关于Lists.partition集合分组使用以及注意事项

<dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>21.0</version>
    </dependency>

 public static void main(String[] args) {
 		//需要进行分组的集合
        List<Integer> targetList = new ArrayList<>();
        targetList.add(1);
        targetList.add(2);
        targetList.add(3);
        targetList.add(4);
        targetList.add(5);
        targetList.add(6);
        //集合分组。2代表 每两个分成一组。已知集合size=6，两个一组即分为三组
        List<List<Integer>> partition = Lists.partition(targetList, 2);
        System.out.println("切分后的数组,index【0】:"+partition.get(0));
        System.out.println("切分后的数组,index【1】:"+partition.get(1));
        System.out.println("切分后的数组,index【2】:"+partition.get(2));

    }

public static void main(String[] args) {
        List<Integer> targetList = new ArrayList<>();
        targetList.add(1);
        targetList.add(2);
        targetList.add(3);
        targetList.add(4);
        targetList.add(5);
        targetList.add(6);
        List<List<Integer>> partition = Lists.partition(targetList, 2);
        System.out.println("切分后的数组,index【0】:"+partition.get(0));
        System.out.println("切分后的数组,index【1】:"+partition.get(1));
        System.out.println("切分后的数组,index【2】:"+partition.get(2));
        targetList.clear();
        System.out.println("原集合大小"+targetList.size());
        System.out.println("分组后集合大小"+partition.size());


    }