如果有两个枚举中都有同一个变量(比如GREEN)的话, 则无法确定判断的先后顺序. private void Test(ColorType type){ switch (type){ case GREEN: break; case RED: break; case ORANGE: break; default: break; } } constant expression required private void Test(int type){ switch (type){ case ColorTy...
It throws a “Constant expression required” error when it’s compiled and it points to the case p: line, however, it also throws it for f: if I switch them so I must be doing something completely off. 解决方案 Yes, a case expression has to be a constant (or an enum constant name...
public static String lookup(int constant) { switch (constant) { case Foo.BAR: return "bar"; case Foo.BAZ: return "baz"; case Foo.BAM: return "bam"; default: return "unknown"; } } 但是,当我编译时,我在 3 个案例标签中的每一个上都收到 constant expression required 错误。 我知道编译...
Java中switch语句的用法及constant expression required错误解析 1. Java中switch语句的用法 在Java中,switch语句是一种多分支选择结构,用于基于某个变量的值选择执行不同的代码块。其基本语法如下: java switch (expression) { case value1: // 代码块1 break; case value2: // 代码块2 break; // 可以有多个...
package com.constant; import lombok.Getter; import javax.servlet.http.HttpServletResponse; import java.text.MessageFormat; /** * 错误码定义 * * @author jockeys * @since 2020/4/6 */ @Getter public enum ErrorCodeEnum implements ErrorCode { ...
Enum EnumConstantNotPresentException EnumControl EnumControl.Type Enumeration EnumMap EnumSet EnumSyntax Environment EOFException Error ErrorHandler ErrorListener ErrorManager ErrorType EtchedBorder Event Event EventContext EventDirContext EventException EventFilter EventHandler Event...
if (boolean expression){expression1} else{expression2} example: int y = 10; int x = (y>5) ? (y*2) : (y*3); //equals to following code int x; if(y>5){x = y*2;} else{x=y*3;} expression 1 and expression 2 must be a return value, not a statement. example as followin...
Over time, optional packages may become required in an edition as the marketplace requires them. ORB Object Request Broker. A library than enables CORBA objects to locate and communicate with one another. OS principal A principal native to the operating system on which the Java platform is execu...
When referencing an enum constant with an expression, you use aStringliteral. For example, consider this Enum class: public enum Suit {hearts, spades, diamonds, clubs} To refer to theSuitconstant,Suit.heartswith an expression, you use theStringliteral,"hearts". Depending on the context, theSt...
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