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Lessons Java Arrays vs C++ Arrays Bookmark and Share
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Generally speaking, there is not much difference between the Java and C or C++ arrays. As a C / C++ programmer you will find it very easy to understand and work with arrays in Java.

In C++, when we declare an array, storage for the array is allocated. In Java, when we declare an array, we really only declare a pointer or reference to an array; storage for the array itself is not allocated until we use the "new" keyword. This difference is elaborated below:

C++

int A[10]; // A is an array of length 10
A[0] = 5; // set the 1st element of array A

JAVA
int [ ] A; // A is a reference / pointer to an array

A = new int [10]; // now A points to an array of length 10

A[0] = 5; // set the 1st element of the array pointed to by A


In both C++ and Java we can initialize an array using values in curly braces. Here's the example

Java code:

int [ ] myArray = {13, 12, 11}; // myArray points to an array of length 3

// containing the values 13, 12, and 11

In Java, a default initial value is assigned to each element of a newly allocated array if no initial value is specified. The default value depends on the type of the array element as shown below:

Type Value
boolean false
char '\u0000'
byte, int, short, long, float, double 0
any reference type e.g. a class object null

In Java, array bounds are checked and an out-of-bounds array index always causes a runtime error.
Next >>> Lesson No. 5: Arrays Operations In Java







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