Java 程式從另一個呼叫一個建構函式


在本文中,我們將瞭解如何從另一個呼叫一個建構函式。關鍵字“this()”用於呼叫一個建構函式。

以下是相同的演示。我們將使用 this() 顯示兩個數字的和與乘積 −

輸入

假設我們的輸入是 −

The numbers are defined as 12 and 30

輸出

所需的輸出將是 −

The sum is: 42
The product is: 360

演算法

Step 1 - START
Step 2 - Declare an integer value namely my_sum
Step 3 - In the main class, we define a ‘this’ reference to the numbers which would be used as input.
Step 4 - This will call the ‘this’ constructor that invokes the current class constructor.
Step 5 - Another ‘display’ function is used to display the sum.
Step 6 - An object of the class is created, and the functions are invoked to display the result

示例 1

在此處正在計算兩個數字的和。

public class Main {
   int my_sum;
   Main() {
      this(12, 30);
   }
   Main(int my_input_1, int my_input_2) {
      System.out.println("The numbers are defined as " +my_input_1 +" and " +my_input_2);
      this.my_sum = my_input_1 + my_input_2;
   }
   void display() {
      System.out.println("The sum is: " + my_sum);
   }
   public static void main(String[] args) {
      Main my_object = new Main();
      my_object.display();
   }
}

輸出

The numbers are defined as 12 and 30
The sum is: 42

示例 2

在此處正在計算兩個數字的乘積。

public class Main {
   int my_product;
   Main() {
      this(12, 30);
   }
   Main(int my_input_1, int my_input_2) {
      System.out.println("The numbers are defined as " +my_input_1 +" and " +my_input_2);
      this.my_product = my_input_1 * my_input_2;
   }
   void display() {
      System.out.println("The product of the two values is: " + my_product);
   }
   public static void main(String[] args) {
      Main my_object = new Main();
      my_object.display();
   }
}

輸出

The numbers are defined as 12 and 30
The product of the two values is: 360

更新於: 22-Feb-2022

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