Question

How to convert ArrayList to StringBuilder in Java

Answer 1

import java.util.ArrayList;
 
public class MyClass {
    static StringBuilder convertToStringBuilder(ArrayList<String> al) {
        StringBuilder sb = new StringBuilder();
            
        for (String s : al) {
            sb.append(s);
            sb.append(" ");
        }
        sb.setLength(sb.length() - 1);
        
        return sb;
    }
    public static void main(String args[]) {
        ArrayList<String> al = new ArrayList<String>();
   
        al.add("java");
        al.add("c");
        al.add("php");
        al.add("python");
        al.add("c++");
         
        StringBuilder sb = convertToStringBuilder(al);
         
        System.out.println(sb);
    }
}
   
  
  
   
/*
run:
  
java c php python c++
  
*/

 

70+ SQL courses for beginners and professionals