java - Whether to use generics or not? -

i have following hierarchy of classes

public abstract class myabstractclass {  }  public abstract class abstractclassa extends myabstractclass {  } public class abstractclassb extends myabstractclass {  } public class classa extends abstractclassa {  } public class classb extends abstractclassa {  } 

i have converter should accept instance of class extending abstractclassa , should return instance of class extending abstractclassb. have 2 versions of conversion class 1 using generic , other 1 not. both works fins. correct way of specifying signature of converter?

public class convertertwo {     public abstractclassb convert(abstractclassa a) { } }  public class converterone { public <a extends abstractclassa, b extends abstractclassb> b convert(a a) { } } 

generics checked @ compile time , replaced proper types during compilation.

convertertwo code converted converterone kind of code during compilation , both equivalent.

generics useful when write api not know kind of objects consumer of api's going pass. in case, if plan write generic adapter.

classic example of genrics : collection interface , classes implement it.