CSC300: Python to Java: Function declarations

Python Java

def addHello(x):
    return "Hello " + x

def main():
    print(addHello("Bob"))
    print(addHello("Alice"))

if __name__ == "__main__":
    main()

package algs11;
import stdlib.*;
public class Hello {
  public static String addHello (String x) {
    return "Hello " + x;
  }
  public static void main (String[] args) {
    StdOut.println (addHello ("Bob"));
    StdOut.println (addHello ("Alice"));
  }
}

Java requires declaration of return type and parameter types.

Because of types, java compiler can catch more errors, as below. What's wrong?

Python Java

def addHello(x):
    "Hello " + x

def main():
    print(addHello("Bob"))
    print(addHello("Alice"))

if __name__ == "__main__":
    main()

package algs11;
import stdlib.*;
public class Hello {
  public static String addHello (String x) {
    "Hello " + x;
  }
  public static void main (String[] args) {
    StdOut.println (addHello ("Bob"));
    StdOut.println (addHello ("Alice"));
  }
}