1. The teacher asked Zhang Hao to use the object-oriented idea to write a calculator class (Calculator), which can realize the addition, subtraction, multiplication and division of two integers. If you are Zhang Hao, how are you going to make it happen? Write out your thoughts.
package com.homework.demo.test1;
/*
* Calculator class
*/
public class Calculator {
int num1; //first integer
int num2; //second integer
double num3; //floating point number to divide;
public void add() { //Addition method
System.out.print("The sum is: "+(num1+num2));
}
public void subtract() { //Method of subtraction
System.out.print("The difference is: "+(num1-num2));
}
public void multiply() { //Method of multiplying
System.out.print("The product is: "+(num1*num2));
}
public void divider() { //method of division
num3 = (num1*1.0) / (num2*1.0);
System.out.print("The quotient is: "+num3);
}
}
package com.homework.demo.test1;
import java.util.Scanner;
public class Output {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
Calculator calculator = new Calculator(); //Create an object of calculator class to receive
System.out.print("Please enter the first integer you want to operate on: ");
calculator.num1 = input.nextInt();
System.out.print("Please enter the second integer you want to operate on: ");
calculator.num2 = input.nextInt();
System.out.print("Please enter the operator you want to perform: ");
String count = input.next();
switch (count) {
case "+":
calculator.add();
break;
case "-":
calculator.subtract();
break;
case "*":
calculator.multiply();
break;
case "/":
calculator.divider();
break;
}
}
}
2. Assuming that the current time is 10:11:00 on May 12, 2015, write a CurrentTime class, set the property to change the time, and define the show() method to display the changed time.
package com.homework.demo.testFirst2;
public class CurrentTIme {
int year = 2015; //year
int month = 5; //month
int date = 12; //日
int time = 10; //time
int minute =11; //minute
int second = 00; //seconds
public void show() {
System.out.println(year + "年"+month + "月"+ date + "日" + time + "点" + minute + "分 " + second + "秒");
}
}
package com.homework.demo.testFirst2;
public class Output {
public static void main(String[] args) {
// TODO Auto-generated method stub
CurrentTIme curren = new CurrentTIme();
curren.show();
}
}
3. Improve the second question and change the current time to 10:11:30 on May 12, 2015. Write a Demo class, change the time set in the CurrentTime class, and print the output.
package com.homework.demo.testFirst2;
public class CurrentTIme {
int year = 2015; //year
int month = 5; //month
int date = 12; //日
int time = 10; //time
int minute =11; //minute
int second = 00; //seconds
public void show() {
System.out.println(year + "年"+month + "月"+ date + "日" + time + "点" + minute + "分 " + second + "秒");
}
}
package com.homework.demo.testFirst2;
public class Dome {
public static void main(String[] args) {
// TODO Auto-generated method stub
CurrentTIme curren = new CurrentTIme(); //Create object
curren.second = 30;
curren.show();
}
}
4. Describe computers using classes.
package com.homework.demo.testFirst3;
public class Computer {
String cpu = "Intel Core [email protected] Quad Core"; //Processor
String mainBoard = "Vulcan Series"; //主板
String disPlay = "Sharp SHP142A LQ156D1JX01B"; //Display
String hardDisk = "Western Digital WDC WDS240G1G0B-00RC30(240G/SSD)"; //hard disk
String internalStorage = "ADATA DDR4 2133MHz (8G)"; //Memory
String disPlayCard = "Nvidia GeForce GTX 1050 Ti(4G)"; //graphics card
public void show() {
System.out.println("Processor:"+cpu+"\nMotherboard:"+mainBoard+"\nHard Disk:"+hardDisk+"\nMemory:"+internalStorage+"\nGraphics Card:"+disPlayCard);
}
}
package com.homework.demo.testFirst3;
import com.sun.org.apache.xerces.internal.impl.xs.opti.SchemaDOM;
public class Output {
public static void main(String[] args) {
// TODO Auto-generated method stub
Computer computer = new Computer();
computer.show();
}
}
5. If a company wants to develop a new game, please use object-oriented thinking to design heroes, monsters and weapons. Write test classes, create hero objects, monster objects, and weapon objects, and output their respective information. The settings are as follows.
1. Hero class.
Attributes: hero name, health
Method: output basic information
2. Monster class:
Attributes: monster name, health, type
Method: output basic information
3. Weapons:
Attributes: weapon name, attack power
Method: output basic information
package com.homework.demo.testFirst4;
public class Hero {
String name; // hero name
int health; // hero's health
public void show() { //Method for outputting hero information
System.out.println("Name: " + name + ", Health: " + health);
}
}
package com.homework.demo.testFirst4;
public class Monster {
String name; //Monster name
int health; //Monster health
String type; //monster type
public void show() { //Method for outputting monster information
System.out.println("Name: "+name+", Health: "+health+", Type: "+type);
}
}
package com.homework.demo.testFirst4;
public class Weapon {
String name; // weapon name
int atk; //weapon attack power
public void show() { //Method for outputting weapon information
System.out.println("Weapon name: "+name+", Attack power: "+atk);
}
}
package com.homework.demo.testFirst4;
public class Output {
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("I am a hero, my basic information is as follows: ");
Hero hero = new Hero(); //Create an object of the hero class
hero.name = "Li Xiaoxia";
hero.health = 300;
hero.show();
System.out.println("I am a weapon, my basic information is as follows:");
Weapon weapon = new Weapon(); //Create weapon class object
weapon.name = "Reaper Scythe";
weapon.atk = 12;
weapon.show();
System.out.println("I am a monster, my basic information is as follows:");
Monster monster = new Monster();//Create a monster class object
monster.name = "Little Turtle";
monster.health = 300;
monster.type = "Dive type";
monster.show();
}
}