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                # Java 程序:使用方法重載執行算術運算 > 原文: [https://beginnersbook.com/2017/09/java-program-to-perform-arithmetic-operation-using-method-overloading/](https://beginnersbook.com/2017/09/java-program-to-perform-arithmetic-operation-using-method-overloading/) 該程序使用方法重載查找兩個,三個和四個數字的總和。這里我們有三個具有相同名稱`add()`的方法,這意味著我們正在重載此方法。根據我們在調用`add`方法時傳遞的參數數量,將確定將調用哪個方法。 要了解這個程序,你應該具備以下[核心 Java](https://beginnersbook.com/java-tutorial-for-beginners-with-examples/) 主題的知識: [Java 方法重載](https://beginnersbook.com/2013/05/method-overloading/) ## 示例:使用“方法重載”查找多個數字之和的程序 首先,`add()`方法有兩個參數,這意味著當我們在調用`add()`方法時傳遞兩個數字時,將調用此方法。類似地,當我們傳遞三個和四個參數時,將分別調用第二個和第三個`add`方法。 ```java public class JavaExample { int add(int num1, int num2) { return num1+num2; } int add(int num1, int num2, int num3) { return num1+num2+num3; } int add(int num1, int num2, int num3, int num4) { return num1+num2+num3+num4; } public static void main(String[] args) { JavaExample obj = new JavaExample(); //This will call the first add method System.out.println("Sum of two numbers: "+obj.add(10, 20)); //This will call second add method System.out.println("Sum of three numbers: "+obj.add(10, 20, 30)); //This will call third add method System.out.println("Sum of four numbers: "+obj.add(1, 2, 3, 4)); } } ``` 輸出: ```java Sum of two numbers: 30 Sum of three numbers: 60 Sum of four numbers: 10 ```
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