在类/方法之间交换数值

huangapple
go评论118阅读模式
英文:

Exchange values between classes/Methods

问题

  1. public class MainM {
  2.     public static void main(String[] args) {
  3.         Loop Q = new Loop();
  4.         Q.doOperation();
  5.     }
  6. }
  7. //------------------------------------------------------
  8. public class Loop {
  9.     public double b;
  10.     Sum R = new Sum();   // Java 出现问题的地方：在 Sum.<init>(Sum.java:3)
  11.     
  12.     public void doOperation() {
  13.         for (int i = 0; i < 10; i++) {
  14.             b = b + 2;
  15.             if (b <= 10) {
  16.                 R.operationFor1();
  17.             }
  18.         }
  19.     }
  20. }
  21. //--------------------------------------------------
  22. public class Sum {
  23.     Loop Q = new Loop();
  24.     
  25.     public void operationFor1() {
  26.         System.out.println("b " + Q.b);
  27.     }
  28. }

请注意，我只对代码进行了翻译，不包括代码中的问题或错误。如果您需要进一步的帮助，可以详细描述问题，我将尽力回答。

英文:

i recently learned the use of public, private and double in my different classes. But for some reason i cant understand why this is not working. My intention was to use three different classes as an exercise: I want Do() to make numbers from 0 to 20 and show only the numbers 0 till 10 on my console using the method for1() in a different class. Can someone please fix this issue? I dont need a shorter code or a code in just 1 class since i need it to educate myself using many classes. I would thank anyone if you could fix this issue using this kind of setup. Thanks in advance.

  1. public class MainM {
  2. 	public static void main(String[] args) {
  3. 		loop Q = new loop();
  4. 		Q.Do();
  5. 	}
  6. }
  7. //------------------------------------------------------
  8. public class loop {
  9. 	public double b;
  10. 	Sum R = new Sum();   // Java shows the problem is here : at Sum.&lt;init&gt;(Sum.java:3)
  11. 	public void Do() {
  12. 		for (int i = 0; i &lt; 10; i++) {
  13. 			b = b + 2;
  14. 			if (b &lt;= 10) {
  15. 				R.for1();
  16. 			}
  17. 		}
  18. 	}
  19. }
  20. //--------------------------------------------------
  21. public class Sum {
  22. 	loop Q = new loop();
  23. 	public void for1() {
  24. 		System.out.println(&quot;b &quot; + Q.b);
  25. 	}
  26. }
  28. </details>
  31. # 答案1
  32. **得分**: 0
  34. 你可以只保留 `print` 语句的 `Sum` 类，并且 `for1()` 方法应该有一个参数。以下是我的建议：
  36. ```java
  37. public class Sum {
  38.   public void for1(double b) {
  39.     System.out.println("b " + b);
  40.   }
  41. }

而你的循环类将会是：

  1. public class Loop {
  2.   public double b;
  3.   Sum R = new Sum();
  5.   public void Do() {
  6.     for (int i = 0; i < 10; i++) {
  7.       b = b + 2;
  8.       if (b <= 10) {
  9.           R.for1(b);
  10.       }
  11.     }
  12.   }
  13. }
英文:

You can have your Sum class only with the print statement and the method for1() should have one parameter. Bellow is my suggestion

  1. public class Sum {
  2.   public void for1(double b) {
  3.     System.out.println(&quot;b &quot; + b);
  4.   }
  5. }

And your loop class will be

  1. public class loop {
  2.   public double b;
  3.   Sum R = new Sum();
  5.   public void Do() {
  6.     for (int i = 0; i &lt; 10; i++) {
  7.       b = b + 2;
  8.       if (b &lt;= 10) {
  9.           R.for1(b);
  10.       }
  11.     }
  12.   }
  13. }

huangapple
  • 本文由 发表于 2020年10月18日 23:30:02
  • 转载请务必保留本文链接：https://go.coder-hub.com/64415064.html
  • class
  • java
  • loops
  • methods
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