java中字符串常量的串联
发布于 2021-01-30 16:47:35
在C ++中,创建多行字符串的最佳规范方法是创建相邻字符串,并让编译器在编译时将它们连接起来,如下所示:
string s = "This is a very long string ...\n"
" and it keeps on going...";
在Java中,我唯一知道的方法是串联:
String s = "This is a very long string ...\n" +
" and it keeps on going...";
问题是,这是在运行时生成单个字符串,还是Java实际上也在编译时进行连接?出现此问题的原因是由于以下行为:
String s1 = "abc";
String s2 = "abc";
System.out.println(s1 == s2); // this prints true, because the compiler
// generates only one "abc" object
String s3 = "a";
s3 += "bc";
System.out.println(s1 == s3); // false
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