java中的clone

    public static <T> T simpleClone(T obj) throws IllegalAccessException, InstantiationException {
        Class<T> c = (Class<T>) obj.getClass();
        T cloneC = c.newInstance();
        Field[] fields = c.getDeclaredFields();
        if (fields != null && fields.length > 0) {
            for (Field field : fields) {
                field.setAccessible(true);
                Object value = field.get(obj);
                field.set(cloneC, value);
            }
        }
        return cloneC;
    }

public class TestCloneBean implements Cloneable {
   
    private List<Integer> integers;
 
    public List<Integer> getIntegers() {
        return integers;
    }
 
    public void setIntegers(List<Integer> integers) {
        this.integers = integers;
    }
 
    @Override
    public TestCloneBean clone() {
        try {
            TestCloneBean t = (TestCloneBean) super.clone();
            t.setIntegers(Lists.<Integer> newArrayList());
            if (CollectionUtils.isNotEmpty(integers)) {
                for (Integer i : integers) {
                    t.getIntegers().add(i);
                }
            }
            return t;
 
        } catch (CloneNotSupportedException e) {
            throw new RuntimeException(e);
        }
    }
 
    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this);
    }
}

public class JsonUtils {
    private static ObjectMapper objectMapper = new ObjectMapper();
 
    static {
        objectMapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
        objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
        objectMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
        objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);
        objectMapper.configure(JsonParser.Feature.INTERN_FIELD_NAMES, true);
        objectMapper.configure(JsonParser.Feature.CANONICALIZE_FIELD_NAMES, true);
        objectMapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        objectMapper.setSerializationInclusion(Inclusion.NON_NULL);
    }
 
    public static ObjectMapper getObjectMapperInstance() {
        return objectMapper;
    }
 
}
 

TestCloneBean b = new TestCloneBean();
        b.setIntegers(Lists.newArrayList(1));
        String s = JsonUtils.getObjectMapperInstance().writeValueAsString(b);
        TestCloneBean a = JsonUtils.getObjectMapperInstance().readValue(s, TestCloneBean.class);