importjava.util.HashMap;importjava.util.Map;publicclassConfigurations{// 定义静态 MapprivatestaticfinalMap<String,String>configurations=newHashMap<>();// 静态初始化块static{configurations.put("host","localhost");configurations.put("port","8080");configurations.put("username","admin");configurations....
第一种:使用静态块进行初始化 public static final Map<String, String> staticMap; static { staticMap = new HashMap<String, String>(); staticMap.put("1", "one"); staticMap.put("2", "two"); staticMap.put("3", "three"); staticMap.put("4", "four"); staticMap.put("5", "five"...
方法一:static初始化器 方法二:实例初始化(匿名子类) 下面是描述上面两种方法的例子 import java.util.HashMap; import java.util.Map; public class Test{ private static final Map<Integer, String> myMap = new HashMap<Integer, String>(); static { myMap.put(1, "one"); myMap.put(2, "two");...
JavaCollectionsclass provide methods to initializeemptyMap(),singletonMap()andunmodifiableMap(). Note that all these methods returnimmutable map Map<String,Integer>emptyMap=Collections.emptyMap();Map<String,Integer>singletonMap=Collections.singletonMap("A",1);singletonMap.put("B",2);// Throw Unsupporte...
("DriverManager.initialize: jdbc.drivers = "+drivers);if(drivers==null||drivers.equals("")){return;}String[]driversList=drivers.split(":");println("number of Drivers:"+driversList.length);for(String aDriver:driversList){try{println("DriverManager.Initialize: loading "+aDriver);Class.forName(...
jmap(Memory Map)和jhat(Java Heap Analysis Tool) jmap用来查看堆内存使用状况,一般结合jhat使用。 jmap语法格式如下: jmap [option] pid jmap [option] executable core jmap [option] [server-id@]remote-hostname-or-ip 如果运行在64位JVM上,可能需要指定-J-d64命令选项参数。 jmap -permstat pid 打印...
importjava.util.LinkedHashMap;importjava.util.Map;importjava.util.Properties;importstaticorg.apache.commons.codec.binary.Base64.encodeBase64String;publicclassXalanTemplatesImpl{/*** com.anbai.sec.classloader.TestAbstractTranslet类字节码*/publicstaticfinalbyte[] CLASS_BYTES =newbyte[]{-54, -2, -70...
Java里面的类加载机制,可以说是Java虚拟机核心组件之一,掌握和理解JVM虚拟机的架构,将有助于我们站在底层原理的角度上来理解Java语言,这也是为什么我们学习一个新的知识时,如果不理解原理全靠死记硬背,我相信过不了几天便会忘记的一干二净。 Java是一门跨平台的语言,而JVM虚拟机则在这中间扮演了非常重要的角色,...
protected Map<String,Object> desktopProperties protected PropertyChangeSupport desktopPropsSupport 构造方法摘要 Toolkit() 方法摘要 void addAWTEventListener(AWTEventListener listener, long eventMask) 添加一个 AWTEventListener,以接收与给定 eventMask 一致的系统范围内指派的所有 AWTEvent。 void addPropertyChan...
Initialize your member variable, mapView, and add it to the JavaFX UI. App.java Expand 46 47 48 49 50 51 52 53 // create a JavaFX scene with a stack pane as the root node, and add it to the scene StackPane stackPane = new StackPane(); Scene scene = new Scene(stackPane); stage...