pass-by-value.java

class TestingPassByValue() {
  public static void main(String ... args){
    // myFavoriteHobby is Playing billard
    Hobby myFavoriteHobby = new Hobby("Playing billard"); 
    // hobbyBackup is Playing billard
    Hobby hobbyBackup = myFavoriteHobby; 

    // passing the value. Simply, you can think it 
    // like passing the value of the pointer (e.g. 42)
    hobbyGame(myFavoriteHobby); 
    // at this point, myFavoriteHobby is Learning challenging stuff. 
    // Below is true. The thing is, they both keep the address 42
    // Value @42 is changed but the address, 42, is the same.
    hobbyBackup.equals(myFavoriteHobby); // true
  }

  // hobby is Playing billard (myFavoriteHobby), they both point to the address 42
  public void hobbyGame(Hobby hobby){ 
    // hobby is Learning challenging stuff (myFavoriteHobby)
    hobby.setName("Learning challenging stuff");  

    // Below, we point address 79, so hobby=79, myFavoriteHobby=42. 
    // Changes won't affect myFavoriteHobby
    // hobby is Listening some good music
    hobby = new Hobby("Listening some good music"); 
  }
 }