You can also do it as part of the declaration:
int[] a = new int[] {0, 0, 0, 0};
Arrays.fill()
. The method is overloaded for different data types, and there is even a variation that fills only a specified range of indices.
Arrays.fill(arrayName,value);
in java
int arrnum[] ={5,6,9,2,10};
for(int i=0;i<arrnum.length;i++){
System.out.println(arrnum[i]+" ");
}
Arrays.fill(arrnum,0);
for(int i=0;i<arrnum.length;i++){
System.out.println(arrnum[i]+" ");
}
Output
5 6 9 2 10
0 0 0 0 0
Check out the Arrays.fill methods.
int[] array = new int[4];
Arrays.fill(array, 0);
int[] a = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
Array elements in Java are initialized to default values when created. For numbers this means they are initialized to 0, for references they are null and for booleans they are false.
To fill the array with something else you can use Arrays.fill() or as part of the declaration
int[] a = new int[] {0, 0, 0, 0};
There are no shortcuts in Java to fill arrays with arithmetic series as in some scripting languages.
An array can be initialized by using the new Object {}
syntax.
For example, an array of String
can be declared by either:
String[] s = new String[] {"One", "Two", "Three"};
String[] s2 = {"One", "Two", "Three"};
Primitives can also be similarly initialized either by:
int[] i = new int[] {1, 2, 3};
int[] i2 = {1, 2, 3};
Or an array of some Object
:
Point[] p = new Point[] {new Point(1, 1), new Point(2, 2)};
All the details about arrays in Java is written out in Chapter 10: Arrays in The Java Language Specifications, Third Edition.
In Java-8 you can use IntStream
to produce a stream of numbers that you want to repeat, and then convert it to array. This approach produces an expression suitable for use in an initializer:
int[] data = IntStream.generate(() -> value).limit(size).toArray();
Above, size
and value
are expressions that produce the number of items that you want tot repeat and the value being repeated.
Source: Stackoverflow.com