public class xx {
public static void main(string[] args) { 
string s1 = "you are hired!";
string s2 = "you are hired!";
if (s1==s2) {
system.out.println("一个内存空间");
} else {
system.out.println("不是一个内存空间");
}
}
}

public class xx {
public static void main(string[] args) { string s1 = "you are hired!";
string s2 = "you are hired!";
s1 = s1.replace('h','f');
system.out.println(s1);
if (s1==s2) {
system.out.println("一个内存空间");
} else {
system.out.println("不是一个内存空间");
}
}
}