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Default array values in Java
Java provides a data structure, the array, which stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type. When an array is created without assigning it any elements, compiler assigns them the default value. Following are the examples:
- Boolean - false
- int - 0
- double - 0.0
- Object - null
Example
public class Tester {
public static void main(String[] args) {
System.out.print("Default values (String array):");
String strings[] = new String[5];
for (String s : strings) {
System.out.print(s + " ");
}
System.out.println();
System.out.print("Default values (int array):");
int numbers[] = new int[5];
for (int val : numbers) {
System.out.print(val + " ");
}
System.out.println();
System.out.print("Default values (double array):");
double doubles[] = new double[5];
for (double val : doubles) {
System.out.print(val + " ");
}
System.out.println();
System.out.print("Default values (boolean array):");
boolean booleans[] = new boolean[5];
for (boolean val : booleans) {
System.out.print(val + " ");
}
System.out.println();
System.out.print("Default values (Object array):");
Tester testers[] = new Tester[5];
for (Tester val : testers) {
System.out.print(val + " ");
}
}
}Output
Default values (String array):null null null null null Default values (int array):0 0 0 0 0 Default values (double array):0.0 0.0 0.0 0.0 0.0 Default values (boolean array):false false false false false Default values (Object array):null null null null null
Updated on: 21-Jun-2020
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