javaで配列をソートする方法

import java.util.Arrays;
import java.util.Collections;

public class ArraySorting{

    public static void main(String args[]){

        String[]unsortStringArray = new String[]{"c", "b", "a", "3", "2", "1"};
        int[]unsortIntArray = new int[]{7,5,4,6,1,2,3};

        System.out.println("Before sort");
        System.out.println("--- unsortStringArray ---");
        for(String temp: unsortStringArray){
            System.out.println(temp);
        }
        System.out.println("--- unsortIntArray ---");
        for(int temp: unsortIntArray){
            System.out.println(temp);
        }

       //sort it
        Arrays.sort(unsortStringArray);
        Arrays.sort(unsortIntArray);

        System.out.println("After sorted");
        System.out.println("--- unsortStringArray ---");
        for(String temp: unsortStringArray){
            System.out.println(temp);
        }
        System.out.println("--- unsortIntArray ---");
        for(int temp: unsortIntArray){
            System.out.println(temp);
        }

       //sort it, reverse order
        Arrays.sort(unsortStringArray,Collections.reverseOrder());

        System.out.println("After sorted - reserved order");
        System.out.println("--- unsortStringArray ---");
        for(String temp: unsortStringArray){
            System.out.println(temp);
        }

    }

}

Before sort
--- unsortStringArray ---

c
b
a
3
2
1
--- unsortIntArray ---
7
5
4
6
1
2
3
ソート後
--- unsortStringArray ---

1
2
3
a
b
c
--- unsortIntArray ---
1
2
3
4
5
6
7
ソート済み予約注文後
--- unsortStringArray ---

c
b
a
3
2
1