case CLICK_QUERY: query(); break; case CLICK_RESET: reset(); break; } } 编译时一直报错:CLICK_QUERY 和CLICK_RESET——case expressions must be constant expressions 二、解决问题 case后面必须跟常量,必须要常量,将上面两个变量声明为final即可。 private final int CLICK_QUERY = 1; private final int...
1） T = new String[2]; // 不允许，T是常量，不能改变其取值 2） T[0] = "123"; // 允许，因为数组成员取值并未被限定为不可改变（即不是常量）所以，你在switch（）中使用 T[i] 作为case值就会引发编译错误“case expressions must be constant expressions ”。
case CLICK_QUERY: query(); break; case CLICK_RESET: reset(); break; } } 编译时一直报错:CLICK_QUERY 和CLICK_RESET——case expressions must be constant expressions 二、解决问题 case后面必须跟常量,必须要常量,将上面两个变量声明为final即可。 private final int CLICK_QUERY = 1; private final int...
下面代码会报case expressions must be constant expressions错误 classA{publicstaticfinalintNUM=2+newRandom().nextInt(2);static{System.out.println("A static block NUM="+NUM);}publicstaticvoidtest(){intnumber=2;switch(number){caseNUM:// 该句就会报如上错误}}} case语句要求的是常量,我们会想NUM...
今天在代码中想对Java switch case 和枚举类型Enum对象进行联合使用,但发现有Eclipse中异常提示信息:case expressions must be constant expressions,导致编译始终过不去。 枚举类型定义如下: public enum TradeStatus { CLOSE(-1, "已关闭"), NO_TRADE(0, "未创建"), CREATE(1, "拍下"), PAY(2, "已付款...
编译时一直报错:CLICK_QUERY 和CLICK_RESET——case expressions must be constant expressions 解决问题 case后面必须跟常量,必须要常量,将上面两个变量声明为final即可。 private final int CLICK_QUERY = 1; private final int CLICK_RESET = 2; 2).下面是switch的简单写法: ...
case:表示条件分支,case后面跟一个常量,每个case后面的值必须不一样。case的个数可以为0个。 default:表示默认分支,default可以省略,通常放在最后。 break:表示“停止”,跳出当前switch语句。 二、switch支持的数据类型 switch()括号中的表达式的结果的类型只能是特定类型,我们将一个double类型的变量放入,发现编译报错...
Youmustinclude adefaultcase, even if you havecasefor every known value of theenum; seeWhy is default required for a switch on an enum? Thecaselabels must all be explicitenumvalues, not expressions that evaluate toenumvalues. 1 - The constant expression restrictions can be summarized as follo...
The values in each case statement must becompile-time constant values of the same data type as the switch value. This means you can only useliterals, enum constants or final constant variablesof the same data type. Final constant variable is marked with final modifier and initialized with a ...
Proposal: the switch statement should be enhanced thus:The switch expression must be of type char, byte, short, int, or String. All case labels must be constant expressions—the expressions must contain only literals or named constants initialized with constant expressions—and must be assignable ...