String str1 = "AA"; String str2 = "AA"; String str3 = new String("AA"); System.out.println(str1==str2); //true
System.out.println(str1.equals(str2)); //true
System.out.println(str1==str3); //false
System.out.println(str1.equals(str3)); //true Person p1 = new Person("AA",12); Person p2 = new Person("AA",12);
System.out.println(p1.name == p2.name); //true都是0x1111
“AA”,name是一个引用变量