final String a = "a";
final String b = "b";
String c = a+b;
String d = "b";
String e = a+d;
System.out.println(c == "ab" ? true : false);
System.out.println(e == c ? true : false);
final String a = "a";
final String b = "b";
String c = a+b;
String d = "b";
String e = a+d;
System.out.println(c == "ab" ? true : false);
System.out.println(e == c ? true : false);