[Solved]-Implementing three functions at once into a Different Evolution Optimizer-eclipse

you can define three fitness function as f(x1), f(x2), and f(x3). in the code you provided the author defined various cost functions like schwefel's problem in differentialevolution.java file. you need to calculate three fitness value for each individual of the de according to your objectives. since you have multiple objectives, you should then calculate the pareto-optimal of your 3-objective problem. the following links may give you some hints:

https://github.com/jmetal/jmetal

https://github.com/chen0040/java-moea