public class Person { private String name; private int age; public Person() { na
ID: 3931601 • Letter: P
Question
public class Person
{
private String name;
private int age;
public Person()
{
name="";
age=0;
}
/**
Create a person with a given name and age.
@param name the name
@param age the age
*/
public Person(String name, int age)
{
this.name = name;
this.age = age;
}
/**
Get the name.
@return the name
*/
public String getName()
{
return name;
}
/**
Change the name.
@param name the name
*/
public void setName(String name)
{
this.name = name;
}
/**
Get the age.
@return the age
*/
public int getAge()
{
return age;
}
/**
Change the age.
@param age the age
*/
public void setAge()
{
this.age = age;
}
/**
Convert person to string form.
*/
public String toString()
{
return "Name: " + name + " " + "Age: " + age;
}
}
OUTPUT should look like this!
Explanation / Answer
solution
package com.prt.test;
public class Person
{
protected String name;
protected int age;
public Person()
{
name="";
age=0;
}
/**
Create a person with a given name and age.
@param name the name
@param age the age
*/
public Person(String name, int age)
{
this.name = name;
this.age = age;
}
/**
Get the name.
@return the name
*/
public String getName()
{
return name;
}
/**
Change the name.
@param name the name
*/
public void setName(String name)
{
this.name = name;
}
/**
Get the age.
@return the age
*/
public int getAge()
{
return age;
}
/**
Change the age.
@param age the age
*/
public void setAge()
{
this.age = age;
}
/**
Convert person to string form.
*/
public String toString()
{
return "Name: " + name + " " + "Age: " + age;
}
}
package com.prt.test;
public class Student extends Person implements Comparable<Student>{
private int studentId;
private String major;
/**
* @return the studentId
*/
public int getStudentId() {
return studentId;
}
/**
* @param studentId the studentId to set
*/
public void setStudentId(int studentId) {
this.studentId = studentId;
}
/**
* @return the major
*/
public String getMajor() {
return major;
}
/**
* @param major the major to set
*/
public void setMajor(String major) {
this.major = major;
}
public Student(String name, int age, int studentId, String major) {
super(name, age);
this.studentId = studentId;
this.major = major;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "name:" + name+ " "+" "+"age:"+ age+" "+ "studentId :"+ studentId + " " +" major:"+ major;
}
public int compareTo(Student st){
if(studentId==st.studentId)
return 0;
else if(studentId>st.studentId)
return 1;
else
return -1;
}
}
package com.prt.test;
public class Instructor extends Person implements Comparable<Instructor> {
private double salary;
public Instructor(String name, int age, double salary) {
super(name, age);
this.salary = salary;
}
/**
* @return the salary
*/
public double getSalary() {
return salary;
}
/**
* @param salary
* the salary to set
*/
public void setSalary(double salary) {
this.salary = salary;
}
public int compareTo(Instructor is) {
if (salary == is.salary)
return 0;
else if (salary > is.salary)
return 1;
else
return -1;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "name:" + name + " " + "age:" + age + " " + "salary=" + salary;
}
}
package com.prt.test;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class FileUtil {
static List<Student> list = null;
public static List<Student> read(File file) throws IOException {
BufferedReader br = new BufferedReader(new FileReader(file));
list = new ArrayList<Student>();
String line = null;
int count = 0;
while ((line = br.readLine()) != null) {
++count;
if (count == 1) {
continue;
}
String[] words = line.split("\s+");
// System.out.println(words.length);
// int num = Integer.parseInt(words[0]);
String name = words[0];
int age = Integer.parseInt(words[1]);
int studentId = Integer.parseInt(words[2]);
String major = words[3];
Student student = new Student(name, age, studentId, major);
list.add(student);
}
// System.out.println(count);
return list;
}
}
package com.prt.test;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class FileUtil1 {
static List<Instructor> list = null;
public static List<Instructor> read(File file) throws IOException {
BufferedReader br = new BufferedReader(new FileReader(file));
list = new ArrayList<Instructor>();
String line = null;
int count = 0;
while ((line = br.readLine()) != null) {
++count;
if (count == 1) {
continue;
}
String[] words = line.split("\s+");
String name = words[0];
int age = Integer.parseInt(words[1]);
double salary = Double.parseDouble(words[2]);
Instructor instructor = new Instructor(name, age, salary);
list.add(instructor);
}
return list;
}
}
package com.prt.test;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class Test1 {
static File file = new File("D:\data1.txt");
static File file1 = new File("D:\data2.txt");
public static void main(String[] args) throws IOException {
List<Student> list = FileUtil.read(file);
List<Instructor> list1 = FileUtil1.read(file1);
Collections.sort(list);
Collections.sort(list1);
System.out.println("the list of students sorted by studentid");
for (Student student : list) {
System.out.println(student);
}
System.out.println("===============================================");
System.out.println("the list of instructors sorted by their salaries:");
for (Instructor instructor : list1) {
System.out.println(instructor);
}
}
}
output
the list of students sorted by studentid
name:Eric age:19 studentId :11111 major:Engineering
name:Larry age:20 studentId :12345 major:CPSC
name:John age:17 studentId :23434 major:CPSE
name:Jennifer age:20 studentId :33333 major:Biology
name:Amy age:23 studentId :34343 major:IT
name:Christina age:19 studentId :55555 major:French
name:Mike age:21 studentId :77777 major:Chemistry
name:Ashley age:18 studentId :99923 major:ENGL
===============================================
the list of instructors sorted by their salaries
name:Jenny age:29 salary=35343.0
name:Kathy age:45 salary=39888.43
name:Chris age:35 salary=46233.0
name:Alex age:42 salary=55599.21
name:steve age:50 salary=98000.5
name:Shala age:55 salary=1500010.23
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