(a) Name one String method which results in positive integer only.

(b) Name one String method which results in a character.

John was asked to write a Java code to calculate the surface area of a cone. The following code was written by him: Surface area of cone is A = πrl

l = $\sqrt{r^2 + h^2}$

class area{
    double area(double r, double h){
        double l, a;
        a = 22.0 / 7 * r * l;
        l = Math.sqrt(r * r + h * h);
        return a;
    }
}

Specify the type of the error in the above program, correct and write the program to be error free.

(a) Write the Java statement to initialize the first 6 odd numbers in a 3 × 2 array.

(b) What is the result of x[0][1] + x[2][1] of the above array?

Give the output of the following program segment and specify how many times the loop is executed.

String s = "JAVA";
for(i = 0; i < s.length(); i += 2)
    System.out.println(s.substring(i));