Consider the following line of code for calling a method named methodX where d a

Question

Consider the following line of code for calling a method named methodX where data is an integer and varData is an double variable.

   methodX (data, varData );

Which one of the following method headers is valid for methodX?

public static void methodX ( int varData, double data)

The non-static methods of a class are called the ____ methods of the class.

permanent

Which of the following is an example of a local identifier in the following code?

01: public class scopeRule
02: {
03: static double intRate = 0.055;
04:      static String name;
05:      static int t;

06:    public static int main(String[] args)
07:      {
08:          int first;
09:          double u, t;
10: String str;
11: //. . .
12:      }

13:    public static int first(int x, int y)
14: {
15:          int t;
16: }

17:    public static double salary;
18: }

Which of the following identifiers in the following code are usable in method first?

01: public class scopeRule
02: {
03: private double intRate = 0.055;
04: private static String name;
05: private int t;

06:    public static int main(String[] args)
07:      {
08:          int first;
09:          double u, t;
10: String str;
11: //. . .
12:      }

13:    public static int first(int x, int y)
14: {
15:          int t;
16: }

17: public double salary;
18: }

name (Line 4)

Which of the following identifiers in the following code are usable in another class?

01: public class scopeRule
02: {
03: private double intRate = 0.055;
04: private static String name;
05: private int t;

06:    public static int main(String[] args)
07:      {
08:          int first;
09:          double u, t;
10: String str;
11: //. . .
12:      }

13:    public static int first(int x, int y)
14: {
15:          int t;
16: }

17: public double salary;
18: }

intRate (Line 3)

In the method first, the programmer wishes to update the value stored in the variable intRate (Line 3). Which of the following is correct?

01: public class scopeRule
02: {
03: private double intRate = 0.055;
04: private String name;
05: private static int t;

06:    public static int main(String[] args)
07:      {
08:          int first;
09:          double u, t;
10: String str;
11: //. . .
12:      }

13:    public static int first(int x, int y)
14: {
15: double intRate;
16: intRate = x * y;
17: }

18: public double salary;
19: }

Consider the following class definition.

public class Cylinder extends Object {
   private double height;

   public Cylinder (double radius, double h) {
super(radius);
       height = h;
   }

public double getRadius() {
return super.getRadius();
}

   public String toString() {
       return (getRadius() + " " + height);
   }

   public double surfaceArea() {
return 2 * 3.14 * getRadius() * height;
   }

   public double volume() {
       return 3.14 * getRadius() * getRadius() * height;
}
}

Suppose that you have the following declaration.

Cylinder cyl = new Cylinder(1.5, 10);

Which of the following statements are valid in Java?

Explanation / Answer

Question 1
Answer:
public static void methodX ( int varData, double data)

Question 2
Answer:
instance

Question 3
Answer:
int t;

Question 4
Answer:
name (Line 4)

Question 5
Answer:
salary (Line 17)

Question 6
Answer:
Write another non-static method to do so.

Question 7
Answer:
cyl.volume();
cyl.surfaceArea();

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