SINGLE-DIMENSIONAL ARRAYS - Introduction to Java Programming: Comprehensive Version - page 264

Stack Heap Stack Heap

Activation record for the
createArray method

Array of 100
characters

Array of 100
characters

char[] chars : ref

Activation record for the
main method

Activation record for the
main method
char[] chars : ref char[] chars : ref

(a) Executing
createArray in line 5

(b) After exiting
createArray in line 5

F IGURE 7.8

(a) An array of 100 characters is created when executing createArray .
(b) This array is returned and assigned to the variable chars in the main method.

7.16

✓ ✓

True or false? When an array is passed to a method, a new array is created and passed
to the method.

Check

Point

7.17

Show the output of the following two programs:

public class Test {
public static void main(String[] args) {
int number = 0 ;
int [] numbers = new int [ 1 ];

public class Test {
public static void main(String[] args) {
int [] list = { 1 , 2 , 3 , 4 , 5 };
reverse(list);
for ( int i = 0 ; i < list.length; i++)
System.out.print(list[i] + " " );
}

m(number, numbers);

System.out.println( "number is " + number
+ " and numbers[0] is " + numbers[ 0 ]);
}

public static void reverse( int [] list) {
int [] newList = new int [list.length];

public static void m( int x, int [] y) {
x = 3 ;
y[ 0 ] = 3 ;
}
}

for ( int i = 0 ; i < list.length; i++)
newList[i] = list[list.length - 1 - i];

list = newList;
}
}

(a) (b)

7.18

Where are the arrays stored during execution? Show the contents of the stack and
heap during and after executing displayArray , countLetters , displayCounts
in Listing 7.4.

7.9 Variable-Length Argument Lists
A variable number of arguments of the same type can be passed to a method and
treated as an array.

Key
Point

You can pass a variable number of arguments of the same type to a method. The parameter in
the method is declared as follows:

typeName... parameterName

In the method declaration, you specify the type followed by an ellipsis ( ... ). Only one
variable-length parameter may be specified in a method, and this parameter must be the last
parameter. Any regular parameters must precede it.