Question

I spotted a couple of errors, but I am still not getting this code to work. Can someone help?

public class Bounds1{

int [][] a1;

public Bounds1(){

/*
* Create array Dimension 1
*/
a1 = new int[(int)(Math.random() * 10) + 1][];

for(int i = 0; i < a1.length; ++i){

/*
* Create array Dimensions 2
*/
a1[i] = new int[(int)(Math.random() * 20) + 1];
}
}

public static void main(String[] args){

Bounds1 m = new Bounds1();

for(int i = 0; i < m.a1.length; i++){

for(int j = 0; j < m.a1[i].length; j++){

System.out.print(m.a1[i][j] + " ");
}
System.out.println();
}

try{

/* <= is the error */
for(int i = 0; i <= m.a1.length; i++){
/* <= is the error */
for(int j = 0; j <= m.a1[i].length; j++){

System.out.print(m.a1[i][j] + " ");
}
System.out.println();
}
}
/*
* The best approach
*/
catch(ArrayIndexOutOfBoundsException e){

System.out.println(e);
}
/*
* The following is not the best, but will work
catch(Exception e)
   */
   {

System.out.println(e);
}
}
}

Answer 1

// Take "catch(Exception e)" out of the comment
public class Bounds1{
    int [][] a1;
    public Bounds1(){
        /*
         * Create array Dimension 1
         */
        a1 = new int[(int)(Math.random() * 10) + 1][];
        for(int i = 0; i < a1.length; ++i){
            /*
             * Create array Dimensions 2
             */
            a1[i] = new int[(int)(Math.random() * 20) + 1];
        }
    }

    public static void main(String[] args){
        Bounds1 m = new Bounds1();
        for(int i = 0; i < m.a1.length; i++){
            for(int j = 0; j < m.a1[i].length; j++){
                System.out.print(m.a1[i][j] + " ");
            }
            System.out.println();
        }
        try{
            /* <= is the error */
            for(int i = 0; i <= m.a1.length; i++){
                /* <= is the error */
                for(int j = 0; j <= m.a1[i].length; j++){
                    System.out.print(m.a1[i][j] + " ");
                }
                System.out.println();
            }
        }
        /*
         * The best approach
         */
        catch(ArrayIndexOutOfBoundsException e){

            System.out.println(e);
        }
        /*
        * The following is not the best, but will work
        */
        catch(Exception e)
        {

            System.out.println(e);
        }
    }
}