搞清楚如何返回此递归函数？

Question

New to the java programming language and confused how to run this code! I am using Eclipse.

public static String random(String n)
{
    int F = n.length();
    if(F <= 1) return n;
    String b = n.substring(0, F/2);
    String c = n.substring(F/2, F);
    return random(c) + random(b);
}

I am new to running java programs in the terminal window and I can't seem to figure out how to get the return value.

Answer 1

Put it into a class like this

public class MyRandom {

   public static void main(String[] args) {
    System.out.println(random("abc"));
   } 

   public static String random(String n) {
    int length = n.length();

    if (length <= 1)
        return n;
    String b = n.substring(0, length / 2);
    String c = n.substring(length / 2, length);
    return random(c) + random(b);
   }
}

and then right click on the file and choose "Run As"

Answer 2

You can use the following code in your main method:

System.out.println(random("Hello"));

Since random method returns a String , you can print it out in the terminal.

Answer 3

将对函数的调用包装在标准输出中，如下所示： System.out.println(random("test"));

Answer 4

String returnValue = random("YourNString");

So the return value will be stored in returnValue

Then your can do System.out.println(returnValue)

Or simply do System.out.println(random("YourNString"));