how to declare array java
int intArray[]; //declaring array
intArray = new int[20]; // allocating memory to array
//OR
int[] intArray = new int[20]; // combining both statements in onehow to declare array java
int intArray[]; //declaring array
intArray = new int[20]; // allocating memory to array
//OR
int[] intArray = new int[20]; // combining both statements in onehow 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; // Declare an int array named marks
// marks contains a special value called null.
int marks[]; // Same as above, but the above syntax recommended
marks = new int[5]; // Allocate 5 elements via the "new" operator
// Declare and allocate a 20-element array in one statement via "new" operator
int[] factors = new int[20];
// Declare, allocate a 6-element array thru initialization
int[] numbers = {11, 22, 33, 44, 55, 66}; // size of array deduced from the number of itemsarray in java
//method 1
int[] age = new int[3];
age[0] = 1;
age[1] = 3;
age[2] = 6;
for (int i=0; i < 3; i++)
System.out.println(age[i]);
//method 2
int[] num = {3,3,5};
//int num[] = {3,3,5}; also works the same
System.out.println(num[0]);Java loop array
Scanner scanner = new Scanner( System.in );
int n = scanner.nextInt();
int[] a=new int[ n + 1 ];
for( int k = 1; k <= n; k ++ ){
a[ k ] = scanner.nextInt();
}
Arrays.sort( a );
for( int k = 1; k <= n; k ++ ){
System.out.print( a[k] + " " );
}java array loop
public class Test {
public static void main(String args[]) {
String string = args[0];
System.out.println("last character: " +
string.substring(string.length() - 1));
}
}how to use for loop for array in java
// Java program to iterate over an array
// using for loop
import java.io.*;
class GFG {
public static void main(String args[]) throws IOException
{
int ar[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
int i, x;
// iterating over an array
for (i = 0; i < ar.length; i++) {
// accessing each element of array
x = ar[i];
System.out.print(x + " ");
}
}
}Copyright © 2021 Codeinu
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