list는 대상 안의 일부 필드에 따라 다시 시작합니다

1、   
 SalesInvoiceInfo salesInvoiceInfo5 = new SalesInvoiceInfo();
    salesInvoiceInfo5.setInvoiceCode("010");
    salesInvoiceInfo5.setInvoiceNo("009");
    salesInvoiceInfo5.setName("name3");


    SalesInvoiceInfo salesInvoiceInfo = new SalesInvoiceInfo();
    salesInvoiceInfo.setInvoiceCode("010");
    salesInvoiceInfo.setInvoiceNo("009");
    salesInvoiceInfo.setName("name2");


    SalesInvoiceInfo salesInvoiceInfo6 = new SalesInvoiceInfo();
    salesInvoiceInfo6.setInvoiceCode("010");
    salesInvoiceInfo6.setInvoiceNo("009");
    salesInvoiceInfo6.setName("name2");


    SalesInvoiceInfo salesInvoiceInfo4 = new SalesInvoiceInfo();
    salesInvoiceInfo4.setInvoiceCode("008");
    salesInvoiceInfo4.setInvoiceNo("008");
    salesInvoiceInfo4.setName("name2");


    List salesInvoiceInfoList = new ArrayList<>();
    salesInvoiceInfoList.add(salesInvoiceInfo);
    salesInvoiceInfoList.add(salesInvoiceInfo4);
    salesInvoiceInfoList.add(salesInvoiceInfo5);
    salesInvoiceInfoList.add(salesInvoiceInfo6);

    List salesInvoiceInfoList1 = removeDuplicateInvoice(salesInvoiceInfoList);
    System.out.println(salesInvoiceInfoList1.size());
}

// 
private static List removeDuplicateInvoice(List salesInvoiceInfoList) {
    List list = new ArrayList<>();
    if (CollectionUtils.isNotEmpty(salesInvoiceInfoList)) {
        for (SalesInvoiceInfo salesInvoiceInfo : salesInvoiceInfoList) {
            //list ， equals
            if (!list.contains(salesInvoiceInfo)) {
                list.add(salesInvoiceInfo);
            }
        }
    }
    return list;
}

 
2、

public class SalesInvoiceInfo implements Serializable{
    private static final long serialVersionUID = -6074031923789366561L;
    private String invoiceNo;// 
    private String invoiceCode;// 

    private String name ;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getInvoiceNo() {
        return invoiceNo;
    }

    public void setInvoiceNo(String invoiceNo) {
        this.invoiceNo = invoiceNo;
    }

    public String getInvoiceCode() {
        return invoiceCode;
    }

    public void setInvoiceCode(String invoiceCode) {
        this.invoiceCode = invoiceCode;
    }

//    @Override
//    public int hashCode() {
//        return super.hashCode();
//    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (this == obj) {
            return true;
        }
        SalesInvoiceInfo user = (SalesInvoiceInfo) obj;
        if (this.getInvoiceNo() .compareTo(user.getInvoiceNo())==0
                && this.getInvoiceCode().equals(user.getInvoiceCode())){
            return true;
        }
        return false;
    }
}