to compare String and int?    coderanch.com

Hi, How do we write a code that does this: a) if the user key-in any number from 0 to 100, it will loop and perform some task. b) if the user key-in any number less than 0 or more than 100, it will prompt the user to re-enter the correct number. c) if the user type-in "quit", it will exit ...

21. Compare String with Integer    coderanch.com

Well, it is like a question of comparing an orange and an apple. You can't compare them if you don't give specific criteria. If you want to compare their integer values, then you should convert the string to integer before comparing as you did with proper error handling (i.e. when the string is not an integer). If you want to compare ...

22. Comparing Integer and Long    coderanch.com

ALL compile ok, and give the right result. So why is equality "==" incomparable, but >, <, >=, <= are comparable? When you compare with the == operator, the compiler is assuming that you are trying to compare whether the references are pointing to the same instance. And since there is no way that a Long reference can point to something ...

23. Comparing ints    coderanch.com

24. Comparison of 2 Integer values with "=="    coderanch.com

25. compare the remaining of Strings for equality    java-forums.org

26. How to compare the String with integer    java-forums.org

27. unable to compare strings and ints    java-forums.org

Hi everyone. I'm trying to compare ints and strings for a networked java application, System.out.println("here") won't print, evern when todo = 1. At a loss. Rob. Java Code: public static void NetLoad(int todo) { int x[] = new int[4]; int y[] = new int[4]; Ships.clear(); String[] sArray = new String[3]; System.out.println("todo = " + todo); try { System.out.println("start cc"); if (todo ...

28. Integer Comparison, Outputting Largest Integer Not Working    java-forums.org

I'm writing a Java program to take three integers and output the smallest, largest, sum, and average. Everything works except for finding the highest integer. If I set number1 to 1 and number2 to 2 and number3 to 3, the program outputs 2 as largest. If I do it in this order 3, 1, 2, it puts out 3 as the ...

29. Comparing String to Int variable    java-forums.org

30. comparing equality between 2 strings using '=='    forums.oracle.com

Compile-time strings are allocated from the constants pool - so, in your example, both 'a' and 'b' really are references to the same entity, and '==' works. In the second case, you're allocating new objects, each of which has the content - but they're different entities, and == returns false. Does that help? Grant

31. comparing long to int    forums.oracle.com

32. the detail about compare to Integers.    forums.oracle.com

In first case, both n1 and n2 refer to the same Integer instance. I don't know how ++ operator behaves in conjunction with autoboxing, but Integer objects are immutable (just like String) In second case, n1 and n2 are different instances of integer representing the same value. Therefore == will return false. You should always use the equals method to compare ...

33. Help with comparing integers, I'm completely baffled.    forums.oracle.com

Heh, I just had a meeting where I announced that putting the opening curly on the same line was being added to our coding standards. I figured if the morons who insist on coding java in Vi can have standards on no tabs and 80 chr hard line length limits then I could sneak one in that is actually useful and ...

34. Integer comparison with null problem    forums.oracle.com

35. STRING vs INTEGER Comparison!    forums.oracle.com

== compares primtives or reference values. When you do str1 == str2 on reference variables, the == is true if and only if both references point to the same object, or both are null (pointing to no object). If you want to compare objects' states, (including Strings' contents), use the equals method. This method will compare the objects' "contents" by whatever ...

36. how to compare String and integer    forums.oracle.com

just wanna ask some help guys, how to compare String data type from int and vice versa. im doing a program that i will input a number and convert it in words. my problem is how can i make it an error when the input is a letter. pls email me at pdequito@hotmail.com thankzzzz

37. comparing 2 Integer objects...    forums.oracle.com

Hi, For object comparision use equals() method instead of ==. == compares whether the 2 references are equal or not. In your case, There is one intresting thing with == comparision of wrapper objects. It is for Integer,Long,Short,Char if the value you assign to wrapper class is in between -128 <= object value <=127, then == comparision results in true. and ...

38. comparing two Integer lists    forums.oracle.com

39. Comparing integer ranges in java    forums.oracle.com

40. comparing a single int to more than one int value?    forums.oracle.com

Well, think about it. In if you nest as deep and as wide as you want with parens, and you have the operators >, <, ==, and != as well as the operators && and ||, as well as compareTo() and equals() methods for objects, as well as boolean objects. Experiment abit.

41. String & Integer Comparison problem!    forums.oracle.com

42. Integer Comparison Question    forums.oracle.com

43. Suspicious comparison of Integer references    forums.oracle.com

earlier message was: This method compares two reference values using the == or != operator, where the correct way to compare instances of this type is generally with the equals() method. It is possible to create distinct instances that are equal but do not compare as == since they are different objects. Examples of classes which should generally not be compared ...