java.util库提供了一套相当完整的集合类(collection classes)来解决这个问题,其中基本的类型有List、Set、Queue和Map。也称作容器类(container classes)。集合提供了完善的方法来保存对象,可以使用这些工具来解决大量的问题。 集合还有一些其它特性。例如, Set对于每个值都只保存一个对象 Map是一个关联数
AI代码解释 privatevoidgrow(intminCapacity){// overflow-conscious codeintoldCapacity=elementData.length;intnewCapacity=oldCapacity+(oldCapacity>>1);if(newCapacity-minCapacity<0)newCapacity=minCapacity;if(newCapacity-MAX_ARRAY_SIZE>0)newCapacity=hugeCapacity(minCapacity);// 将原数组元素拷贝到新数组eleme...
staticObjectget(Objectarray, int index) Returns the value of the indexed component in the specified array object. static booleangetBoolean(Objectarray, int index) Returns the value of the indexed component in the specified array object, as aboolean. ...
基本类型boolean,byte,char,short,int,long,float,double和关键字void同样表现为 class 对象。 public final class Class<T> implements java.io.Serializable,GenericDeclaration,Type,AnnotatedElement {private static final int ANNOTATION= 0x00002000;private static final int ENUM = 0x00004000;private static final...
Using Multiple Classes You can also create an object of a class and access it in another class. This is often used for better organization of classes (one class has all the attributes and methods, while the other class holds themain()method (code to be executed)). ...
\itstack\git\istack-demo\itstack-demo-jvm\itstack-demo-jvm-03\target\classes;D:\Program Files (x86)\apache- maven-2.2.1\repository\com\beust\jcommander\1.72\jcommander-1.72.jar;D:\Program Files (x86)\apache-maven- 2.2.1\repository\org\projectlombok\lombok\1.18.0\lombok-1.18.0.jar;D:\...
Object[]toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element). <T> T[]toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of...
7)容器所持有的其实是一个个reference指向Object,进而才能存储任意型别。当然这不包括基本型别,因为基本型别并不继承自任何classes。 8)面对Array,我们可以直接持有基本型别数值的Array(例如:int [] num;),也可以持有reference(指向对象)的Array;但是容器类仅能持有reference(指向对象),若要将基本型别置于容器内,需...
}publicObject[] toArray() {returna.clone(); }public< T > T[] toArray(T[] a) {intsize=size();if(a.length <size){returnArrays.copyOf(this.a,size,(Class< ?extendsT[] >) a.getClass()); } System.arraycopy(this.a,0, a,0,size);if(a.length >size){ ...