- This is a modal window. No compatible source was found for this media. argsArrayList<Student>arrayList=newArrayList<>();// use add() method to add elements in the arrayListarrayList.add(newStudent(1,"Julie"));
ArrayList<String>arraylist=newArrayList<>();arraylist.add("one");// ["one"]arraylist.add("two");// ["one", "two"]arraylist.add(0,"zero");// ["zero", "one", "two"] 1. ArrayList.add() Method Theadd()method first ensures that there is sufficient space in the arraylist. If the...
Java ArrayList addAll() Method - Learn how to use the addAll() method in Java's ArrayList to efficiently add multiple elements at a specified index. Detailed examples and explanations included.
ArrayList<String> letters =newArrayList<>(); letters.add("A"); letters.add("B"); letters.add("C"); System.out.println(letters);// [A, B, C]ArrayList<String>namesStartWithA =newArrayList<>(); namesStartWithA.add("Adel"); namesStartWithA.add("Ahmed"); namesStartWithA.add("Ali")...
* ArrayList扩容的核心方法。 */privatevoidgrow(intminCapacity){// oldCapacity为旧容量,newCapacity为新容量intoldCapacity=elementData.length;//将oldCapacity 右移一位,其效果相当于oldCapacity /2,//我们知道位运算的速度远远快于整除运算,整句运算式的结果就是将新容量更新为旧容量的1.5倍,intnewCapacity=old...
* 增加 ArrayList 实例的容量,确保 ArrayList 实例能存储 minCapacity 个元素 */privatevoidgrow(intminCapacity){// overflow-conscious codeintoldCapacity=elementData.length;//扩容为当前容量的 1.5 倍intnewCapacity=oldCapacity + (oldCapacity >>1);if(newCapacity - minCapacity <0) ...
booleanaddAll(int index,Collection<? extendsE> c) Inserts all of the elements in the specified collection into this list, starting at the specified position. voidclear() Removes all of the elements from this list. Objectclone() Returns a shallow copy of thisArrayListinstance. ...
Java ArrayList.addAll() appends all of the elements of argument collection to the list at the end or the specified index position.
如果你需要反射读取注解，却把保留策略设置为RetentionPolicy.SOURCE、RetentionPolicy.CLASS，那就读取不到了...
arrayList.add("橙子"); arrayList.add("苹果"); // 可以重复 System.out.println("ArrayList: " + arrayList); System.out.println("第一个元素:" + arrayList.get(0)); System.out.println("大小:" + arrayList.size()); // 遍历 for (String fruit : arrayList) { System.out.println("水果:" ...