switch (variable/expression) {
case value1:
 // statements
 break;
case value2:
 // statements
 break;
 .. .. ...
 .. .. ...
default:
 // statements
}

Here the variable should be premitive datatype like byte,int short,char .floating point is not allowed .For more follow the link
https://www.programiz.com/java-programming/switch-statement

another link
https://www.javatpoint.com/java-switch

Syntax

Switch(variable)
{
 case 0:
 .
 .
 . 
 case n-1:
 default:
}

This is a type of control statement in which we are a single variable is checked for multiple values and if neither value matches the code corresponding to default is executed.

• Switch case does not allow variables to be taken as the case value.
• Only uniques case values are acceptable.
• Each case is suffixed by a break statement, to make sure that only the matched case code executes

import static java.lang.System.out; 
class Csharpcorner 
{ 
 public static void main(String[] args) 
 { 
 int i=0; 
 switch(i) 
 { 
 case 0: 
 case 1: 
 case 2: 
 case 3: 
 case 4: 
 case 5: 
 case 6:out.print(i); 
 break; 
 default: out.print("No value"); 
 } 
 } 
}

For a detailed tutorial on Java Control and Loop Statements please visit https://www.c-sharpcorner.com/article/java-loops-and-control-statements/