Example 1: sort array java
import java. util. Arrays;
Arrays. sort(array);
Example 2: how to declare an array in java
An array is an ordered collection of elements of the same type, identified by a pair of square brackets [].
To use an array, you need to:
1. Declare the array with a name and a type. Use a plural name for array, e.g., marks, rows, numbers. All elements of the array belong to the same type.
2. Allocate the array using new operator, or through initialization, e.g.
int[] marks;
int marks[];
marks = new int[5];
int[] factors = new int[20];
int[] numbers = {11, 22, 33, 44, 55, 66};
Example 3: Arrays.sort() in java
import java.util.Arrays;
public class SortStringAlphabeticalOrder
{
public static void main(String[] args)
{
String[] strAsc = {"Bear","Fox","Deer","Cheetah","Anteater","Elephant"};
System.out.println("Before sorting: ");
for(String string : strAsc)
{
System.out.println(string);
}
Arrays.sort(strAsc);
System.out.println("-----------------------------------");
System.out.println("After sorting: ");
for(String str : strAsc)
{
System.out.println(str);
}
}
}
Example 4: Arrays.sort() in java
public class WithoutSortMethod
{
public static void main(String[] args)
{
int temp;
int[] arrNumbers = {14, 8, 5, 54, 41, 10, 1, 500};
System.out.println("Before sort: ");
for(int num : arrNumbers)
{
System.out.println(num);
}
for(int a = 0; a < arrNumbers.length; a++)
{
for(int b = a + 1; b < arrNumbers.length; b++)
{
if(arrNumbers[a] > arrNumbers[b])
{
temp = arrNumbers[a];
arrNumbers[a] = arrNumbers[b];
arrNumbers[b] = temp;
}
}
}
System.out.println("---------------");
System.out.println("After sort: ");
for(int num : arrNumbers)
{
System.out.println(num);
}
}
}
Example 5: sort array java
Here’s the java program to sort an array using Arrays.sort() method.
import java.util.Arrays;
public class JavaArraySortMethod
{
public static void main(String[] args)
{
String[] strGiven = {"Great Barrier Reef", "Paris", "borabora", "Florence","tokyo", "Cusco"};
Arrays.sort(strGiven);
System.out.println("Output(case sensitive) : " + Arrays.toString(strGiven));
}
}
Example 6: efficient way to sort an array in java
enum Code {
Str1(1), Str2(2), Str3(3), Str4(4), Str5(5));
int sortNumber;
Code(int sortNumber) {
this.sortNumber = sortNumber;
}
int returnNumber() {
return sortNumber;
}
};
public static void main(String[] args) {
List<Object> obj = new ArrayList<Object>();
Collections.sort(obj, new Comparator<Object>() {
@Override
public int compare(Object object1, Object object2) {
return Code.valueOf(object1.getStr()).returnNumber() > Code.valueOf(object2.getStr()).returnNumber() ? 1 : -1;
}
});
}