Using this student class

public class Student {

//Instance variables

//Each student object has a name and three test scores

private String name; //Student name

private int test1; //Score on test 1

private int test2; //Score on test 2

private int test3; //Score on test 3

// Default constructor -- initialize name to the empty string and

// the test scores to zero.

public Student(){

name = "";

test1 = 0;

test2 = 0;

test3 = 0;

}

// Additional constructor -- initialize the name and test scores

// to the values provided.

public Student(String nm, int t1, int t2, int t3){

name = nm;

test1 = t1;

test2 = t2;

test3 = t3;

}

// Additional constructor -- initialize the name and test scores

// to match those in the parameter s.

public Student(Student s){

name = s.name;

test1 = s.test1;

test2 = s.test2;

test3 = s.test3;

}

//Other methods

public void setName (String nm){

//Set a student's name

name = nm;

}

public String getName (){

//Get a student's name

return name;

}

public void setScore (int i, int score){

//Set test i to score

if (i == 1) test1 = score;

else if (i == 2) test2 = score;

else test3 = score;

}

public int getScore (int i){

//Retrieve score i

if (i == 1) return test1;

else if (i == 2) return test2;

else return test3;

}

public int getAverage(){

//Compute and return the average

int average;

average = (int) Math.round((test1 + test2 + test3) / 3.0);

return average;

}

public int getHighScore(){

//Determine and return the highest score

int highScore;

highScore = test1;

if (test2 > highScore) highScore = test2;

if (test3 > highScore) highScore = test3;

return highScore;

}

public String toString(){

//Construct and return a string representation of the student

String str;

str = "Name: " + name + " " + // " " denotes a newline

"Test 1: " + test1 + " " +

"Test 2: " + test2 + " " +

"Test 3: " + test3 + " " +

"Average: " + getAverage();

return str;

}

}

in java

A Student object should validate its own data. The client runs this method, called validateData(), with a Student object, as follows: String result - student.validateData(); if (result = null) else System.out.println(result); If the student's data are valid, the method returns the value null; otherwise, the method returns a string representing an error message that describes the error in the data. The client can then examine this result and take the appropriate action. A student's name is invalid if it is an empty string. A student's test score is invalid if it lies out- side the range from 0 to 100. Thus, sample error messages might be "SORRY: name required" I and "SORRY: must have 0