case 'A':

doSomething(); // Triggered if ch == 'A'

break;

case 'B':

case 'C':

doSomethingElse(); // Triggered if ch == 'B' or ch == 'C'

break;

default:

doSomethingDifferent(); // Triggered in any other case

break;

}

Since Java 14 it has become possible to use switch expressions, which

use the new arrow syntax:

var result = switch (ch) {

case 'A' -> Result.GREAT;

case 'B', 'C' -> Result.FINE;

default -> throw new ThisIsNoGoodException();

};

Alternatively, there is a possibility to express the same with the yield

statement, although it is recommended to prefer the arrow syntax because

it avoids the problem of accidental fall throughs.

var result = switch (ch) {

case 'A':

yield Result.GREAT;

case 'B':

case 'C':

yield Result.FINE;

default:

throw new ThisIsNoGoodException();

};

Iteration statements are statements that are repeatedly executed when a

given condition is evaluated as true. Since J2SE 5.0, Java has four

forms of such statements. The condition must have type boolean or

Boolean, meaning C's

while (1) {

doSomething();

}

results in a compilation error.

In the while loop, the test is done before each iteration.

while (i < 10) {

doSomething();

}

In the do ... while loop, the test is done after each iteration.

Consequently, the code is always executed at least once.

// doSomething() is called at least once