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  • stream

    public static void main(String[] args) {
            List<GoodsInfor> list = new ArrayList<>();
            List<GoodsInfor> list2 = new ArrayList<>();
            GoodsInfor p = new GoodsInfor();
            p.setGoodsId(1);
            p.setEachGoodsFare(1D);
    
            GoodsInfor p2 = new GoodsInfor();
            p2.setGoodsId(2);
            p2.setEachGoodsFare(2D);
    
            GoodsInfor p3 = new GoodsInfor();
            p3.setGoodsId(3);
            p3.setEachGoodsFare(3D);
    
            list.add(p);
            list.add(p2);
            list.add(p3);
    
            GoodsInfor p4 = new GoodsInfor();
            p4.setGoodsId(1);
            p4.setEachGoodsFare(0D);
    
            GoodsInfor p5 = new GoodsInfor();
    
            p5.setGoodsId(2);
            p5.setEachGoodsFare(0D);
    
            GoodsInfor p6 = new GoodsInfor();
            p6.setGoodsId(3);
            p6.setEachGoodsFare(0D);
            GoodsInfor p7 = new GoodsInfor();
            p7.setGoodsId(4);
            p7.setEachGoodsFare(0D);
    
            list2.add(p4);
            list2.add(p5);
            list2.add(p6);
            list2.add(p7);
    //        list2.stream().flatMap(x -> list.stream()
    //                .map(y -> {x.setEachGoodsFare(y.getEachGoodsFare());
    //                        return x;
    //                })
    //        ).collect(Collectors.toList()).forEach(m->System.out.println(m));
    
            list2.stream().filter((x) -> list.stream().anyMatch((y)->
                   {
                        if (x.getGoodsId() == y.getGoodsId()) {
                            x.setEachGoodsFare(y.getEachGoodsFare());
                            return true;
                        }
                       return false;
                    })
            ).collect(Collectors.toList()).forEach(System.out::println);
    
        }
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  • 原文地址:https://www.cnblogs.com/justuntil/p/13254998.html
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