String 内存地址对比

public class Test {
public static void main(String[] args) {
String s = “abcdefg”;
String m = new String(“abcdefg”);
String n = “abcdefg”;
System.out.println(System.identityHashCode(s));
System.out.println(System.identityHashCode(m));
System.out.println(System.identityHashCode(n));
//s和n的内存地址一样 m与他俩的内存地址不一样
}
}