Convert the string into stringBuilder in java

Question

I have one method which returns the string but I want the data inside the method in StringBuilder and convert it into string then how can I do it?

  public String[][] getDataOfJD(List<JobDescriptionField> jdFields) {
  int i = 0;
  String [][] data = new String[jdFields.size()][];
  for(JobDescriptionField field : jdFields) {
      if (i > 0){
          String messages = "";
          for (String message : field.getMessages()){
             messages += message;
          }
     data [i] = new String[]{field.getTitle(), field.getField(), messages, field.getScore() + ""};
  }
    i++;
    score = score + field.getScore();
  }
  return data;
  }

From above example field.getTitle(), field.getField() are of String type And if I want the data in StringBuilder and needs to convert it into string but if I tried to do it by return data.toString then it is giving error. Please Help me.

Please share both your attempt and the error message as part of your question. — TimoStaudinger, Jun 18 '16 at 19:16
Also note that `StringBuffer` and `StringBuilder` are two (similar but) different classes in Java. — TimoStaudinger, Jun 18 '16 at 19:17
Sorry Actually I want the data variable in StringBuilder not in STringBuffer. And if I convert the data to string then on {field.getTitle(), field.getField(), messages, field.getScore() + ""}; } this line its giving error like incompatibletype . required StringBuilder but it is string — namrata shahade, Jun 18 '16 at 19:19
What do you want the `StringBuilder` to do? Just concatenate all those strings, without any separators? That'll look really bad. --- *"I tried to do it"* Then show us what you tried, so we can help let you know what you did wrong. — Andreas, Jun 18 '16 at 19:38
Is the problem solved now? If not what is the format of the output you expect? — ujulu, Jun 19 '16 at 07:43

score 17 · Answer 1 · edited May 23 '17 at 11:54

To create a StringBuilder from a String simply:

StringBuilder sb = new StringBuilder("MyString");
String s = sb.toString();

But as was said StringBuilder and StringBuffer are different. Take a look here for more information on StringBuilder and StringBuffer

https://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html https://docs.oracle.com/javase/7/docs/api/java/lang/StringBuffer.html

Difference between StringBuilder and StringBuffer

score 6 · Answer 2 · answered Aug 05 '18 at 19:56

6

Convert String to StringBuilder

String someText = "something...";
StringBuilder sb = new StringBuilder(someText);

answered Aug 05 '18 at 19:56

lincollincol

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flawless answer! – Gaurav Jun 08 '19 at 12:20

score 1 · Answer 3 · edited Dec 20 '21 at 12:25

1

String str = "rahul";
System.out.println(str.getClass().getName());   
StringBuilder sb1 = new StringBuilder(str); // way 1
StringBuilder sb2 = new StringBuilder(); // way 2
sb2.append(str);
System.out.println(sb1.getClass().getName());
System.out.println(sb2.getClass().getName());

I hope the code above explains everything.

edited Dec 20 '21 at 12:25

Neuron

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answered Dec 26 '18 at 13:18

rahul

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score 0 · Answer 4 · answered Oct 24 '19 at 12:17

0

StringBuilder has a constructor that accepts string

https://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html#StringBuilder(java.lang.String)

StringBuilder sb = new StringBuilder("my string");

answered Oct 24 '19 at 12:17

ifelse.codes

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Convert the string into stringBuilder in java

4 Answers4