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...
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...
而当使用枚举类型作为条件时,我们常常会遇到“Constant expression required”的报错问题,这给程序开发造成了不小的困扰。 switch 语句中的变量类型可以是: byte、short、int 或者 char。从 Java SE 7 开始,switch 支持字符串 String 类型了,同时 case 标签必须为字符串常量或字面量。我们创建一个枚举: java 复制...
Home Question Java switch statement: Constant expression required, but it IS constant Below code is self-explanatory, We can use an enum with a switch case: /** * */ enum ClassNames { STRING(String.class, String.class.getSimpleName()), BOOLEAN(Boolean.class, Boolean.class.getSimpleName()...
然后,我想要一种基于常量获得相关字符串的方法: 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,我会得到一个constant expression required三个...
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...
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Warns about division by the constant integer 0, for example: int divideByZero = 42 / 0; empty Warns about empty statements afterifstatements, for example: class E { void m() { if (true) ; } } fallthrough Checks the switch blocks for fall-through cases and provides a warning message ...
Warns about division by the constant integer 0, for example: int divideByZero = 42 / 0; empty Warns about empty statements afterifstatements, for example: class E { void m() { if (true) ; } } fallthrough Checks the switch blocks for fall-through cases and provides a warning message ...
{ "command": "java.server.mode.switch", "title": "%java.server.mode.switch%", "category": "Java" }, { "command": "java.projectConfiguration.update", "title": "%java.projectConfiguration.update%", "category": "Java" }, { "command": "java.project.import.command", "title": "%...