Java 基本運算子的使用

Java 的算術運算子：+ - * / %

public class Person{

 public int ageYears = 32;
 
 public void calculateAge(){
 
  int ageDays = ageYears * 365;
  long ageSeconds = ageYears * 365 * 24L * 60 * 60;
 
  System.out.println("You are " + ageDays + " days old.");
  System.out.println("You are " + ageSeconds + " seconds old.");
 }
}

執行它：

public class PersonDemo{

 public static void main(String[] args){
 
  Person peter = new Person();
  peter.calculateAge();
 
 }
}

配合 java.util.Scanner 物件來做為輸入數量的參考：

import java.util.Scanner;

public class Demo{

 public static void main(String[] args){
 
  Shirt myShirt = new Shirt();
  myShirt.shirtID = 100;
  myShirt.colorCode = 'B';
  myShirt.price = 45.12;
  myShirt.description = "45周年紀念衫";
  
  myShirt.displayInformation();
 
  Scanner scanner = new Scanner(System.in);
  System.out.print("請輸入購買件數：");
  int input = scanner.nextInt();
  System.out.println("總價：" + input*myShirt.price);
 
 }
}