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...
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"...
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 ”。final类型的就别强转了，试试类似Integer.valueof()、String.valueof()、Integer.parseInt()等类似的方法转换。代码是如何的 ，，，case 需要常量。。。
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...
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...
如:finalinta1 = 1;casea1;//正确finalinta2;casea2;//异常 The local variable i may not have been initializedfinalInteger = 3;casea3;//异常 case expressions must be constant expressionsfinalStringa4 = "hello";casea4;//正确 2.switch在进入某条件分支后(case或default)会一直往下执行代码,直到遇到...
Expands the expressiveness and applicability of switch expressions and statements by allowing patterns to appear in case labels. Allows the historical null-hostility of switch to be relaxed when desired. Increases the safety of switch statements by requiring that pattern switch statements cover all possi...
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 ...
下面代码会报case expressions must be constant expressions错误 case语句要求的是常量,我们会想NUM声明的就是常量啊,我们需要...