método burbuja genérica - no estática, Java

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//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_72

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String[] args) {
        Rextester app = new Rextester();
        
        Integer[] intArray = new Integer[]{7, 4, 9, 2, 6, 10};
        app.burbuja(intArray);

System.out.println("Lista ordenada de enteros:");
        for (int i : intArray) {
            System.out.println(i);
        }

System.out.println();
        String[] stringArray = new String[]{"suelo", "cielo", "piso", "piedra", "adentro"};
        app.burbuja(stringArray);

System.out.println("Lista ordenada de cadenas:");
        for (String s : stringArray) {
            System.out.println(s);
        }
    }

public <T extends Comparable<T>> void burbuja(T[] v) {
        boolean bandera = true;
        int superior = v.length;
        while (bandera) {
            bandera = false;
            superior--;
            for (int i = 0; i < superior; i++) {
                if (v[i].compareTo(v[i + 1]) > 0) {
                    T temp = v[i];
                    v[i] = v[i + 1];
                    v[i + 1] = temp;
                    bandera = true;
                }
            }
        }
    }
}

[ + ] Show input
Compilation time: 0.62 sec, absolute running time: 0.13 sec, cpu time: 0.06 sec, memory peak: 19 Mb, absolute service time: 0,76 sec