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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
class Student{
	public String name;
	public String surname;
}
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Student a = new Student();
		a.name = "hello";
		a.surname = "heloooo";
		Student b = new Student();
		b.name = "helllllo";
		b.surname = "helooooooo";
		ArrayList<Student> students = new ArrayList<Student>();
		students.add(a);
		students.add(b);
		Gson gson = new GsonBuilder().create();
        String newstring = gson.toJson(matchList);
        System.out.println(newstring);
	}
 
}

Main.java:24: error: cannot find symbol
		Gson gson = new GsonBuilder().create();
		^
  symbol:   class Gson
  location: class Ideone
Main.java:24: error: cannot find symbol
		Gson gson = new GsonBuilder().create();
		                ^
  symbol:   class GsonBuilder
  location: class Ideone
Main.java:25: error: cannot find symbol
        String newstring = gson.toJson(matchList);
                                       ^
  symbol:   variable matchList
  location: class Ideone
3 errors

Standard output is empty