hashmap

        
        
        
        Map<Long, HashMap<Long,Boolean>> midmap = new HashMap<Long, HashMap<Long,Boolean>>(size);
        
        for(long i=0; i<size-100000; i++){
            if(i%10000==0){
                System.out.println(i);
            }
            HashMap<Long,Boolean> sizemap = new HashMap<Long,Boolean>(5);
            sizemap.put(1L, true);
            sizemap.put(2L,true);
            sizemap.put(3L, true);
            sizemap.put(4L, true);
            sizemap.put(5L, true);
            
            midmap.put(i, sizemap);
        }
        
        System.out.println("begin to sleep.");
        try {
            Thread.sleep(10000000000L);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        midmap.get(1);
        System.out.println("done!");