求教单例模式的有关问题.

public class A {    private String name;    private static A instance = new A();    private A(){}    public A getInstance() {        return instance;    }    public String getName() {        return name;    }}public class B {    private static String name;        private B(){}    public static String getName() {        return name;    }}请问: A.getInstance().getName();与B.getName();的区别.