JAVA 取自增序号（可用于实体类排序）

//import java.util.concurrent.atomic.AtomicInteger; //引入


//将List按照某一字段升序排序
List<SrmSfdBidItemLadderVO> itemRank=itemRank.stream().sorted(Comparator.comparing(SrmSfdBidItemLadderVO::getLadderNoTaxPrice)).collect(Collectors.toList());

//设置自增值
AtomicInteger index = new AtomicInteger(0);

//设置序号
itemRank.stream().forEach(ro->{  
ro.setLadderBidRank(index.incrementAndGet());
                            });

 //输出展示

AtomicInteger index = new AtomicInteger(0);
System.out.println(index.incrementAndGet());
System.out.println(index.incrementAndGet());
System.out.println(index.incrementAndGet());
System.out.println(index.incrementAndGet());