这段程序的输出?
public class PassS{
public static void main (String [] args) {
PassS p = new PassS();
p.start();
}
void start(){
String s1 = "slip";
String s2 = fix(s1);
System.out.println(s1+" "+s2);
}
String fix (String s1){
s1 = s1 + "stream";
System.out.print(s1 + " ");
return "stream";
}
}
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上段代码的输出 ,和原因???