Question

How can I sort an array in Java - for numbers and for strings (let's say in alphabetical order)?

Are there any methods of some classes which can be used?

Thanks

Answer 1

You can use the Class Array and it's method .sort();

Inside the sort brackets put your array's name and it will sort it;

This method can be used for sorting integers and strings - in alphabetical order as you wish :-)

Here is the code (SEE LINES 13 & 28):

package com.tutorials7.java.useful_codes;

import java.util.Arrays;

public class SortArray {
    public static void main(String[] args) {
        System.out.println("Array ints[] WITHOUT sorting:");
        int[] ints = {30, 14, 5, 0, 743432};
        for (int i = 0; i < ints.length; i++) {
            System.out.println(ints[i]);
        }

        Arrays.sort(ints);//Class Arrays and it's METHOD FOR SORTING ARRAYS CALLED .sort()

        System.out.println("Array ints[] WITH sorting:");
        for (int i = 0; i < ints.length; i++) {
            System.out.println(ints[i]);
        }

        System.out.println("////////////////////////////////////////////////");

        System.out.println("Array stringsArray[] WITHOUT sorting:");
        String[] stringsArray = {"R", "A", "S", "F", "B", "N", "A", "L"};
        for (String s : stringsArray) {
            System.out.println(s);
        }

        Arrays.sort(stringsArray);//SORTS THE ARRAY IN ALPHABETICAL ORDER

        System.out.println("Array stringsArray[] WITH sorting:");
        for (String stringValue : stringsArray) {
            System.out.println(stringValue);
        }
    }
}

Here's the output:

Array ints[] WITHOUT sorting:
30
14
5
0
743432
Array ints[] WITH sorting:
0
5
14
30
743432
////////////////////////////////////////////////
Array stringsArray[] WITHOUT sorting:
R
A
S
F
B
N
A
L
Array stringsArray[] WITH sorting:
A
A
B
F
L
N
R
S

Process finished with exit code 0