一道String面试题

能用代码解决不瞎比比!

public class Test {    public static void changeStr(String str) {        str = new String("welcome");    }    public static void main(String[] args) {        String str = "1234";        changeStr(str);        System.out.println(str);    }}

结果是welcome

public class Test {    public static void changeStr(String str) {        str = new String("welcome");    }    public static void main(String[] args) {        String str = new String("1234");        changeStr(str);        System.out.println(str);    }}

结果是1234

String str1 = “1234”; //指向堆内存
String Str2 = new String(“1234”); //指向常量池