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return value java problem

I don't understand when studying Java, but create a getUserAge method with the return value and call it with the main method. > Ten years later, I'm 30!
I want to output and I am in trouble.

I would appreciate any solution.

Source code
↓
public class Main {
static int getUserAge () {
int num = 20;
return num;
}
public static void main (String [] args) {
System.out.println ("10 years later" + getUserAge () + "I'm old!");
}
}

java javaapplet
  • Answer # 1 

    public class Main {
    static int getUserAge () {
        int num = 20;
        return num + 10;
    }
    public static void main (String [] args) {
        System.out.println ("10 years later" + getUserAge () + "I'm old!");
    }
}

  • Answer # 2

    System.out.println ("I'm 30 years old in 10 years!");

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