Examen JAVA 2018

// ex2

public class Tab {
    public static void main(String args[]) {
        int arra_nums[] = {-4, 8,-4,-4,-4,-4, 6, -5, 6, -2, 1, 2, 3, -11};
        System.out.println("tab ori: "+Arrays.toString(arra_nums));

        for( int i = 0, j=arra_nums.length-1 ; i<j ; )
        {
            if( arra_nums[i] < 0 && arra_nums[j] > 0 ){
                int temp = arra_nums[j];
                arra_nums[j] = arra_nums[i];
                arra_nums[i] = temp;
            }

            if( arra_nums[i] > 0 )
                i++;

            if( arra_nums[j] < 0 )
                j--;
        }

        System.out.println("tab: "+Arrays.toString(arra_nums));
    }
}

// ex3
faux // f u
true
true
true
false
true
false
true

// ex4
nbr erreurs = 7
sans erreurs :
public class Carre {
    public static void main(String args[]) {
        int tab[] = new int[8];
        String chaine;

        for( int i=0 ; i<tab.length ; i++ )
            System.out.println("tab["+i+"] : "+tab[i]);
        chaine = args[0];
        if ( chaine.equals("fleur") )
            System.out.print("La chaine de longueur " + chaine.length() + " est fleurie");
        else
            System.out.print("La chaine n'est pas fleurie");
    }
}

// ex5
public class Anomalie extends Exception {
    int choix;
    Anomalie(int x){
        choix = x;
    }
    public String toString()
    {
        String str = new String();
        switch(choix) {
            case 0 :
                str = "index > taille";
                break;
            case 1 :
                str = "i > j";
                break;
            case 2 :
                str = "index negative";
                break;
        }
        return str;
    }
}

public class Ex5 {
    public static String extraire(String ch, int i, int j) {
        try {
            if( i < 0 || j < 0 )
                throw new Anomalie(2);
            if( i > j )
                throw new Anomalie(1);
            if( j >= ch.length() )
                throw new Anomalie(0);

        } catch ( Anomalie e ) {
            e.printStackTrace();
            System.exit(-1);
        }

        return ch.substring(i, j+1);
    }

    public static void main(String[] args) {
        String str = "abcdef";
        String e = extraire(str, 1, 3);
        System.out.print(e);
    }

}