cmdline

1:41:28 naga% javac *.java
Two.java:1: error: constructor One in class One cannot be applied to given types;
public class Two extends One {
       ^
  required: String
  found: no arguments
  reason: actual and formal argument lists differ in length
1 error
[1]    74242 exit 1     javac *.java

One.java

public class One {
  protected String arg;

  public One(String arg) {
    this.arg = arg;
  }
}

Two.java

public class Two extends One {
  public void print() {
    System.out.println(this.arg);
  }
}