[java]测试static的map的内存

import com.carrotsearch.sizeof.RamUsageEstimator;  
import lombok.extern.slf4j.Slf4j;  
  
import java.util.Date;  
import java.util.HashMap;  
import java.util.Map;  
  
@Slf4j  
public class MemoryTest {  
  
    static Map<String, String> map;// map是否为static，对里面的String和Date的内存释放没有什么影响  
  public static void main(String\[\] args) throws InterruptedException {  
        Map<String, String> map;  
  
 while (true) {  
            map = new HashMap<>();  
 for (int i = 0; i < 100000; i++) {  
                map.put(UuidUtil.get32UUID(), new Date().toString());  
  }  
            // 1w次为2368 K，内存跳到100M就稳定  
 // 10w次为23680 K，内存要跳到250M、500M、750M才稳定  
 log.info("Data Size：{} K", RamUsageEstimator.sizeOf(map)/1024);  
//            log.info("Data Size：{} M", RamUsageEstimator.sizeOf(map)/1024/1024);  
  Thread.sleep(50000);  
  }  
    }  
}