禁忌搜索算法java

### 禁忌搜索算法简介

禁忌搜索(Tabu Search)属于元启发式算法的一种，旨在克服传统局部搜索方法容易陷入局部最优解的问题。此算法引入了记忆机制——即所谓的“禁忌表”，用于记录已经访问过的状态或操作，在一定迭代次数内阻止返回这些状态，从而促使搜索过程探索新的解决方案空间[^1]。

### Java 实现范例

下面提供了一个简化版的禁忌搜索框架实现：

import java.util.*;

public class TabuSearch {
    private static final int MAX_ITERATIONS = 100;
    private static final int TABU_TENURE = 10;

    public static void main(String[] args) {
        Solution currentSolution = new Solution();
        List<Solution> tabuList = new ArrayList<>();
        
        for (int i = 0; i < MAX_ITERATIONS; ++i){
            Collection<Solution> neighbors = generateNeighbors(currentSolution);
            
            Optional<Solution> bestNeighborOpt = findBestNonTabuNeighbor(neighbors, tabuList);

            if (!bestNeighborOpt.isPresent()) continue;

            Solution bestNeighbor = bestNeighborOpt.get();

            // 更新当前解为最佳邻居解
            currentSolution = bestNeighbor;

            // 将新选中的移动加入到禁忌列表中并维护其大小不超过设定值
            updateTabuList(tabuList, bestNeighbor.moveFromCurrent(), TABU_TENURE);
            
            System.out.println("Iteration " + i + ": Best solution found so far is " + currentSolution.getValue());
        }
    }

    private static void updateTabuList(List<Solution> list, Move move, int tenure) {
        list.add(new Solution(move));
        if(list.size() > tenure)
            list.remove(0);    
    }

    private static Optional<Solution> findBestNonTabuNeighbor(Collection<Solution> solutions, List<Solution> tabuList) {
        return solutions.stream()
                        .filter(solution -> !tabuList.contains(solution))
                        .max(Comparator.comparingDouble(Solution::getValue));
    }

    private static Collection<Solution> generateNeighbors(Solution s) {
        // 这里应该定义如何生成邻域内的候选方案集
        throw new UnsupportedOperationException("Not implemented");
    }
}

class Solution implements Comparable<Solution>{
    double value;
    Move lastMove;

    @Override
    public boolean equals(Object o){ /* ... */ }
    @Override
    public int hashCode(){ /* ... */ }
    @Override
    public int compareTo(Solution other){ /* ... */ }
    
    public double getValue(){
        return this.value;
    }
    
    public Move moveFromCurrent(){
        return this.lastMove;
    }
}
interface Move {/* 定义具体问题下的动作 */}

上述代码展示了禁忌搜索的核心逻辑结构，但请注意`generateNeighbors()`函数以及`Solution`, `Move`类的具体实现依赖于实际应用场景和目标函数的设计需求。因此这部分留给开发者根据实际情况完成。