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giaunvgiaunv
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Update Spring Boot JSP
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31 files changed

Lines changed: 993 additions & 16 deletions

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‎golang-examples/golang-core/go.mod‎

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‎golang-examples/golang-core/semaphore.go‎

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package main
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import (
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"net/http"
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)
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var sem = make(chan int, 100)
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func Serve(queue chan *Request) {
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for req := range queue {
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sem <- 1
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go func(req *http.Request) {
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process(req)
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<- sem
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}(req)
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}
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http.HandleFunc()
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}
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‎golang-examples/rest-gin-gorm/rest-gin-gorm‎

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‎golang-examples/system-design-golang/go.mod‎

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module system-design
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go 1.13
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require golang.org/x/time v0.0.0-20190921001708-c4c64cad1fd0

‎golang-examples/system-design-golang/go.sum‎

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golang.org/x/time v0.0.0-20190921001708-c4c64cad1fd0 h1:xQwXv67TxFo9nC1GJFyab5eq/5B590r6RlnL/G8Sz7w=
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golang.org/x/time v0.0.0-20190921001708-c4c64cad1fd0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=

‎golang-examples/system-design-golang/rate_limiting.go‎

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package main
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import (
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"fmt"
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"net/http"
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"log"
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"golang.org/x/time/rate"
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)
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var limiter = rate.NewLimiter(2, 5)
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func throttle(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if !limiter.Allow() {
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http.Error(w, http.StatusText(http.StatusTooManyRequests), http.StatusTooManyRequests)
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log.Fatalln(http.StatusText(http.StatusTooManyRequests))
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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func handler(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "Hello, World!")
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}
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func main() {
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mux := http.NewServeMux()
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mux.HandleFunc("/", handler)
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err := http.ListenAndServe(":8080", throttle(mux))
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if err != nil {
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panic(err)
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}
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}

‎golang-examples/system-design-golang/results.gob‎

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‎java-examples/java-core/src/main/java/com/hellokoding/java/collections/ArrayListIterationExample.java‎

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package com.hellokoding.java.collections;
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import java.util.*;
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public class ArrayListIterationExample {
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public static void main(String[] args) {
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List<Integer> arrayList1 = new ArrayList<>(List.of(1, 2, 3));
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// Iterate forward with for-index loop
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for(int i=0; i<arrayList1.size(); i++){
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int ele = arrayList1.get(i);
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System.out.printf("%d ", ele); // 1 2 3
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}
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System.out.println();
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// Iterate backward with for-index loop
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for(int i=arrayList1.size()-1; i>=0; i--){
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int ele = arrayList1.get(i);
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System.out.printf("%d ", ele); // 3 2 1
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}
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System.out.println();
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// Iterate forward with for-each loop
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for(int ele : arrayList1){
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System.out.printf("%d ", ele); // 1 2 3
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}
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System.out.println();
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// Iterate forward with forEach(Consumer) method
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arrayList1.forEach(e -> System.out.printf("%d ", e)); // 1 2 3
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System.out.println();
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// Iterate forward with iterator() method
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Iterator<Integer> iterator = arrayList1.iterator();
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while (iterator.hasNext()){
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System.out.printf("%d ", iterator.next()); // 1 2 3
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}
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System.out.println();
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// Iterate backward with listIterator() method
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ListIterator<Integer> listIterator = arrayList1.listIterator(arrayList1.size());
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while (listIterator.hasPrevious()){
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System.out.printf("%d ", listIterator.previous()); // 3 2 1
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}
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}
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}

‎java-examples/java-core/src/main/java/com/hellokoding/java/collections/ArrayListSortExample.java‎

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package com.hellokoding.java.collections;
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import java.time.LocalDate;
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import java.util.*;
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public class ArrayListSortExample {
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public static void main(String[] args) {
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List<Integer> arrayList1 = new ArrayList<>(List.of(3, 1, 2));
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// sort an ArrayList of numbers in ascending order with Collections.sort()
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Collections.sort(arrayList1);
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System.out.println(arrayList1); // [1, 2, 3]
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// sort an ArrayList of numbers in descending order with Collections.sort()
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Collections.sort(arrayList1, Comparator.reverseOrder());
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System.out.println(arrayList1); // [3, 2, 1]
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List<String> arrayList2 = new ArrayList<>(List.of("c", "a", "b"));
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// sort an ArrayList of Strings in alphabetical order with sort()
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arrayList2.sort(Comparator.naturalOrder());
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System.out.println(arrayList2); // [a, b, c]
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// sort an ArrayList of Strings in reverse alphabetical order with sort()
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arrayList2.sort(Comparator.reverseOrder());
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System.out.println(arrayList2); // [c, b, a]
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LocalDate ld1 = LocalDate.of(2019, 3, 1);
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LocalDate ld2 = LocalDate.of(2019, 1, 1);
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LocalDate ld3 = LocalDate.of(2019, 2, 1);
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List<LocalDate> arrayList3 = new ArrayList<>(List.of(ld1, ld2, ld3));
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// sort an ArrayList of Dates in chronological order
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arrayList3.sort(Comparator.naturalOrder());
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System.out.println(arrayList3); // [2019-01-01, 2019-02-01, 2019-03-01]
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// sort an ArrayList of Dates in reverse chronological order
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arrayList3.sort(Comparator.reverseOrder());
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System.out.println(arrayList3); // [2019-03-01, 2019-02-01, 2019-01-01]
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}
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static class Employee implements Comparable<Employee> {
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private final Integer id;
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private final String name;
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public Employee(Integer id, String name) {
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this.id = id;
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this.name = name;
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}
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public Integer getId() {
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return id;
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}
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public String getName() {
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return name;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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Employee employee = (Employee) o;
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return Objects.equals(id, employee.id) &&
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Objects.equals(name, employee.name);
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}
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@Override
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public int hashCode() {
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return Objects.hash(id, name);
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}
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@Override
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public int compareTo(Employee o) {
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return Comparator.comparing(Employee::getName)
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.compare(this, o);
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}
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}
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}

‎java-examples/java-core/src/main/java/com/hellokoding/java/collections/ArrayListUserDefinedObjectsExample.java‎

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package com.hellokoding.java.collections;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Objects;
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public class ArrayListUserDefinedObjectsExample {
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public static void main(String[] args) {
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Book book1 = new Book(1, "Spring Boot In Practice");
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Book book2 = new Book(2, "Algorithms Bootcamp");
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List<Book> books = new ArrayList<>();
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books.add(book1);
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books.add(book2);
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System.out.println(books.contains(book1)); // true
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System.out.println(books.contains(book2)); // true
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}
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static class Book {
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private final int id;
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private final String title;
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public Book(int id, String title) {
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this.id = id;
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this.title = title;
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}
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public int getId() {
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return id;
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}
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public String getTitle() {
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return title;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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Book book = (Book) o;
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return id == book.id &&
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Objects.equals(title, book.title);
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}
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@Override
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public int hashCode() {
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return Objects.hash(id, title);
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}
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}
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}

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