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我怀疑我的概念在字符串池中是否清晰.请研究以下一组代码,并检查我的答案在以下一组陈述后创建的对象数量是否正确: -

1)

String s1 = "abc";
String s2 = "def";
s2 + "xyz";

2)

 String s1 = "abc";
 String s2 = "def";
 s2 = s2 + "xyz";

3)

String s1 = "abc";
String s2 = "def";
String s3 = s2 + "xyz";

4)

String s1 = "abc";
String s2 = "def";
s2 + "xyz";
String s3 = "defxyz";

根据我所知的概念,在上面的4个案例中,在执行每组行之后将创建4个对象.