Exception in thread “main” java.lang.ArrayIndexOutOfBoundsException: 0 error in Java

Question

When i tried running this code I get this error..I dont know where i went wrong..

Exception in thread \"main\" java.lang.ArrayIndexOutOfBoundsException: 0
           


        

Answer 1

package coordCart;

public class LignePol { private Point[] sommets;

public LignePol(int n) {
    Point[] sommets = new Point[n];
}
public LignePol(Point[] sommets) {
    this.sommets = sommets; 
}

public Point getSommet(int i) {
    return sommets[i];
}
public void setSommet(int i, Point p) {
    sommets[i] = p;
}

public String toString() {
    if (sommets.length == 0)
        return "[ ]";

    String res = "[ " + sommets[0];
    for (int i = 1; i < sommets.length; i++)
        res += ", " + sommets[i];
    return res + " ]";
}

public Object clone() {
    Point[] bis = new Point[sommets.length]; 
    for (int i = 0; i < sommets.length; i++) {
        Point p = sommets[i];
        bis[i] = new Point(p.x(), p.y());
    }   
    return new LignePol(bis);
}

public void homothetie(double k) {
    for (int i = 0; i < sommets.length; i++)
        sommets[i].homothetie(k);
}
public void translation(double dx, double dy) {
    for (int i = 0; i < sommets.length; i++)
        sommets[i].translation(dx, dy);
}
public void rotation(double a) {    
    for (int i = 0; i < sommets.length; i++)
        sommets[i].rotation(a);
}

void tracer() {
    for (int i = 1; i < sommets.length; i++)
        tracerSegment((int) sommets[i - 1].x(), (int) sommets[i - 1].y(), 
                (int) sommets[i].x(), (int) sommets[i].y());
}

public static void main(String[] args) {
    Point[] t = { 
            new Point( 1, 3), new Point( 0, 2), new Point( 0, 0),
            new Point( 3, 5), new Point( 4, 4), new Point( 0, 4),
            new Point( 4, 2), new Point( 4, 0), new Point( 1, 1) };
    LignePol lp = new LignePol(t);

    double m = Double.parseDouble(args[0]); 
    double n = Double.parseDouble(args[1]); 
    double l = Double.parseDouble(args[1]); 

    lp.homothetie(l / 4.0);
    lp.translation(m, n);

    lp.tracer();
}

// pour la simulation
static void tracerSegment(int x0, int y0, int x1, int y1) {
    System.out.println("(" + x0 + "," + y0 + ") --> (" + x1 + "," + y1 + ")");
}

}

Answer 2

This exception means:

Exception in thread "main" // in main method
java.lang.ArrayIndexOutOfBoundsException: 0 at // Exception ArrayIndexOutOfBounds

Thrown to indicate that an array has been accessed with an illegal index. The index is either negative or greater than or equal to the size of the array.

numericalComputatio.fibo.main(fibo.java:30) // in line 30, in class fibo