关于java方法的问题 [英] Question about java methods

问题描述

以下声明

The following statement

public double getValue(double new_value)
{

getValue = 5+8;

return getValue
}

<pre>

在驱动程序类中编写以下代码





s.getValue（0）;















这项工作与否？



我尝试了什么：



我对这个规则感到困惑

in the driver class the following code is written


s.getValue(0);







Would this work or not?

What I have tried:

I am just confused about the rules for this one

推荐答案

好吧，它会编译并运行。例如，尝试：

Well, it would compile and run. Try, for instance:

class Foo
{
  double getValue;

  public double getValue(double new_value)
  {

    getValue = 5+8;

    return getValue;
  }

  public static void  main(String args[])
  {
    Foo foo = new Foo();
    double g = foo.getValue(5);
    System.out.format("getValue is %g\n", g);
  }

}

然而，这样的代码将是的噩梦维护者不好： getValue 非常名称提示'getter'方法，这是一种在不改变对象状态的情况下返回值的方法。事实上它的主体改变了对象的状态。

此外，传递的 newValue 参数在方法体中没有任何效果。

However, such a code would be a nightmare for the poor maintainer: getValue very name suggest a 'getter' method, that is a method returning a value without changing the state of the object. As matter of fact its body changes the state of the object.
Moreover, the passed newValue parameter has no effect in the method body.

请参阅 Java™教程 [ ^ ]。

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