public class ProgramName{
    public static void main(String args[]){
        //canonical entry point for application
    }
}

looping:
while(condition){
    // dostuff
}

//loop through everything in a collection. This case it's args.
for(String text : args){
    System.out.println(text);
}

if(condition){
    //do stuff
}
else{
    //otherwise
}
Else is optional. Remember dangling else though!

//here's a simple person class, as if you took it from an SQL server.
public class Person{
    private int IDNumber;
    private String fName;
    private String lName;
    private String pNumber; // really, you mostly treat these things as strings anyway, so why the fuck not?

    public Person(int IDNumber, String firstName, String lastName, String phoneNumber){
        this.IDNumber = IDNumber; //this refers to this class' member, as opposed to the one in the method call.
        fName = firstName;
        lName = lastName;
        pNumber = phoneNumber;
    }

    private Person(); // this means you can't call new Person() outside this class.

    public toString(){
        return fName + " " + lName + " Phone: " + pNumber + "\nInternalID: " +_IDNumber;
    }
}

you can now create Person objects with new Person(idNumber, "first name", "last name", "phone number"); but note that nothing validates the phone number.