How to random generate different First and Last Name of users to a List with using Random Generator in java?

I have generate a User class which include the first name and the last name. I wan to ask how can i generate different random name with using random generator?

import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;

public class User {
private String firstName;
private String lastName;
private int age;

/**
 * @return the firstName
 */
public String getFirstName() {
    return firstName;
}
/**
 * @param firstName the firstName to set
 */
public void setFirstName(String firstName) {
    this.firstName = firstName;
}
/**
 * @return the lastName
 */
public String getLastName() {
    return lastName;
}
/**
 * @param lastName the lastName to set
 */
public void setLastName(String lastName) {
    this.lastName = lastName;
}
/**
 * @return the age
 */
public int getAge() {
    return age;
}
/**
 * @param age the age to set
 */
public void setAge(int age) {
    this.age = age;
}


}

Can anyone show me some snippet code on how to deal with this generator?? Please teach me. Thank you.