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常用Java时间处理、guava-Lists分割

 2017-11-7 /  0评 / Java

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import com.alibaba.fastjson.JSON;
import com.google.common.collect.Lists;
import com.google.common.primitives.Ints;
import java.util.List;

public static void main(String[] args) {
      long diff = new Date().getTime();
      long system = System.currentTimeMillis();
      long nanoTime = System.nanoTime();
      System.out.println("system  :" + system);
      System.out.println("diff    :" + diff);
      System.out.println("nanoTime:" + nanoTime);

      // google guava-16.0.1.jar
      List countUp = Ints.asList(1, 2, 3, 4, 5,6);
      // [5, 4, 3, 2, 1]
      List countDown = Lists.reverse(countUp);
      System.out.println("countDown:"+JSON.toJSONString(countDown));
      //[[1,2],[3,4],[5,6]]
      List<List<Integer>> parts = Lists.partition(countUp, 2);
      for(List<Integer> subList:parts){
          System.out.println(parts.size()+",subList"+JSON.toJSONString(subList));
      }
      System.out.println("parts    :"+JSON.toJSONString(parts));
}

最后console输出：
system  :1510045212131
diff    :1510045212131
nanoTime:26242702289112
countDown:[6,5,4,3,2,1]
3,subList[1,2]
3,subList[3,4]
3,subList[5,6]
parts    :[[1,2],[3,4],[5,6]]

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