String s="First";
String t=s; //深拷贝
String y=new String(s); //深拷贝
System.out.println("s:"+s+" t:"+t+" y:"+y);
s="Second";
System.out.println("s:"+s+" t:"+t+" y:"+y);
//t与y的值均未改变,故String为深拷贝
String s="First";
String t=s; //深拷贝
String y=new String(s); //深拷贝
System.out.println("s:"+s+" t:"+t+" y:"+y);
s="Second";
System.out.println("s:"+s+" t:"+t+" y:"+y);
//t与y的值均未改变,故String为深拷贝