JAVA 取自增序號（可用於實體類排序）

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


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

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

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

 //輸出展示

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());