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Lab 4

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黑墨水鱼
2022-03-17 18:18:06 +08:00
parent 52c53c5be7
commit 6bf672bd5b
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5
lab/lab4/Question1/Start.java Normal file
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public class Start {
public static void main(String[] args) {
Student.testStudent();
}
}

82
lab/lab4/Question1/Student.java Normal file
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/*
* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
* Date: 2022-03-10
* Description: Student class
*/
public class Student {
/*
* Student's ID number
*/
private int ID;
/*
* whether the student is currently sleeping or not, default is false
*/
private boolean sleeping;
/**
* Constructor. Initialize the ID number and sleeping status as false.
*
* @param ID, the ID number of the student
*/
public Student(int ID) {
this.ID = ID;
this.sleeping = false;
}
/**
* Getter of the ID number.
*
* @return the ID number of the student
*/
public int getID() {
return this.ID;
}
/**
* Identify whether the student is sleeping or not.
*
* @return true if the student is sleeping, false otherwise
*/
public boolean isSleeping() {
return this.sleeping;
}
/**
* Make the student fall in sleep.
*
* @return void
*/
public void fallAsleep() {
this.sleeping = true;
}
/**
* Walkup the student.
*
* @return void
*/
public void wakeUp() {
this.sleeping = false;
}
/**
* Test student class.
*/
public static void testStudent() {
Student s = new Student(1234567890);
System.out.println(s.getID() == 1234567890);
System.out.println(s.isSleeping() == false);
s.fallAsleep();
System.out.println(s.isSleeping() == true);
s.fallAsleep();
System.out.println(s.isSleeping() == true);
s.wakeUp();
System.out.println(s.isSleeping() == false);
s.wakeUp();
System.out.println(s.isSleeping() == false);
}
}

30
lab/lab4/Question2/Start.java Normal file
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/*
* Explain:
* The check method is static because it is do not need to create an Start object.
*/
public class Start {
public static void main(String[] args) {
Student.testStudent();
Student stu = new Student(123);
System.out.println(check(stu) == "need coffee");
stu.fallAsleep();
System.out.println(check(stu) == "sweet dreams");
}
/**
* check student sleeping. If student is sleeping, return "sweet dreams", if
* not, return "need coffee".
*
* @param stu. Student object
* @return String.
*/
public static String check(Student stu) {
if (stu.isSleeping()) {
return "sweet dreams";
} else {
return "need coffee";
}
}
}

82
lab/lab4/Question2/Student.java Normal file
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/*
* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
* Date: 2022-03-10
* Description: Student class
*/
public class Student {
/*
* Student's ID number
*/
private int ID;
/*
* whether the student is currently sleeping or not, default is false
*/
private boolean sleeping;
/**
* Constructor. Initialize the ID number and sleeping status as false.
*
* @param ID, the ID number of the student
*/
public Student(int ID) {
this.ID = ID;
this.sleeping = false;
}
/**
* Getter of the ID number.
*
* @return the ID number of the student
*/
public int getID() {
return this.ID;
}
/**
* Identify whether the student is sleeping or not.
*
* @return true if the student is sleeping, false otherwise
*/
public boolean isSleeping() {
return this.sleeping;
}
/**
* Make the student fall in sleep.
*
* @return void
*/
public void fallAsleep() {
this.sleeping = true;
}
/**
* Walkup the student.
*
* @return void
*/
public void wakeUp() {
this.sleeping = false;
}
/**
* Test student class.
*/
public static void testStudent() {
Student s = new Student(1234567890);
System.out.println(s.getID() == 1234567890);
System.out.println(s.isSleeping() == false);
s.fallAsleep();
System.out.println(s.isSleeping() == true);
s.fallAsleep();
System.out.println(s.isSleeping() == true);
s.wakeUp();
System.out.println(s.isSleeping() == false);
s.wakeUp();
System.out.println(s.isSleeping() == false);
}
}

92
lab/lab4/Question3/Chicken.java Normal file
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/*
* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
* Date: 2022-03-17
* Description: This is the Chicken class.
*/
public class Chicken {
/*
* The weight instance variable indicates the current weight of the chiken.
*/
private double weight;
/*
* The sleeping instance variable indicates whether the chicken is currently
* sleeping or not.
* It is intially sleeping.
*/
private boolean sleeping;
/**
* Constructor: Chicken(double weight)
*
* @param weight
* The weight of the chicken.
* The weight must be greater than 0. If the weight is less than
* 0, the weight is set to 0.
*/
public Chicken(double weight) {
if (weight < 0) {
this.weight = 0;
} else {
this.weight = weight;
}
// initially the chicken is sleeping
this.sleeping = true;
}
/**
* Getter method: getWeight()
*
* @return The weight of the chicken.
*/
public double getWeight() {
return this.weight;
}
/**
* Getter method: isSleeping()
*
* @return true if the chicken is sleeping, false otherwise.
*/
public boolean isSleeping() {
return this.sleeping;
}
/**
* Makes the chicken fall asleep. Or do nothing if the chicken is already
* sleeping.
*
* @return void
*/
public void fallAsleep() {
this.sleeping = true;
}
/**
* Makes the chicken wake up. Or do nothing if the chicken is already awake.
*
* @return void
*/
public void wakeUp() {
this.sleeping = false;
}
/**
* Tests function.
*/
public static void testChicken() {
Chicken c = new Chicken(2.3);
System.out.println(c.getWeight() == 2.3);
System.out.println(c.isSleeping() == true);
c.wakeUp();
System.out.println(c.isSleeping() == false);
c.wakeUp(); // should do nothing because the chicken is already awake
System.out.println(c.isSleeping() == false);
c.fallAsleep();
System.out.println(c.isSleeping() == true);
c.fallAsleep(); // should do nothing because the chicken is already sleeping
System.out.println(c.isSleeping() == true);
}
}

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lab/lab4/Question3/Start.java Normal file
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/*
* Explain:
* The check method is static because it is do not need to create an Start object.
*/
public class Start {
public static void main(String[] args) {
Student.testStudent();
Student stu = new Student(123);
System.out.println(check(stu) == "need coffee");
stu.fallAsleep();
System.out.println(check(stu) == "sweet dreams");
Chicken.testChicken();
}
/**
* check student sleeping. If student is sleeping, return "sweet dreams", if
* not, return "need coffee".
*
* @param stu. Student object
* @return String.
*/
public static String check(Student stu) {
if (stu.isSleeping()) {
return "sweet dreams";
} else {
return "need coffee";
}
}
}

82
lab/lab4/Question3/Student.java Normal file
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/*
* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
* Date: 2022-03-10
* Description: Student class
*/
public class Student {
/*
* Student's ID number
*/
private int ID;
/*
* whether the student is currently sleeping or not, default is false
*/
private boolean sleeping;
/**
* Constructor. Initialize the ID number and sleeping status as false.
*
* @param ID, the ID number of the student
*/
public Student(int ID) {
this.ID = ID;
this.sleeping = false;
}
/**
* Getter of the ID number.
*
* @return the ID number of the student
*/
public int getID() {
return this.ID;
}
/**
* Identify whether the student is sleeping or not.
*
* @return true if the student is sleeping, false otherwise
*/
public boolean isSleeping() {
return this.sleeping;
}
/**
* Make the student fall in sleep.
*
* @return void
*/
public void fallAsleep() {
this.sleeping = true;
}
/**
* Walkup the student.
*
* @return void
*/
public void wakeUp() {
this.sleeping = false;
}
/**
* Test student class.
*/
public static void testStudent() {
Student s = new Student(1234567890);
System.out.println(s.getID() == 1234567890);
System.out.println(s.isSleeping() == false);
s.fallAsleep();
System.out.println(s.isSleeping() == true);
s.fallAsleep();
System.out.println(s.isSleeping() == true);
s.wakeUp();
System.out.println(s.isSleeping() == false);
s.wakeUp();
System.out.println(s.isSleeping() == false);
}
}

92
lab/lab4/Question4/Chicken.java Normal file
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/*
* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
* Date: 2022-03-17
* Description: This is the Chicken class.
*/
public class Chicken {
/*
* The weight instance variable indicates the current weight of the chiken.
*/
private double weight;
/*
* The sleeping instance variable indicates whether the chicken is currently
* sleeping or not.
* It is intially sleeping.
*/
private boolean sleeping;
/**
* Constructor: Chicken(double weight)
*
* @param weight
* The weight of the chicken.
* The weight must be greater than 0. If the weight is less than
* 0, the weight is set to 0.
*/
public Chicken(double weight) {
if (weight < 0) {
this.weight = 0;
} else {
this.weight = weight;
}
// initially the chicken is sleeping
this.sleeping = true;
}
/**
* Getter method: getWeight()
*
* @return The weight of the chicken.
*/
public double getWeight() {
return this.weight;
}
/**
* Getter method: isSleeping()
*
* @return true if the chicken is sleeping, false otherwise.
*/
public boolean isSleeping() {
return this.sleeping;
}
/**
* Makes the chicken fall asleep. Or do nothing if the chicken is already
* sleeping.
*
* @return void
*/
public void fallAsleep() {
this.sleeping = true;
}
/**
* Makes the chicken wake up. Or do nothing if the chicken is already awake.
*
* @return void
*/
public void wakeUp() {
this.sleeping = false;
}
/**
* Tests function.
*/
public static void testChicken() {
Chicken c = new Chicken(2.3);
System.out.println(c.getWeight() == 2.3);
System.out.println(c.isSleeping() == true);
c.wakeUp();
System.out.println(c.isSleeping() == false);
c.wakeUp(); // should do nothing because the chicken is already awake
System.out.println(c.isSleeping() == false);
c.fallAsleep();
System.out.println(c.isSleeping() == true);
c.fallAsleep(); // should do nothing because the chicken is already sleeping
System.out.println(c.isSleeping() == true);
}
}

52
lab/lab4/Question4/Start.java Normal file
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/*
* Explain:
* The check method is static because it is do not need to create an Start object.
*/
public class Start {
public static void main(String[] args) {
Student.testStudent();
Student stu = new Student(123);
System.out.println(check(stu) == "need coffee");
stu.fallAsleep();
System.out.println(check(stu) == "sweet dreams");
Chicken.testChicken();
Chicken chick = new Chicken(123);
System.out.println(check(chick) == "sweet dreams");
chick.wakeUp();
System.out.println(check(chick) == "need coffee");
}
/**
* check student sleeping. If student is sleeping, return "sweet dreams", if
* not, return "need coffee".
*
* @param stu. Student object
* @return String.
*/
public static String check(Student stu) {
if (stu.isSleeping()) {
return "sweet dreams";
} else {
return "need coffee";
}
}
/**
* check chicken sleeping. If chicken is sleeping, return "sweet dreams", if
* not, return "need coffee".
*
* @param chk. Chicken object
* @return String.
*/
public static String check(Chicken chk) {
if (chk.isSleeping()) {
return "sweet dreams";
} else {
return "need coffee";
}
}
}

82
lab/lab4/Question4/Student.java Normal file
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/*
* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
* Date: 2022-03-10
* Description: Student class
*/
public class Student {
/*
* Student's ID number
*/
private int ID;
/*
* whether the student is currently sleeping or not, default is false
*/
private boolean sleeping;
/**
* Constructor. Initialize the ID number and sleeping status as false.
*
* @param ID, the ID number of the student
*/
public Student(int ID) {
this.ID = ID;
this.sleeping = false;
}
/**
* Getter of the ID number.
*
* @return the ID number of the student
*/
public int getID() {
return this.ID;
}
/**
* Identify whether the student is sleeping or not.
*
* @return true if the student is sleeping, false otherwise
*/
public boolean isSleeping() {
return this.sleeping;
}
/**
* Make the student fall in sleep.
*
* @return void
*/
public void fallAsleep() {
this.sleeping = true;
}
/**
* Walkup the student.
*
* @return void
*/
public void wakeUp() {
this.sleeping = false;
}
/**
* Test student class.
*/
public static void testStudent() {
Student s = new Student(1234567890);
System.out.println(s.getID() == 1234567890);
System.out.println(s.isSleeping() == false);
s.fallAsleep();
System.out.println(s.isSleeping() == true);
s.fallAsleep();
System.out.println(s.isSleeping() == true);
s.wakeUp();
System.out.println(s.isSleeping() == false);
s.wakeUp();
System.out.println(s.isSleeping() == false);
}
}