How to make fuction which add String into String?

This question already has an answer here:

Passing a String by Reference in Java? 13 answers

How do I concatenate two strings in Java? 19 answers

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I think you want something like this:

  public String addLine(String one, String two){
    return one+two;
}

Note, this returns a string, so in main do something like:

text = addLine(text, "line1");

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Make sure you create it as a method:

---

public class Text {
private String text = "Hello";
public Text(){}
public Text(String text){
    this.text = text;
}
public void setText(String text){
    this.text = text;
}
public void addLine(String lnToAdd){
    text += "n" +lnToAdd ;
}
public String getText(){
    return text;
}

}

---

public class Main {

public static void main(String[] args) {

    Text text = new Text("Hello");
    System.out.println(text.getText()); //Returns Hello
    System.out.println();
    text.addLine("Java");
    System.out.println(text.getText()); /*Returns Hello
                                                  Java*/
}

}

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