下面是一个简单的Java代码示例,演示了如何使用ArrayList类存储一组数据: importjava.util.ArrayList;publicclassMain{publicstaticvoidmain(String[]args){ArrayList<String>list=newArrayList<>();list.add("Apple");list.add("Banana");list.add("Orange");for(Stringfruit:list){System.out.println(fruit);}}} ...
你只需要简单的引入就可以了import com.*;表示引入该包中的所有类即可.
在第三个类中加上package com;然后再在第一个类和第二个类也分别加入package com;在第三个类中想使用前面两个类时 你只需要简单的引入就可以了import com.*;表示引入该包中的所有类即可.
Java has animportstatement that allows you to import an entire package (as in earlier examples), or use only certain classes and interfaces defined in the package. The general form ofimportstatement is: import package.name.ClassName; // To import a certain class only import package.name.* /...
How to Import Math in Java? As we discussed above, the Math class belongs to java.lang package, so it helps to access the Math class implicitly. Now we will look at how we can import the Java Math class. Syntax The syntax to import any package or class is given as: ...
Class类原理 如何获得一个Class类对象 使用Class类的对象来生成目标类的实例 Object类 类构造器public Object(); registerNatives()方法; Clone()方法实现浅拷贝 getClass()方法 equals()方法 hashCode()方法; toString()方法 wait() notify() notifAll() ...
import com.mojang.rubydung.level.Level;//Level.class在jar文件的com/mojang/rubydung/level/下,java的文件调用方式是用.分割 ... level = new Level(256, 256, 64);//调用了Level.class中的地形生成函数Level,从而生成了一个256x256x64大小的世界 ...
importjava.util.concurrent.ExecutorService;importjava.util.concurrent.Executors;/** * 创建一个线程池,固定数量为 5。 */publicclassThreadPoolConfig{privatestaticfinalintTHREAD_POOL_SIZE=5;privateExecutorServiceexecutorService;publicThreadPoolConfig(){executorService=Executors.newFixedThreadPool(THREAD_POOL_SIZE)...
importorg.slf4j.Logger;importorg.slf4j.LoggerFactory;publicfinalclassCosmosApp{/** For application to log INFO and ERROR. */privatestaticLogger logger = LoggerFactory.getLogger(CosmosApp.class.getSimpleName());privateCosmosApp(){// not called}/** * Main. *@paramargs Command line arguments *...
packagecom.microsoft.azure.samples;importjava.io.Serializable;importjavax.faces.view.ViewScoped;importjavax.inject.Named;importlombok.Getter;importlombok.Setter;@Named("indexcontroller")@ViewScopedpublicclassIndexControllerimplementsSerializable{privatestaticfinallongserialVersionUID =8485377386286855408L...