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public class App { public static void main(String[] args) { // … } } public class App { public static void main(String[] args) { for(String s : args) { System.out.println(s); } } } public static void main(String[] args) public static void main(String []args)  public static void main(String args[]) public static void main(String… args) static public void main(String[] args) public static final void main(String[] args) final public static void main(String[] args)

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class Vehicle { int maxSpeed = 250; public void printMaxSpeed() { System.out.println(“Max speed: ” + maxSpeed); } } class Car extends Vehicle { int maxSpeed = 300; @Override public void printMaxSpeed() { System.out.println(“Max speed: ” + maxSpeed); } } class Test { public static void main(String[] args) { Vehicle vehicle = new Car(); // upcasting…

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public class Test { public static void main(String[] args) { String str = “Learn Java with alegrucoding.com”; String result = str.replaceAll(“\\s”, “”); System.out.println(result); } } Output: LearnJavawithalegrucoding.com import org.apache.commons.lang3.StringUtils; public class Test { public static void main(String[] args) { String str = “Learn Java with alegrucoding.com”; String result = StringUtils.deleteWhitespace(str); System.out.println(result); } } Output: LearnJavawithalegrucoding.com

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{ “firstName” : “John”, “lastName”: “Doe”, “gender”: “Male”, “state”: “Texas” } public class Person { private String firstName; private String lastName; private String state; // constructors, getters and setters } public class Person { private String firstName; private String lastName; private String gender; <<<< private String state; } import com.fasterxml.jackson.annotation.JsonIgnoreProperties; @JsonIgnoreProperties(ignoreUnknown = true) public class…

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{ “firstName”:”John”, “lastName”:”Doe”, “username”:”johnDoe#1″, “membershipType”:”Platinum”, “address”: { “street”:”5th Avenue”, “city”:”New York”, “state”:”New York” } } import lombok.*; @Data @NoArgsConstructor @AllArgsConstructor public class Customer { private String firstName; private String lastName; private String membershipType; private Address address; } @Data @NoArgsConstructor @AllArgsConstructor public class Address { private String street; private String city; private String state; } import…

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