在Java中创建多变量函数

Question

I am trying to make a function that I can refer to in my main method. With a double variable input X and string input Y, I want the function to do the following:

 BigDecimal bdX = new BigDecimal(X);
 String strX = String.valueOf(bdX.doubleValue());
 strX = strX.replaceAll("E", " x 10^");

 System.out.println("\nOutput = " + strX + Y);

In python you could define a function like so:

def FunctionName(X,Y) {
//tasks
}

How do I do this in Java? And how would I call on it? Thanks!

Answer 1

First you will need to convert double to String . And If you want to return that String then:

public static String function(double x, String y) { 
    String strX = Double.toString(x); //String.valueOf(x) would have worked fine too
    strX = strX.replaceAll("E", " x 10^");
    return strX + y;
}

Or if you just want to print it out and donot want it to return that String , then

public static void function(double x, String y) { 
    String strX = Double.toString(x);
    strX = strX.replaceAll("E", " x 10^");
    System.out.println("\nOutput = " + strX + Y);
}

Then you will just call the above method in your main method.

ps: I converted double to String because why take that extra step of converting it to BigDecimal first and then convert it to String .

Answer 2

I don't know if I understood you right, but I try to anser you ^^

If you want to call the method from the main method, you have to make your method static.

It would look like:

public static void main(String args) {
    yourMethod(10.0, "Test"); // calls your method with example params
}

public static void yourMethod(double X, String Y) {
    // Your tasks
    BigDecimal bdX = new BigDecimal(X);
    String strX = String.valueOf(bdX.doubleValue());
    strX = strX.replaceAll("E", " x 10^");
    System.out.println("\nOutput = " + strX + Y);
}