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publicstaticvoid changeStr(String str){
str="welcome";
}
publicstaticvoid changeStr(String str){
str= new String("welcome");
}
publicstaticvoid changeStr(MyClass a){
a.attribute = "12123";//注意不是new哦!
}
public static void main(String[] args) {
String a = "a";
a = "b";
System.out.println(a);
}