![]() When there is no default block in the switch block ("Sorry none of your cases matched") break ![]() ("Congratulations here is the case 8 executed") break ("Congratulations here is the case 4 executed") break ("Congratulations here is the case 3 executed") break When the value of the Switch expression is matched with a Case value The below examples clearly show how the Case statement work in Java. return ‘true’ in any of the Case statements, then the code of a particular block is executed, and then execution exits the Switch block. If the value of any case is matched with the expression, i.e. false’ is returned at the end of every case, then the code inside the ‘default’ is executed. If the value is not matched until the last step, i.e. It shows how matching the expression defined in the Switch statement is matched with the Case value starting from the top until the last steps. The above flow diagram clearly shows how the Switch and Case statement works in Java. default is an optional case and executed if none of the case values matches the expression There can be as many Cases as the user wants in a Switch block same data type for switch expression and case value Case value1: Syntax of Switch Case Statement in Java switch (expression) Beak and default keywords are optional in Switch blocks.If the break is not used in any case statements, then there would be no error instead, all the cases proceeding with the matching case will be executed. Break keyword in each Case is used to terminate that particular sequence of statements of that case.Variables are not allowed for the Case value.The data type of variable of switch statement needs to be the same as the Case statement value.Duplicate values in the Case statements are not allowed.There can be any number of Case statements in a single Switch block.There can be multiple switch blocks in the program, depending on the different conditions.If none of the value matches case values, then the default statement defined in the Switch block is executed otherwise, nothing got executed. How Does Case Statement work in Java?Īs described above, Case in a particular Switch statement is executed when the value of the expression matches with the Case value. Though the default and break keywords are not mandatory in Switch-Case statements. If any of the values of the Case does not match with the expression, then the default statement is executed. With the Java JDK7, the value of the case can also be String, Wrapper and enumerated types. The Case values in Java can be byte, int, short, byte data types. It performs the execution of statement/statements when the value of the expression is matched with the case value, and the code of the particular statements is ended by break keyword. The case is a keyword that is used with the Switch statement. O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.The switch statement is a branch statement. Get Java For Dummies Quick Reference now with the O’Reilly learning platform. All the case groups together, however, are defined as a block marked with. Instead, each case group begins with the case keyword and ends with the case keyword that starts the next case group. The case groups are not true blocks marked with braces. Its statements are executed only if none of the previous case constants matches the switch expression. The default group, which is optional, is like a catch-all case group. The last line of each case group is a break statement, which causes the entire switch statement to end. Then you code one or more statements that you want executed if the value of the switch expression equals the constant. Each group begins with the word case, followed by a constant (usually, a numeric, character, or string literal) and a colon. You can code as many case groups as you want or need. It can’t be a long or a floating-point type.Įach grouping of code lines that starts with the case keyword and ends with a break statement is a case group. ![]() The expression must evaluate to an int, short, byte, or char. The basic form of the switch statement is this: A switch statement is useful when you need to select one of several alternatives based on the value of an integer, a character, or a String variable.
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