Java - Switch (case)

> Procedural Languages > Java

1 - About

Switch branching statement in Java

You need to use primitive type after the case word. ie int in place of Integer

3 - Example

  • Switch (Case when)
int month = 8;
String monthString;
switch (month) {
	case 1:  monthString = "January";
			 break;
	case 2:  monthString = "February";
			 break;
	case 3:  monthString = "March";
			 break;
	case 4:  monthString = "April";
			 break;
	case 5:  monthString = "May";
			 break;
	case 6:  monthString = "June";
			 break;
	case 7:  monthString = "July";
			 break;
	case 8:  monthString = "August";
			 break;
	case 9:  monthString = "September";
			 break;
	case 10: monthString = "October";
			 break;
	case 11: monthString = "November";
			 break;
	case 12: monthString = "December";
			 break;
	default: monthString = "Invalid month";
			 break;
}
System.out.println(monthString);
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4 - Support

4.1 - Constant expression required

In a constant expression, you need to use a primitive type. Ie int in place of integer

Example in a function:

private String[] parseCommand(String code) {
 
	// final Integer defaultState = 1; // Not good
	final int defaultState = 1; // Good
 
	Integer state = defaultState;
	for (byte b : code.getBytes()){
		switch (state) {
			case defaultState:
				break;
		}
	}
 
	return new String[0];
}
lang/java/switch.txt · Last modified: 2019/08/16 13:56 by gerardnico