java 如何将变量分配给静态方法的返回语句？
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How to assign a variable to the return statement of a static method?
提问by Gen
I cant seem to get the value of the second method please teach me how I'm still a beginner at this. Do I have to use a different variable? And if so how do I assign the return value of that method to the said variable?
我似乎无法获得第二种方法的价值，请教我如何在这方面仍然是初学者。我必须使用不同的变量吗？如果是这样，我如何将该方法的返回值分配给所述变量？
import java.util.Scanner ;
class JavaChip
{
static Scanner s = new Scanner(System.in) ;
static double val ;
public static void main( String[] args )
{
displayLine () ;
System.out.print ("Enter number of cups of Mocha JavaChip: ");
val = getMocha( s.nextDouble() ) ;
System.out.print ("The grams of mocha is: " + val ) ;
System.out.print ("\nThe grams of sugar is: " + val ) ;
displayLine () ;
}
static double getMocha ( double c )
{
return ( 1.215 * c ) ;
}
static double getSugar (double c)
{
val = ( 0.15 * c ) ;
return val ;
}
static void displayLine()
{
System.out.println("\n\n[][][][][][][][][][][][][][][][][][][]") ;
System.out.println("[][][][][][][][][][][][][][][][][][][]") ;
}
}
回答by Peter Lawrey
If you want to use the value of a method you have to call it.
如果你想使用一个方法的值，你必须调用它。
val = getSugar(num);
Using static fields to pass arguments or return values is bad practice. This is likely to cause confusion and be a cause of subtle multi-threaded bugs. Its also more complex than just returning the value like you do with getMocha()
使用静态字段传递参数或返回值是不好的做法。这很可能会引起混乱并导致微妙的多线程错误。它也比仅仅像你那样返回值更复杂getMocha()
回答by Naor
Actually you should saparate your project into two files:
1. File that will include the main function and helper functions of display like displayLine.
2. File that wil represent the business of your project (JavaChip?).
实际上，您应该将您的项目分成两个文件：
1. 将包含显示的主要功能和辅助功能的文件，例如 displayLine。
2. 代表项目业务的文件（JavaChip？）。
Example:
例子：
Program.java:
程序.java：
class Program
{
public static void main( String[] args )
{
displayLine () ;
System.out.print ("Enter number of cups of Mocha JavaChip: ");
Scanner s = new Scanner(System.in) ;
JavaChip jc=new JavaChip();
double val = jc.getMocha( s.nextDouble()) ;
System.out.print ("The grams of mocha is: " + val ) ;
val = jc.getSugar( s.nextDouble());
System.out.print ("\nThe grams of sugar is: " + val ) ;
displayLine () ;
}
static void displayLine()
{
System.out.println("\n\n[][][][][][][][][][][][][][][][][][][]") ;
System.out.println("[][][][][][][][][][][][][][][][][][][]") ;
}
}
JavaChip.java:
JavaChip.java：
class JavaChip
{
public JavaChip()
{
}
public double getMocha ( double c )
{
return ( 1.215 * c ) ;
}
public double getSugar (double c)
{
val = ( 0.15 * c ) ;
return val ;
}
}
回答by Android Killer
Your code is 100% correct.Just you are not calling that getSugar(double value) method. Just do the same as you did for getMocha(double value).Then you can get the return value.
您的代码 100% 正确。只是您没有调用该 getSugar(double value) 方法。就像你对 getMocha(double value) 所做的一样。然后你就可以得到返回值。
