java 14

In Java 12 and Java 13, Switch Expressions were added as preview features, and in Java 14 they became a standard feature. The Switch Expressions feature extends regular Java switch statements and can be used as either a statement or an expression. The entire switch block evaluates to a value that can then be assigned…

class Test { public static void main(String[] args) { String name = null; System.out.println(name.toUpperCase()); } } Output: Exception in thread “main” java.lang.NullPointerException at com.example.Test.main (Test.java:9)   Here, we got an error message that the NPE has occurred on line 9. Unfortunately, we can’t conclude which value exactly was null from the message. class Test { public static…

class Test { public static void main(String[] args) { Vehicle vehicle = new Car(); if (vehicle instanceof Car) { Car car = (Car) vehicle; car.openTrunk(); // other code … } else if (vehicle instanceof Truck) { Truck truck = (Truck) vehicle; truck.removeTrailer(); // other code … } } } class Test { public static void…

class User { private String name; private String username; private String membershipType; private String address; public User(String name, String username, String membershipType, String address) { this.name = name; this.username = username; this.membershipType = membershipType; this.address = address; } public String getName() { return name; } public void setName(String name) { this.name = name; } public…

String multilineText= “”” Hi, this is one simple example of a multiline text”””; class Test { public static void main(String[] args) { String example = “{\”key1\”:\”value1\”,\”key2\”:” + “\”value2\”,\”key3\”:\”value3\”}”; System.out.println(example); } } Output: {“key1″:”value1″,”key2″:”value2″,”key3″:”value3”}   Now, let’s use a Text Block: class Test { public static void main(String[] args) { String example = “”” { “key1”:…