Comparing Sequences in Java

Printer QR Code JIS X 0510 in Java Comparing Sequences
Comparing Sequences
QR Generation In Java
Using Barcode encoder for Java Control to generate, create QR Code 2d barcode image in Java applications.
Consider the following code:
Make Barcode In Java
Using Barcode generator for Java Control to generate, create bar code image in Java applications.
var var var var date1A:GregorianCalendar date1B:GregorianCalendar date2A:GregorianCalendar date2B:GregorianCalendar = = = = new new new new GregorianCalendar(2009, GregorianCalendar(2009, GregorianCalendar(2009, GregorianCalendar(2009, 10, 10, 10, 10, 20); 20); 21); 21);
Barcode Scanner In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
var datesA = [date1A, date2A]; var datesB = [date1B, date2B]; println("datesA == datesB {datesA == datesB}");
Quick Response Code Drawer In Visual C#
Using Barcode creator for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
Two sequences of GregorianCalendar objects are created and compared for equality As noted earlier, two sequences are equal if they are of the same length and each element of the first sequence is equal to the corresponding element in the other sequence, where equality is determined by using the equals() method of the object concerned In this
QR Code Creation In .NET
Using Barcode creator for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications.
7 Sequences
QR Generation In VS .NET
Using Barcode creation for .NET Control to generate, create QR-Code image in .NET applications.
case, the sequences are equal because they have the same number of elements, date1A is equal to date1B, and date2A is equal to date2B Not surprisingly, therefore, this code prints the following:
QR Code 2d Barcode Drawer In VB.NET
Using Barcode generation for VS .NET Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
datesA == datesB true
EAN / UCC - 13 Printer In Java
Using Barcode creator for Java Control to generate, create EAN-13 Supplement 5 image in Java applications.
Although this is normally the behavior you would want, it is sometimes useful to know whether two sequences contain exactly the same object instances not just paired objects that are equalYou can do this using the isEqualByContentIdentity() function:
Bar Code Generator In Java
Using Barcode maker for Java Control to generate, create bar code image in Java applications.
public function isEqualByContentIdentity(seq1: Object[], seq2: Object[]): Boolean
GTIN - 12 Generation In Java
Using Barcode creator for Java Control to generate, create UPC-A Supplement 5 image in Java applications.
This function compares the sequence elements using reference equality, so the two sequences will be considered to be different if any element in one sequence is not the same object instance as its counterpart in the other Here s some code that illustrates this:
Code 39 Full ASCII Generation In Java
Using Barcode generator for Java Control to generate, create ANSI/AIM Code 39 image in Java applications.
println("datesA/datesB same " "{SequencesisEqualByContentIdentity(datesA, datesB)}");
Making Code-128 In Java
Using Barcode maker for Java Control to generate, create Code 128 Code Set C image in Java applications.
We know that datesA and datesB are equal, but the elements in these sequences are different instances of objects that happen to be equal to each other Hence, this code prints the following:
Make Monarch In Java
Using Barcode generation for Java Control to generate, create Monarch image in Java applications.
datesA/datesB same false
Printing ANSI/AIM Code 39 In VB.NET
Using Barcode printer for Visual Studio .NET Control to generate, create USS Code 39 image in .NET framework applications.
However, if we create another sequence containing the same elements as those in and compare that with datesA using isEqualByContentIdentity(), we get a different result:
Bar Code Generator In VB.NET
Using Barcode creation for .NET Control to generate, create barcode image in VS .NET applications.
datesA var datesC = [date1A, date2A]; println("datesA/datesC same " "{SequencesisEqualByContentIdentity(datesA, datesC)}");
Generate Barcode In Visual C#
Using Barcode generator for .NET Control to generate, create bar code image in .NET framework applications.
This prints the following:
Printing Data Matrix In Visual C#.NET
Using Barcode creator for .NET Control to generate, create Data Matrix ECC200 image in VS .NET applications.
datesA/datesC same true
EAN128 Generator In .NET Framework
Using Barcode creator for VS .NET Control to generate, create EAN / UCC - 13 image in VS .NET applications.
Incidentally, this trivial case also returns true, as you might expect:
Bar Code Generator In .NET Framework
Using Barcode maker for VS .NET Control to generate, create barcode image in VS .NET applications.
SequencesisEqualByContentIdentity(datesA, datesA)
Draw Barcode In Visual C#
Using Barcode printer for .NET framework Control to generate, create barcode image in VS .NET applications.
Searching for Elements
There is no easy way to find the index of a given element of a sequence One way to do so is to loop over each element of the sequence using the for statement described in 8 until you find the one you are looking for Fortunately, the Sequences class provides four functions that do this work for you:
public function indexOf(seq: Object[], key: Object): Integer public function nextIndexOf(seq: Object[], key: Object, pos: Integer): Integer
Operations on Sequences
public function indexByIdentity(seq: Object[], key: Object): Integer public function nextIndexByIdentity(seq: Object[], key: Object, pos: Integer): Integer
There are two groups of functionsThe functions in the first group look for an element that is equal to the one passed as the key argumentThose in the other look for the exact instance that is passed to them Because the equality check is the only difference between these groups, we ll look only at the functions in the first group The following code illustrates both the indexOf() and nextIndexOf() functions:
1 2 3 4 5 6 7 8 9 10 11 12 13 var strings = ["A", "B", "C", "A", "B"]; // Look for the first "A" var index = SequencesindexOf(strings, "A"); println('Index of "A": {index}'); // Look for the second "A" index = SequencesnextIndexOf(strings, "A", index + 1); println('Second index of "A": {index}'); // Look for another "A", which will not succeed index = SequencesnextIndexOf(strings, "A", index + 1); println('Third index of "A": {index}');
The sequence strings contains two elements with value "A"The indexOf() call on line 4 returns the index of the first "A", which is at index 0:
Index of "A": 0
The nextIndexOf() function requires a sequence, a value to look for, and an index It searches the sequence starting at the given index, rather than at the fixed index of 0 used by indexOf()To search for the second "A", we ask it to start at an index one greater than the location at which the first "A" was found, as shown on line 8This results in the following:
Second index of "A": 3
Because there isn t another "A", when we call nextIndexOf() for the second time on line 12, we get back the value -1, which is how both indexOf() and nextIndexOf() indicate that no match was found:
Third index of "A": -1