/**
     * 將一個list均分成n個list
     * @param source
     * @return
     */
    public  <T> List<List<T>> averageAssign(List<T> source,int n){
        List<List<T>> result=new ArrayList<List<T>>();
        int remaider=source.size()%n;  //(先計算出餘數)
        int number=source.size()/n;  //然後是商
 

        int offset=0;//偏移量
        for(int i=0;i<n;i++){
            List<T> value=null;
            if(remaider>0){
                value=source.subList(i*number+offset, (i+1)*number+offset+1);
                remaider--;
                offset++;
            }else{
                value=source.subList(i*number+offset, (i+1
 
)*number+offset);
            }
            result.add(value);
        }
        return result;
    }

class MyCallable implements Callable<Object> {
    private List<Map<String,Object>> els;
    private List<Map<String,Object>> elsend=new ArrayList<>();
    private
 
 String content;

    MyCallable(List<Map<String,Object>> els,String content) {
        this.els = els;
        this.content = content;
    }

    public Object call() throws Exception {
        for (int i = 0; i < els.size(); i++) {
            Map<String, Object> stringObjectMap =  els.get(i);
            String el = (String) stringObjectMap.get("el");
            if(content.indexOf(el)!=-1){
                elsend.add(stringObjectMap);
            }
        }
        return elsend;
    }
}

呼叫程式碼片段

List<List<Map<String,Object>>> elsArr = averageAssign(els,10);

            // 建立一個執行緒池
            ExecutorService pool = Executors.newFixedThreadPool(elsArr.size());
            // 建立多個有返回值的任務
            List<Future<List<Map<String,Object>>>> list = new ArrayList<Future<List<Map<String,Object>>>>();
            for (int i = 0; i < elsArr.size(); i++) {
                Callable c = new MyCallable(elsArr.get(i),content);
                // 執行任務並獲取Future物件
                Future f = pool.submit(c);
                list.add(f);
            }
            // 關閉執行緒池
            pool.shutdown();

            // 獲取所有併發任務的執行結果
            for (Future<List<Map<String,Object>>> f : list) {
                List<Map<String,Object>> l = f.get();
                for (int i = 0; i < l.size(); i++) {
                    Map<String, Object> stringObjectMap =  l.get(i);
                    elsend.add(stringObjectMap);
                }
            }
            pbdDocument.setEls(elsend);