class ObjectTest
{
public static void main(String[] args)
{
Person p = new Person();
String str = new String("Person@2a139a55");
String str1 = "Person@2a139a55";
String str2 = String.valueOf(p);
System.out.println(p);//输出结果：Person@2a139a55
System.out.println(str);//输出结果：Person@2a139a55
System.out.println(str1);//输出结果：Person@2a139a55
System.out.println(str2);//输出结果：Person@2a139a55
}
}
class Person
{
private String name = "Keep_Going";
private String gender = "man";
str,str1,str2有什么区别