* @CreateDate ; 2014年7月9日 下午6:43:26*/publicclassLesson9_arrayCopyTest {publicstaticvoidmain(String[] args) {//Lesson9_arrayCopyTest.arraysCopyOf();//Lesson9_arrayCopyTest.systemArraycopy();Lesson9_arrayCopyTest.deepArrayCopy(); }publicstaticvoidarraysCopyOf(){int[] a = {1,2,3...
Note that thesuper.clone()call returns a shallow copy of an object, but we set deep copies of mutable fields manually, so the result is correct: @TestpublicvoidwhenModifyingOriginalObject_thenCloneCopyShouldNotChange(){Addressaddress=newAddress("Downing St 10","London","England");Userpm=newUs...
public List deepCopy(List src) throws IOException, ClassNotFoundException{ ByteArrayOutputStream byteOut = new ByteArrayOutputStream(); ObjectOutputStream out = new ObjectOutputStream(byteOut); out.writeObject(src); ByteArrayInputStream byteIn = new ByteArrayInputStream(byteOut.toByteArray()); Ob...
returnbeanCopiers.get(clz); beanCopiers.putIfAbsent(clz, BeanCopier.create(clz, clz,true)); returnbeanCopiers.get(clz); } } 上面就是整个深拷贝的魔法核心。 1)使用了BeanCopier,并缓存这个对象,性能提升50%,从1s下降到600ms。 2)判断array,如果是byte[]类型,直接使用浅拷贝。这个是个特殊对象。 测...
of(array); 这个方法是Java9的新方法,定义在List接口中,是静态方法,可以直接调用类名。 list和数组都是java种比较重要的知识点,大家肯定也对它们相互之间的类型有所转换,那么在数组转换成list的方法上,本篇有4种方法可以进行这方面问题的解决。 以上就是java数组转list的方法,在转换的方式上,可以选择的种类还是...
OfCode(source.getSex()))"), @Mapping(target = "createTime", source = "createTime", date...
privatestaticbyte[]fromHex(final String text){final int shift=4;final ByteArrayOutputStream out=newByteArrayOutputStream(text.length());for(int i=0;i<text.length();){final char c=text.charAt(i++);if(c=='%'){if(i>text.length()-2){break;// unterminated sequence}final byte b1=HEX_...
To prevent changes reflected in both lists, we should explicitly create a deep copy of the list. 1. UsingArrayList.clone()for Shallow Copy Theclone()method creates a newArrayListand thencopies the backing array to cloned array. It creates a shallow copy of the given arraylist. In a shallow...
In the case of Perl, the contest is pointless. Closure in Java If you want to have a closure in Java, you can create one yourself. The good old way is to use anonymous, or for that matter, regular classes. The other is to mimic the behavior of the Groovy compiler and create a ...
{ this.name = name; this.gpa = gpa; } public Student deepCopyUsingSerialization() { try { ByteArrayOutputStream bo = new ByteArrayOutputStream(); ObjectOutputStream o = new ObjectOutputStream(bo); o.writeObject(this); ByteArrayInputStream bi = new ByteArrayInputStream(bo.toByteArray())...