遗传算法java代码
时间: 2023-12-03 15:03:06 浏览: 49
以下是一个简单的遗传算法Java代码示例:
```java
public class GeneticAlgorithm {
private Population population;
private int populationSize;
private double mutationRate;
private double crossoverRate;
private int elitismCount;
public GeneticAlgorithm(int populationSize, double mutationRate, double crossoverRate, int elitismCount) {
this.populationSize = populationSize;
this.mutationRate = mutationRate;
this.crossoverRate = crossoverRate;
this.elitismCount = elitismCount;
this.population = new Population(this.populationSize, true);
}
public void evolvePopulation() {
Population newPopulation = new Population(this.populationSize, false);
// Apply elitism
for (int i = 0; i < this.elitismCount; i++) {
newPopulation.saveIndividual(i, this.population.getFittest(i));
}
// Crossover population
for (int i = this.elitismCount; i < this.populationSize; i++) {
Individual parent1 = this.selectParent();
Individual parent2 = this.selectParent();
Individual child = parent1.crossover(parent2, this.crossoverRate);
newPopulation.saveIndividual(i, child);
}
// Mutate population
for (int i = this.elitismCount; i < this.populationSize; i++) {
newPopulation.getIndividual(i).mutate(this.mutationRate);
}
this.population = newPopulation;
}
private Individual selectParent() {
Population tournament = new Population(5, false);
for (int i = 0; i < 5; i++) {
int randomIndex = (int) (Math.random() * this.populationSize);
tournament.saveIndividual(i, this.population.getIndividual(randomIndex));
}
return tournament.getFittest(0);
}
public Individual getFittest() {
return this.population.getFittest(0);
}
}
```
该代码包含以下功能:
1. 初始化种群
2. 进行种群进化
3. 选择父代
4. 交叉运算
5. 变异
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