compare and update a string

Question

I am trying to find a way, how to compare two strings and upgrade the first, when the second has more in it. For example

String A="This is a statement!"; 
String B="This is a statement! Good luck!"; 
if(A<B{   //B has more letters
        //Upgrade A }
  else{ //Upgrade B
      }

I mean with upgrade not overwriting like A=B. My strings has usually much lines. I want to keep the value of the string and just insert the new things from the other String. Has someone an idea?

EDIT: Thank you for the nice answers. Unfortunetly I didnt exlain it more clear, sorry my fault. My problem is, that I do now know where the changes are, the strings could look like this:

String A: 
A 
B 
C//Good morning, sir 
D//A comment 
E


String B: 
A 
B//Yes 
C 
D 
DD 
E

The result should be: 
A 
B//Yes 
C//Good morning, sir 
D//A comment 
DD 
E

What's upgrade? Also, what happens if the strings does not share a prefix? Note that Java does not have operator overloading, and even if it has, < will most likely compare the lexical ordering. — zw324
– zw324, Commented Jun 28, 2013 at 14:23
Write "String length Java" and you'll be amazed from the results! — Maroun
– Maroun, Commented Jun 28, 2013 at 14:24

KBorja · Accepted Answer · 2013-06-28 14:28:47Z

2

I guess you need something like this:

String A="This is a statement!"; 
String B="This is a statement! Good luck!";

if (A.length() < B.length()){   //B has more letters
        A += B.subString(A.length(), B.length()-1);
} else{ 
        B += A.subString(B.length(), A.length()-1);
}

Hope this is what you are looking for :).

answered Jun 28, 2013 at 14:28

KBorja

2571 gold badge5 silver badges15 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Hayabusa Over a year ago

Thank you. Of course this is the best solution for the problem I described by an oversight. I ll mark this as solution for sure.

jh314 · Accepted Answer · 2013-06-28 14:26:46Z

1

How about this:

if(A.length() < B.length() {   //B has more letters
    //Upgrade A 
}
else { //Upgrade B

}

answered Jun 28, 2013 at 14:26

jh314

27.9k16 gold badges66 silver badges83 bronze badges

Comments

user1907906 · Accepted Answer · 2013-06-28 14:25:39Z

0

Use String.length() to get the length of a String.

answered Jun 28, 2013 at 14:25

user1907906

Comments

SeniorJD · Accepted Answer · 2013-06-28 14:26:53Z

0

Compare the Strings by length:

if (A.length() > B.length()) {
    B = A;
} else {
    A = B;
}

answered Jun 28, 2013 at 14:26

SeniorJD

7,2624 gold badges38 silver badges53 bronze badges

Comments

commit · Accepted Answer · 2013-06-28 14:27:15Z

0

Try this

if(!B.contains(A)){
   A = B;
}

answered Jun 28, 2013 at 14:27

commit

4,82715 gold badges45 silver badges71 bronze badges

Comments

hd1 · Accepted Answer · 2013-06-28 14:27:33Z

0

if (B.length() > A.length()) { // upgrade B as it's longer 
} else if (A.length() > B.length()) { // upgrade A as its longer
} else if (A.length() == B.length()) { // not sure what to do here as they're of equal length
}

Aside from null-checking, I believe this encompasses every possible case.

answered Jun 28, 2013 at 14:27

hd1

34.9k5 gold badges83 silver badges95 bronze badges

Comments

nsfyn55 · Accepted Answer · 2013-06-28 14:29:01Z

0

I mean you'll use a combination of subsString() and length(). Take b.subString(a.length, b.length-1) and concatenate that substring to a

answered Jun 28, 2013 at 14:29

nsfyn55

15.4k9 gold badges53 silver badges79 bronze badges

Comments

TroyAndAbed · Accepted Answer · 2013-06-28 14:29:28Z

0

Use String.length() to compare the size then concat the end of the longest chain.

String a="This is a statement!"; 
String b="This is a statement! Good luck!"; 

if(b.length() > a.length()) {
    a = a.concat(b.substring(a.length()));
}
else if(a.length() > b.length())
{
    b = b.concat(a.substring(b.length()));
}

answered Jun 28, 2013 at 14:29

TroyAndAbed

3011 silver badge10 bronze badges

Comments

Naveen Kumar Alone · Accepted Answer · 2013-06-28 14:34:37Z

0

Compare strings by length, using String.length() For example

public class Test{
   public static void main(String args[]){
      String Str1 = new String("This is a statement!");
      String Str2 = new String("This is a statement! Good luck!" );

     if(Str1.length() > Str2.length())
        Str2 += Str1;
     else
        Str1 += Str2;
}

edited Jun 28, 2013 at 14:34

answered Jun 28, 2013 at 14:26

Naveen Kumar Alone

7,6985 gold badges40 silver badges59 bronze badges

Comments

cyberpirate92 · Accepted Answer · 2013-06-28 14:39:37Z

0

Hope this helps.

if(A.contains(B) && !A.equals(B))
{
  A += B.substring(A.length(),B.length());
}

answered Jun 28, 2013 at 14:39

cyberpirate92

3,1865 gold badges30 silver badges48 bronze badges

Comments

michaelb958--GoFundMonica · Accepted Answer · 2013-06-28 14:43:17Z

0

String A = "This is a statement!"; 
String B = "This is a statement! Good luck!"; 
if (B.length() > A.length()) { //B has more letters
    //Upgrade A
} else {
    //Upgrade B
}

edited Jun 28, 2013 at 14:43

michaelb958--GoFundMonica

4,7367 gold badges34 silver badges35 bronze badges

answered Jun 28, 2013 at 14:26

mistahenry

8,7343 gold badges29 silver badges40 bronze badges

Collectives™ on Stack Overflow

compare and update a string

11 Answers 11

1 Comment

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

11 Answers 11

1 Comment

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related