Solutions Premiers Pas
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- Trevor Watkins
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1 Solutions Premiers Pas Solution 1: public class HelloWorld { System.out.println("Hello World!"); Solution 2 : public class HelloWorld { System.out.println(args[0]); Solution 3 : public class HelloWorldWithMethod{ public void Hello(){ System.out.print( You re Welcome! ); HelloWorldWithMethod s=new HelloWorldWithMethod(); s.hello(); Solution 4 : public class HelloWorldWithAttribut { String machaine; public void Hello(){ System.out.print(maChaine); HelloWorldWithAttribut s=new HelloWorldWithAttribut (); s.machaine= salut ; s.hello();
2 Solutions Généralités Solution 1 : class Somme{ public static void main(string[] arg){ int i, somme = 0; for (i = 1; i <= 100; i++){ somme += i; System.out.println("Voila la somme des 100 " + " premiers entiers : " + somme); Solution 2 public class Segment{ int extr1, extr2; Segment(int e1, int e2){ extr1 = e1; extr2 = e2; void ordonne(){ if (extr1 > extr2){ int tampon; tampon = extr1; extr1 = extr2; extr2 =tampon; int longueur(){ ordonne(); return extr2 - extr1; boolean appartient(int x){ return (x - extr1) * (x - extr2) <= 0; ordonne(); return "segment [" + extr1 + ", " + extr2 + "]"; public class EssaiSegment{ Segment s = new Segment(Integer.parseInt(argv[0]), Integer.parseInt(argv[1])); int point; System.out.println("Longueur du " + s + " : " + s.longueur()); point = Integer.parseInt(argv[2]); if (s.appartient(point)) System.out.println(point + " appartient au " + s); System.out.println(point + " n'appartient pas au " + s);
3 Solution 4 public class Factorielle{ int n, factorielle = 1 ; n = Integer.parseInt(argv[0]); for (int i = 2; i <= n; i++) factorielle *= i; System.out.println("Voila la factorielle de " + n + " : " + factorielle); Solution 5 Première méthode public class Palindrome{ static String inverse(string s){ int longueur = s.length(); char [] envers = new char[longueur]; int i; for (i = 0; i < longueur; i++) envers[i] = s.charat(longueur - i - 1); return new String(envers); public static void main(string[] arg) { String chaine = arg[0]; String autre = inverse(chaine); System.out.println("L'inverse de " + chaine + " est " + autre); if (autre.equals(chaine)) System.out.println(chaine + " est un palindrome"); System.out.println(chaine + " n'est pas un palindrome"); Deuxième méthode import java.io.*; public class Palindrome2{ static String inverse(string s){ int longueur = s.length(); char [] envers = new char[longueur]; int i; for (i = 0; i < longueur; i++) envers[i] = s.charat(longueur - i - 1); return new String(envers); public static void main(string[] arg) throws IOException{ BufferedReader entree = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Indiquez la chaîne de caractères"); String chaine = entree.readline(); String autre = inverse(chaine); System.out.println("L'inverse de \"" + chaine + "\" est \"" + autre + "\""); if (autre.equals(chaine)) System.out.println("\"" + chaine + "\" est un palindrome"); System.out.println("\"" + chaine + "\" n'est pas un palindrome");
4 Solution 6 public class Vecteur{ int abs, ord; Vecteur(int _abs, int _ord){ abs = _abs; ord = _ord; double longueur(){ return Math.sqrt(abs * abs + ord * ord); void addition(vecteur v){ abs = v.abs + abs; ord = v.ord + ord; static Vecteur addition(vecteur v1, Vecteur v2){ return new Vecteur(v1.abs + v2.abs, v1.ord + v2.ord); boolean pluspetitque(vecteur v){ return longueur() < v.longueur(); return "vecteur (" + abs + ", " + ord + ")"; public class EssaiVecteur{ Vecteur v1 = new Vecteur(Integer.parseInt(argv[0]), Integer.parseInt(argv[1])); System.out.println("v1 : " + v1); System.out.println("Longueur de " + v1 + " : " + v1.longueur()); Vecteur v2 = new Vecteur(Integer.parseInt(argv[2]), Integer.parseInt(argv[3])); System.out.println("v2 : " + v2); if (v1.pluspetitque(v2)) System.out.println("Le " + v1 + " est plus petit que le " + v2); System.out.println("Le " + v1 + " est au moins aussi grand que " + "le " + v2); v1.addition(v2); System.out.println("v1 après addition de v2 : " + v1); Vecteur v3 = Vecteur.addition(v1, v2); System.out.println("v3 = v1 + v2 : " + v3); Solution 7 : class ExceptionPileVide extends Exception{ return "la pile est vide"; Méthode1 public class Pile1{ private int taille = 3; private int increment = 2; private int[] tableau = new int[taille]; private int hauteur; // nombre d'entiers rangés
5 void empiler(int n){ if (hauteur == taille){ taille = taille + increment; int[] tableaubis = new int[taille]; for (int i = 0; i < hauteur; i++) tableaubis[i] = tableau[i]; tableau = tableaubis; tableau[hauteur] = n; hauteur++; int depiler() throws ExceptionPileVide{ int cle; if (estvide()) throw new ExceptionPileVide(); hauteur--; return tableau[hauteur]; boolean estvide(){ return hauteur == 0; Méthode 2 public class Maillon { int donnee; Maillon suivant; Maillon(int donnee, Maillon suivant) { this.donnee = donnee; this.suivant = suivant; public class Pile2{ private Maillon debut; void empiler(int n) { debut = new Maillon(n, debut); int depiler() throws ExceptionPileVide { int cle; if (estvide()) throw new ExceptionPileVide(); cle = debut.donnee; debut = debut.suivant; return cle; boolean estvide() { return debut == null;
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Java I/O Stream 1 Topics What is an I/O stream? Types of Streams Stream class hierarchy Control flow of an I/O operation using Streams Byte streams Character streams Buffered streams Standard I/O streams
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