In Java, how to copy an object value to a new object and change the data without affecting another reference variable

Question content

I need to print the request body with masked data in the console. So I want to separate the request object that is masked for printing to the console from the request object that is used for business without masking.

So I cloned the request object (underwriterequest request) to a new object (underwriterequest requestmasking) and then used the method to mask the data.

But when I set the shielding ID to new object, the reference object (underwriterrequest request) also has shielding.

I don't want to block (underwriterequest request) because the object must be used in business logic.

Why does it affect the reference object? How can I mask data without affecting the reference object?

Thanks.

public @ResponseBody ResponseEntity<UnderwriteResponse> execute(@RequestBody UnderwriteRequest request) {

        UnderwriteRequest requestMasking = maskingData(request);
}






public static UnderwriteRequest maskingData(UnderwriteRequest request) throws CloneNotSupportedException {
    UnderwriteRequest requestMasking = (UnderwriteRequest) request.clone();

    try {
            
            if(request != null) {

                if(request.getRequestBody().getPersonalData().getIdCard() != null && !request.getRequestBody().getPersonalData().getIdCard().isEmpty()) {
            
                        maskIdCard(requestMasking, request);
                
        }
        }catch (Exception e) {
             log.info(e);
    }

    return requestMasking;
}





public static void maskIdCard(UnderwriteRequest requestMasking, UnderwriteRequest request) {
            String maskChar = "X";
            String maskString = StringUtils.repeat( maskChar, 9);
            String idcard = request.getRequestBody().getPersonalData().getIdCard();
                    requestMasking.getRequestBody().getPersonalData().setIdCard(StringUtils.overlay(idcard, maskString, 0, 9));

}



@Getter
@Setter
public class UnderwriteRequest implements Cloneable{


    private RequestHeader requestHeader;
    private RequestBrmsBody requestBrmsBody;
    private RequestBody requestBody;

    private RESPONSE_STATUS status = RESPONSE_STATUS.FAILED;
    private String message;
    
    @Override
    public Object clone() throws CloneNotSupportedException {
        // TODO Auto-generated method stub
        return super.clone();
    }
    
    

    
}

I use the clone() method to copy the object value to a new object. Because I think when I change the data in the new object, it won't affect the reference object. https://www.geeksforgeeks.org/clone-method-in-java-2/

Correct Answer

It seems that you are using SpringBoot framework. You can take a look at the BeanUtils.copyProperties(); method. This method assigns the same properties to the first and second objects via reflection. There won’t be the problem you mentioned

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