String str = new String("aaa");
String str2 = new String("aaa");
System.out.println(str);
System.out.println(str2);
System.out.println(str == str2);
System.out.println("----------------");
String str3 = "bbb";
String str4 = "bbb";
System.out.println(str3);
System.out.println(str4);
System.out.println(str3 == str4);
System.out.println("----------------");
输出 aaa aaa false
bbb bbb true