
MOEA Framework 2.1 API Specification 

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java.lang.Object org.moeaframework.core.comparator.LexicographicalComparator
public class LexicographicalComparator
Compares solutions lexicographically.
Constructor Summary  

LexicographicalComparator()
Constructs a comparator for comparing solutions lexicographically. 
Method Summary  

int 
compare(Solution a,
Solution b)
Compares its two arguments for order. 
Methods inherited from class java.lang.Object 

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait 
Methods inherited from interface java.util.Comparator 

equals 
Constructor Detail 

public LexicographicalComparator()
Method Detail 

public int compare(Solution a, Solution b)
java.util.Comparator
In the foregoing description, the notation sgn(expression) designates the mathematical signum function, which is defined to return one of 1, 0, or 1 according to whether the value of expression is negative, zero or positive.
The implementor must ensure that sgn(compare(x, y)) == sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.)
The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.
Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.
It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals."
compare
in interface Comparator<Solution>
a
 the first object to be compared.b
 the second object to be compared.

MOEA Framework 2.1 API Specification 

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