For the question below, use the following class definition. import java.text.Dec
ID: 3779091 • Letter: F
Question
For the question below, use the following class definition. import java.text.DecimalFormat; public class Student { private String name; private String major; private double gpa; private int hours; public Student(String newName, String newMajor, double newGPA, int newHours) { name = newName; major = newMajor; gpa = newGPA; hours = newHours; } public String toString( ) { DecimalFormat df = new DecimalFormat("xxxx"); // xxxx needs to be replaced return name + " " + major + " " + df.format(gpa) + " " + hours } } Which of the following patterns should be used in place of "xxxx" when instantiating df so that the gpa to be output in typical form (like 3.810)? 1. "0.# " 2. "0.0##" 3. "#.0" 4. "0.000" 5. "#.###"
Explanation / Answer
The Correct option is 4. "0.000"
----------------------------------------------------------------------------------------------------
/**
* The Student that sets the name, major,gpa and
* hours.
* */
//Student.java
import java.text.DecimalFormat;
public class Student
{
//declare instance variables
private String name;
private String major;
private double gpa;
private int hours;
//Student constructor
public Student(String newName, String newMajor, double newGPA, int newHours)
{
name = newName;
major = newMajor;
gpa = newGPA;
hours = newHours;
}
public String toString( )
{
/*Note : # represents a digit
0 denots a digit or 0 if number is not a digit
So the correct option is 0.000
So when prited 3.81 as 3.810 , "0.000" is set as argument
for DecimalFormat class.*/
DecimalFormat df = new DecimalFormat("0.000");
return name + " " + major + " " + df.format(gpa) + " " + hours ;
}
}//end of Student
//StudentTester.java
public class StudentTester
{
public static void main(String[] args)
{
//Create an instance of Student class
Student std=new Student("Johnson", "CS",3.810, 60);
//print std object
System.out.println(std);
}//end of main method
}//end of class StudentTester
Sample output:
Johnson
CS
3.810
60
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