Merge pull request #13099 from etrandafir93/features/BAEL-5819-java_collections_pecs
BAEL-5819: java collections pecs
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package com.baeldung.collections.pecs;
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import java.util.Arrays;
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import java.util.List;
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import com.baeldung.collections.pecs.model.Customer;
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import com.baeldung.collections.pecs.model.Operator;
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import com.baeldung.collections.pecs.model.User;
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public class ProducerExtendsConsumerSupers {
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public void producerExtends() {
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List<Operator> operators = Arrays.asList(new Operator("sam"), new Operator("daniel"));
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List<Customer> customers = Arrays.asList(new Customer("arys"), new Customer("cristiana"));
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// sendEmails(operators); --> will not compile!
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sendEmailsFixed(operators);
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sendEmailsFixed(customers);
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}
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private void sendEmails(List<User> users) {
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for (User user : users) {
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System.out.println("sending email to " + user);
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}
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}
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private void sendEmailsFixed(List<? extends User> users) {
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for (User user : users) {
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System.out.println("sending email to " + user);
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}
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}
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public void consumerSupers() {
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List<Operator> allOperators = Arrays.asList(new Operator("tom"));
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List<User> allUsers = Arrays.asList(new Operator("tom"), new Customer("spencer"));
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// addUsersFromMarketingDepartment(allUsers); --> will not compile!
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addUsersFromMarketingDepartmentFixed(allOperators);
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addUsersFromMarketingDepartmentFixed(allUsers);
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}
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private void addUsersFromMarketingDepartment(List<Operator> users) {
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users.add(new Operator("john doe"));
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users.add(new Operator("jane doe"));
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}
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private void addUsersFromMarketingDepartmentFixed(List<? super Operator> users) {
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users.add(new Operator("john doe"));
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users.add(new Operator("jane doe"));
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}
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private void addUsersAndSendEmails(List<User> users) {
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users.add(new Operator("john doe"));
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for (User user : users) {
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System.out.println("sending email to: " + user);
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}
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}
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}
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package com.baeldung.collections.pecs.model;
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public class Customer extends User {
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public Customer(String name) {
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super(name);
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}
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}
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package com.baeldung.collections.pecs.model;
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public class Operator extends User {
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public Operator(String name) {
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super(name);
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}
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}
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package com.baeldung.collections.pecs.model;
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public class User {
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private final String name;
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public User(String name) {
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this.name = name;
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}
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}
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