无法对数组

Question

我坚持完成一项任务，我应该编写两种方法，按升序和降序对数组进行排序。当我在其中一个方法上添加块注释时，它们都可以单独工作，但是当我同时使用它们时，我从两个方法中得到相同的结果。我已经获得了第一堂课，而且我不应该改变其中的任何内容。我写的第二节课，它是不能同时工作的sortAsc和sortDesc方法。非常感谢任何提示！

Exercise4a课程：

public class Exercise4a {
    public static int[] parseString( String str ) {
        String[] nbr = str.split( "," ); // Ex: strängen "13,4,7,9" blir arrayen {"13","4","7","9"}
        int[] res = new int[ nbr.length ];
        for( int i = 0; i < nbr.length; i++ ) {
            res[ i ] = Integer.parseInt( nbr[i] );
        }
        return res;
    }

    public static void main(String[] args) {
        String message = "";
        String str = JOptionPane.showInputDialog( null, "Mata in heltal separerade med komma-tecken", "1,5,3,4,6,5,3,5,9,7,6");
        int[] test1 = parseString( str );
        int[] test2;

        message += "Vektor: " + IntegerArrays.toString( test1 ) + "\n";
        message += "Störst: " + IntegerArrays.max( test1 ) + "\n";
        message += "Minst: " + IntegerArrays.min( test1 ) + "\n";
        message += "Summa: " + IntegerArrays.sum( test1 ) + "\n";
        message += "Medelvärde: " + String.format( "%1.2f", IntegerArrays.average( test1 ) ) + "\n";
        message += "Range: " + IntegerArrays.range(test1) + "\n";
        test2 = IntegerArrays.copy(test1);
        message += "test2: " + IntegerArrays.toString( test2 ) + "\n";
        IntegerArrays.sortAsc(test1);
        IntegerArrays.sortDesc(test2);
        message += "test1: " + IntegerArrays.toString( test1 ) + "\n";
        message += "test2: " + IntegerArrays.toString( test2 ) + "\n";
        JOptionPane.showMessageDialog( null, message );
    }
} 

IntegerArrays类：

import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Collections;

public class IntegerArrays {
    public static String toString(int[] array){
        String res = "{";
        for(int i = 0; i < array.length; i++){

            res += array[i];
            if(i < array.length-1){
                res += ",";
            }


        }res += "}";
        return res;
    }

    public static int max(int[] array){
        int max = Integer.MIN_VALUE;
        for(int i = 0; i < array.length; i++){
            if(array[i] > max){
                max = array[i];
            }
        }return max;
    }
    public static int min(int[] array){
        int min = Integer.MAX_VALUE;
        for(int i = 0; i < array.length; i++){
            if(array[i] < min){
                min = array[i];
            }
        }return min;
    }
    public static int sum(int[] array){
        int sum = 0;
        for(int i = 0; i < array.length; i++){
            sum += array[i];
        }
        return sum;
    }
    public static double average(int[] array){
        double average = 0;
        int counter = 0;
        for(int i = 0; i < array.length; i++){
            average += array[i];
            counter++;
        }
        return average/counter;
    }
    public static int range(int[] array){
        int max = Integer.MIN_VALUE, min = Integer.MAX_VALUE;
        for(int i = 0; i < array.length; i++){
            if(array[i] <= min ){
                min = array[i];
            }
            else if(array[i] >= max ){
                max = array[i];
            }

        }return max - min;


    }
    public static int[] sortAsc(int[] array){
//      for(int i = 0; i < array.length; i++){
//        for(int j = 0; j < array.length; j++){
//          if(array[i] > array[j]){
//              int temp;   
//              temp = array[i];
//              array[i] = array[j];
//              array[j] = temp;
//  
//          }
//        }
//      }return array;
Arrays.sort(array);
return array;
    }
    public static int[] sortDesc(int[] array){

                for(int i = 0; i < array.length/2; i++){
            int temp = array[i];
            array[i] = array[array.length - i - 1];
            array[array.length - i - 1] = temp;
        }
        return array;
    }   

    public static int[] copy(int[] array){
        int[] newArray = array;
        return newArray;
    }

}