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...
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 { /** * 400 */ BAD_REQUEST(HttpServletResponse.SC_...
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...
public static final String VALIDATOR_ID "javax.faces.RegularExpression"javax.faces.validator.RequiredValidator public static final String VALIDATOR_ID "javax.faces.Required"javax.faces.validator.Validator public static final String NOT_IN_RANGE_MESSAGE_ID "javax.faces.validator.NOT_IN_RANGE"javax...
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...
http://www.apache.org/licenses/LICENSE-2.0Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an"AS IS"BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Licenseforthe ...
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...
Deep Inside Lambda Expression What does a lambda expression look like inside Java code and inside the JVM? It is obviously some type of value, and Java permits only two sorts of values: primitive types and object references. Lambdas are obviously not primitive types, so a lambda expression mus...