How to use switch statement in java

The switch case statement in Java determines whether a variable is equal to a value in a series of values. Each value is called a branch. Let's learn with the editor how to use the switch statement in Java.

The syntax format of the switch case statement is as follows:

switch(expression){
    case value :
       //语句
       break; //可选
    case value :
       //语句
       break; //可选
    //你可以有任意数量的case语句
    default : //可选
       //语句
}

The switch case statement has the following rules:

1. The variable type in the switch statement can be: byte, short, int or char.

Starting from Java SE 7, switch supports the String type, and the case label must be a string constant or literal.

2. The switch statement can have multiple case statements. Each case is followed by a value to be compared and a colon.

3. The data type of the value in the case statement must be the same as the data type of the variable, and it can only be a constant or literal constant.

4. When the value of the variable is equal to the value of the case statement, the statements after the case statement begin to execute, and the switch statement will not jump out until the break statement appears.

5. When encountering a break statement, the switch statement terminates. The program jumps to the statement following the switch statement for execution. The case statement does not have to contain a break statement. If no break statement occurs, the program continues execution of the next case statement until a break statement occurs.

6. The switch statement can contain a default branch, which is generally the last branch of the switch statement (it can be at any position, but it is recommended to be the last one). default is executed when no case statement is equal to the variable value. The default branch does not require a break statement.

7. When the switch case is executed, it will be matched first. If the match is successful, the value of the current case will be returned. Then, based on whether there is a break, it will be judged whether to continue output or jump out of the judgment.

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