Przykłady do wpisu o nowej składni switch w Javie 13
String formatted = | |
switch (obj) { | |
case Integer i -> String.format("int %d", i); | |
case Byte b -> String.format("byte %d", b); | |
case Long l -> String.format("long %d", l); | |
case Double d -> String.format("double %f", d); | |
case String s -> String.format("String %s, s); | |
default -> String.format("Object %s", obj); | |
}; |
public class SwitchExpressions { | |
public static void main(String[] args) { | |
DaysOfWeek day = SUNDAY; | |
System.out.println("Is it a weekend?"); | |
// #1 old way | |
switch(day) { | |
case SUNDAY: | |
case SATURDAY: | |
System.out.println("Yes!"); | |
break; | |
case FRIDAY: | |
System.out.println("Almost!"); | |
break; | |
case MONDAY: | |
case TUESDAY: | |
System.out.println("No"); | |
default: | |
System.out.println(", but it is closer and closer"); | |
} | |
// #2 new way | |
switch (day) { | |
case SUNDAY, SATURDAY -> System.out.println("Yes!"); | |
case FRIDAY -> System.out.println("Almost!"); | |
case MONDAY, TUESDAY -> System.out.println("No"); | |
default -> System.out.println("No, but it is closer and closer"); | |
} | |
} | |
} |
public class SwitchExpressionsFive { | |
public static void main(String[] args) { | |
DaysOfWeek day = SUNDAY; | |
System.out.println("Is it a weekend?"); | |
System.out.println(switch (day) { | |
case SUNDAY, SATURDAY -> "Yes!"; | |
case FRIDAY -> "Almost!"; | |
case MONDAY, TUESDAY -> "No"; | |
default -> "No, but it is closer and closer"; | |
}); | |
} | |
} |
public class SwitchExpressionsFour { | |
public static void main(String[] args) { | |
DaysOfWeek day = SUNDAY; | |
System.out.println("Is it a weekend?"); | |
String isWeekend = switch(day) { | |
case SUNDAY: | |
case SATURDAY: | |
yield "Yes!"; | |
case FRIDAY: | |
yield "Almost!"; | |
case MONDAY: | |
System.out.println("Yw, it's start of the week"); | |
case TUESDAY: | |
yield "No"; | |
default: | |
yield "No, but it is closer and closer"; | |
}; | |
System.out.println(isWeekend); | |
} | |
} |
public class SwitchExpressionsThree { | |
public static void main(String[] args) { | |
DaysOfWeek day = SUNDAY; | |
System.out.println("Is it a weekend?"); | |
String isNewWeekend = switch (day) { | |
case SUNDAY, SATURDAY -> "Yes!"; | |
case FRIDAY -> "Almost!"; | |
case MONDAY, TUESDAY -> "No"; | |
default -> { | |
var x = 10 + 13; | |
// do something | |
yield "No, but it is closer and closer"; | |
} | |
}; | |
System.out.println(isNewWeekend); | |
} | |
} |
public class SwitchExpressionsTwo { | |
public static void main(String[] args) { | |
DaysOfWeek day = SUNDAY; | |
System.out.println("Is it a weekend?"); | |
// #1 old way | |
String isWeekend; | |
switch(day) { | |
case SUNDAY: | |
case SATURDAY: | |
isWeekend = "Yes!"; | |
break; | |
case FRIDAY: | |
isWeekend = "Almost!"; | |
break; | |
case MONDAY: | |
case TUESDAY: | |
isWeekend = "No"; | |
break; | |
default: | |
isWeekend = "No, but it is closer and closer"; | |
} | |
System.out.println(isWeekend); | |
// #2 new way | |
String isNewWeekend = switch (day) { | |
case SUNDAY, SATURDAY -> "Yes!"; | |
case FRIDAY -> "Almost!"; | |
case MONDAY, TUESDAY -> "No"; | |
default -> "No, but it is closer and closer"; | |
}; | |
System.out.println(isNewWeekend); | |
} | |
} |
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