//使用 + 拼接String expletive="Expletive"; String PC13="deleted"; String message=expletive + PC13;//如果其中有数字那么会将数字转为String再拼接 //如果是多个字符串拼接还可以使用joinStringa="a";Stringb="b";Stringc=String.join(a,b,"c","de"); 注:Java的String并不是C++里的char[]而是char*...
RED("红色",1), GREEN("绿色",2), BLANK("白色",3), YELLO("黄色",4);// 成员变量privateString name;privateintindex;// 构造方法privateColor(String name,intindex){this.name = name;this.index = index; }// 普通方法publicstaticStringgetName(intindex){for(Color c : Color.values()) {if(...
而且 Java 要求必须先定义 enum 实例。 代码语言:javascript 复制 publicenumColor{RED("红色",1),GREEN("绿色",2),BLANK("白色",3),YELLO("黄色",4);// 成员变量privateString name;privateint index;// 构造方法privateColor(String name,int index){this.name=name;this.index=index;}// 普通方法public...
Methods inherited from class java.lang.Object getClass,notify,notifyAll,wait,wait,wait Constructor Detail Enum protected Enum(Stringname, int ordinal) Sole constructor. Programmers cannot invoke this constructor. It is for use by code emitted by the compiler in response to enum type declarations. ...
// 定义publicenumColor{BLACK,WHITE}// 使用publicclassMain{publicstaticvoidmain(String[]args){System.out.println(Color.BLACK);}}// 结果// BLACK 这样只是能够知道枚举简单的使用方法,不能看出枚举的特点和枚举的具体实现. 下面我们通过jad工具来反编译Color类, 通过jad -sjava Color.class反编译出一份java...
packagecom.lxk.enumTest;/*** Java枚举用法测试* * Created by lxk on 2016/12/15*/publicclassEnumTest{publicstaticvoidmain(String[]args){forEnum();useEnumInJava();}/*** 循环枚举,输出ordinal属性;若枚举有内部属性,则也输出。(说的就是我定义的TYPE类型的枚举的typeName属性)*/privatestaticvoidfor...
public static void main(String[] args) { if (args.length != 1) { System.err.println("Usage: java Planet <earth_weight>"); System.exit(-1); } double earthWeight = Double.parseDouble(args[0]); double mass = earthWeight/EARTH.surfaceGravity(); ...
Java.Lang Assembly: Mono.Android.dll Returns the enum constant of the specified enum class with the specified name. C# [Android.Runtime.Register("valueOf","(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum;","")] [Java.Interop.JavaTypeParameters(new System.String[] {"T extends java....
>constructor=cls.getDeclaredConstructor(String.class,int.class);// 获取访问权限constructor.setAccessible(true);// 实例化ObjectreflectColor=constructor.newInstance("name",0);}// 报错Exceptionin thread"main"java.lang.IllegalArgumentException:Cannotreflectively createenumobjects at java.lang.reflect.Constructor...
Java.Lang Assembly: Mono.Android.dll This is the common base class of all Java language enumeration classes. C#Copiar [Android.Runtime.Register("java/lang/Enum", DoNotGenerateAcw=true)] [Java.Interop.JavaTypeParameters(new System.String[] {"E extends java.lang.Enum<E>"})]publicabstractclass...