JAVA模版模式-案例

秒速五厘米 2024-03-27 19:24 74阅读 0赞

## Java模板模式 ##

//首先，定义一个运算的模板(抽象类)
    public abstract class Calculator {
          
        abstract int operation(int a, int b);  
          
        public int calculate(int a, int b){
          
            return a + b;  
        }  
    }
    //然后，创建具体的运算类(子类)
    public class Addition extends Calculator {
          
        @Override  
        int operation(int a, int b){
          
            return a + b;  
        }  
    }  
      
    public class Subtraction extends Calculator {
          
        @Override  
        int operation(int a, int b){
          
            return a - b;  
        }  
    }  
      
    public class Multiplication extends Calculator {
          
        @Override  
        int operation(int a, int b){
          
            return a * b;  
        }  
    }  
      
    public class Division extends Calculator {
          
        @Override  
        int operation(int a, int b){
          
            if(b != 0){
          
                return a / b;  
            }else{
          
                throw new IllegalArgumentException("Divisor cannot be zero");  
            }  
        }  
    }
    //最后，就可以使用这些类进行计算
    public class Main {
          
        public static void main(String[] args) {
          
            Calculator calculator1 = new Addition();   
            Calculator calculator2 = new Subtraction();   
            Calculator calculator3 = new Multiplication();   
            Calculator calculator4 = new Division();   
            System.out.println("10 + 5 = " + calculator1.calculate(10,5));   
            System.out.println("10 - 5 = " + calculator2.calculate(10,5));   
            System.out.println("10 * 5 = " + calculator3.calculate(10,5));   
            System.out.println("10 / 5 = " + calculator4.calculate(10,5));   
        }   
    }