2Creates and returns a copy of this object. The precise meaning of "copy" may depend on the class of the object. 3The general intent is that, for any object x, the expression: 41) x.clone() != x will be true 52) x.clone().getClass() == x.getClass() will be true, but th...
因为原数组 scores 的数据类型为 int,而使用 Arrays.copyOf(scores,8) 方法复制数组之后返回的是 Object[] 类型,因此需要将 Object[] 数据类型强制转换为 int[] 类型。同时,也正因为 scores 的数据类型为 int,因此默认值为 0。 运行的结果如下所示。 原数组内容如下: 57 81 68 75 91 复制的新数组内容如...
10. ObjectOutputStream oos = new ObjectOutputStream(baos); 11. oos.writeObject(obj); 12. oos.close(); 13. // 分配内存空间,写入原始对象,生成新对象 14. ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray()); 15. ObjectInputStream ois = new ObjectInputStream(bais); 16....
When we want to copy an object in Java, there are two possibilities that we need to consider,a shallow copy and a deep copy. For the shallow copy approach, we only copy field values, therefore the copy might be dependant on the original object. In the deep copy approach, we make sure...
1/*2Creates and returns a copy of this object. The precise meaning of "copy" may depend on the class of the object. 3The general intent is that, for any object x, the expression: 41) x.clone() != x will be true 52) x.clone().getClass() == x.getClass() will be true, bu...
其实有很多种方法进行属性拷贝的,例如dozer等等 下面看下测试性能吧:以:万级进行测试,我觉得Cglib太给力了.可以在遇到属性拷贝瓶颈时考虑.当然他们各有优点哈,功能也不尽相同.还需要多使用体会. 输出结果:手动Copy >Mapstuct>= cglibCopy > springBeanUtils > apachePropertyUtils > apacheBeanUtils 可以理解为: 手工...
The arrival of Java Card Development Kit 24.1 The Java Card team is excited to announce the general availability of the Java Card Development Kit v24.1. This significant update improves the Oracle comprehensive stand-alone development environment, which includes tools, a simulator and a plugin, enab...
.println(string);}System.out.println("---");var map=newHashMap<>();map.put("k1","v1");map.put("k2","v2");var map2=Map.copyOf(map);System.out.println(map2.getClass());var keys=map2.keySet();for(Object object:keys){System.out.println(map2.get(object));}}} 小结 List,...
out.println(string);}System.out.println("---");varmap=newHashMap<>();map.put("k1","v1");map.put("k2","v2");varmap2=Map.copyOf(map);System.out.println(map2.getClass());varkeys=map2.keySet();for(Objectobject:keys){System.out.println(map2.get(object));}}} 小结 List,...
lang.Object) 实现对象复制: public class BeanConvertUtil { private static DozerBeanMapper dozerBeanMapper = new DozerBeanMapper(); public static <T> T copyBeanProperties(Object src, T desc) { if (src == null) { return null; } else { dozerBeanMapper.map(src, desc); return desc; } }...