Finding the Largest and Smallest Elements in Java

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Finding the Largest and Smallest Elements
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The max() and min() functions in the Sequences class return, respectively, the largest and smallest element in a sequenceThere are two variants of each of these functions Let s look first at the simpler variants:
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public function max(seq: Comparable[]): Comparable; public function min(seq: Comparable[]): Comparable
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7 Sequences
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These functions can be used when the sequence consists of elements that implement the Comparable interface Many types implement this interface, including String and the numeric typesThe value returned is the element in the sequence that has the greatest or least value For example
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var ints = [99, 88, 1, 23, 44]; var maxInt:Integer = Sequencesmax(ints) as Integer; var minInt:Integer = Sequencesmin(ints) as Integer; println("ints: max is {maxInt}, min is {minInt}");
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This code prints the following:
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ints: max is 99, min is 1
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Compare the preceding output with this code, which involves a sequence of strings:
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var strs = ["Abcd", "A", "AA", "ZZ", "Z"]; var maxStr:String = Sequencesmax(strs) as String; var minStr:String = Sequencesmin(strs) as String; println("strings: max is {maxStr}, min is {minStr}");
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The output from this code is this:
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strings: max is ZZ, min is A
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It is important to note that the max() and min() functions return a value of type you want to assign the result to a variable of a more specific type, you need to use a cast, as previously shown:
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Comparable If var maxStr:String = Sequencesmax(strs) as String;
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If the elements in a sequence do not implement Comparable, or if you want to compare the elements in a different way, you can use the variants of these functions that accept a Comparator:
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public function max(seq: Object[], c: Comparator): Object public function min(seq: Object[], c: Comparator): Object
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For example, the following code finds the strings from the preceding sequence that have the maximum and minimum number of characters Strings that have the same number of characters are compared using their compareTo() function, which provides the normal alphabetic ordering among strings of equal length3
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var comp:Comparator = Comparator { override function compare(o1: Object, o2:Object): Integer { var s1 = o1 as String; var s2 = o2 as String;
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The syntax used in the implementation of the Comparator in this example should look somewhat familiar to you It is the JavaFX equivalent of an anonymous inner class that implements the Comparator interface You ll see more of this in 10
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Operations on Sequences
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var l1 = s1length(); var l2 = s2length(); if (l1 == l2) { return s1compareTo(s2); } else if (l1 < l2) { return -1; } else { return 1; } } override function equals(o:Object): Boolean { return o == comp; } }; println("strings with comparator: max is {Sequencesmax(strs, comp)} ); println("strings with comparator: min is {Sequencesmin(strs, comp)} );
The result of running this code is the following:
strings with comparator: max is Abcd strings with comparator: min is A
As noted in 6, Expressions, Functions, and Object Literals, the override keyword in the preceding code indicates that the associated function definitions are overrides of those in a base class or, in this case, implementations of interface methods For more details, see 11, JavaFX Script Classes
Sorting a Sequence
The Sequences class has two functions that return a sorted copy of a sequenceAs with the max() and min() functions, the difference is the way in which the elements of the sequence are compared:
public function sort(seq: Comparable[]): Comparable[] public function sort(seq: Object[], c: Comparator): Object[]
In both cases, a new sequence is returned, leaving the original unmodifiedThe returned sequence is arranged in ascending order with respect either to the Comparator supplied or to the elements natural sort order if a Comparator is not used If the source sequence contains adjacent elements that are equal, their relative order will not be changed when the sort is performedThis is an important characteristic of a sorting algorithm (referred to as stability), which makes it possible to re-sort a sequence that is already partially sorted without any unnecessary rearrangement of its content The following example sorts a sequence of Integers and prints both the sorted sequence and the original to demonstrate that it is not modified:
var ints = [99, 88, 1, 23, 44];