Java Switch Case conditional

Java's Switch Case statements can be understood as a branch
example assumes that there are four people playing mahjong number 1234 corresponds to the name John Doe, Wang Wu, Zhao six

data structure

Switch (expression The) { 
    case value: 
       // statements 
       BREAK; // optional 
    case value: 
       // statements 
       BREAK; // optional 
    // you can have any number of case statement 
    default: // optional 
       // statements 
}

Sample Code

code = 2 int; 
Switch (code) { 
	Case. 1: 
		System.out.println ( "I am John Doe"); 
		BREAK; 
	Case 2: 
		System.out.println ( "I am John Doe"); 
		BREAK; 
	Case. 3 : 
		System.out.println ( "I am the king five"); 
		BREAK; 
	Case 4: 
		System.out.println ( "I'm Zhao six"); 
		BREAK; 
	default: 
		System.out.println ( "I'm just a spectator." ); 
}

Export

I'm John Doe

break that out, when a case is satisfied, stop below the other case.

The above process is executed

Q: code How much is 
the implementation of case 1 discovery does not satisfy the 
execution case 2 found met, exit switch immediately

If you do not write break

code = 2 int; 
Switch (code) { 
	Case. 1: 
		System.out.println ( "I am John Doe"); 
	Case 2: 
		System.out.println ( "I am John Doe"); 
	Case. 3: 
		the System.out .println ( "I am the king five"); 
	Case 4: 
		System.out.println ( "I'm Zhao six"); 
	default: 
		System.out.println ( "I'm just a spectator"); 
}

Export

I'm John Doe 
I was king five 
I was Zhao six 
I'm just a spectator

Procedure flow chart

Q: code How much is 
the implementation of case 1 discovery does not satisfy the 
execution case 2 was found to meet the output 
execution case 3 judges whether or not the output 
execution case 4 judges whether or not the output 
execution is judged whether or not default, output

If the current case does not break upon successful determination, subsequent case will be executed.

Important:
1. Switch control process, a bit like if else but the efficiency is determined in the case of multilayer if else higher than
2. Break critical
Case 3. Switch in value can not be repeated case 1: case next to continue 1:

https://java-er.com/blog/java-switch-case/