Q1) Find the issues in the following Java code, then correct them.

public class Rectangular

{

private int length;

private int width;

public Rectangular(int length, int width)

{

this.length = length;

this.width = width;

}

public String area ()

{

return length * width;

}

}

public class RectangularTest

{

public static void main (String[] args)

{

Rectangular r1 = new Rectangular(3,5);

System.out.println(area());

}

} Q2)

• Create a Java class for Student with the following requirements:
• Create a tester class with the main method with the following requirements.
• Each student has two attributes: Name and ID.
• Create two constructors. One constructor without parameters to initialize all the instance variables to default values, and another constructor to initialize all the attributes to specific values.
• Add all setter and getter methods.
• Create two objects from Student class. Create the first object using the default constructor and the second object must set your name and ID.
• Print your name and ID using getter methods.
•  
• Q3)Suppose you have the following 2 dimensions array:int arr[][] = {{ 10, 11, 12, 13, 14 },{15, 16, 17, 18, 19 },{20, 21, 22, 23, 24 },{25, 26, 27, 28, 29 },{30, 31, 32, 33, 34 }};With the the following rows and columns sizes:static int rows= 5;static int columns= 5;Write a Java programs that uses takesarr[][] and reverse(mirror) all rows. For example, the first row should be as the following afteryou reverse it 14 13 12 11 10. A screenshotof your output should also be included in your answer and should display boththe original array and the reversed array.Sample output:
•  
• Q4) Whatis the output of the following Java program?public class Exam{static int studyingHours = 31;private String course = OOP;public void compute(int studyingHours){Exame = new Exam();this.studyingHours= 24;course= Math;System.out.println(“Exam.studyingHours:” + Exam.studyingHours);System.out.println(“e.studyingHours:” + e.studyingHours);System.out.println(“e.course:” + e.course);System.out.println(“course:” + course);}public static void main(String args[]){Exame = new Exam();e.compute(31);}}