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Array of Ref Test

Last updated about 2 years ago

12 Nsɛmmisa

5

5

5

5

5

5

5

5

5

5

Asemmisa {{asɛmmisaAhyɛnsode}}

1.

What is output by the code below?
`String[] ray;`
`ray = new String[4];`
`System.out.println( ray[0] );`

one

two

three

null

0

Asemmisa {{asɛmmisaAhyɛnsode}}

2.

What is output by the code below?
`Integer[] ray;`
`ray = new Integer[4];`
`System.out.println( ray[3] );`

0

1

2

3

null

Asemmisa {{asɛmmisaAhyɛnsode}}

3.

What is output by the code below?
`Integer[] ray;`
`ray = new Integer[4];`
`ray[1] = null;`
`ray[0] = new Integer(3);`
`ray[2] = new Integer(99);`
`System.out.println( ray[2] );`

4

3

99

null

0

Asemmisa {{asɛmmisaAhyɛnsode}}

4.

What is output by the code below?
`Integer[] ray = {11,55,-4,909};`
`System.out.println( ray[3] );`

11

55

-4

909

0

Asemmisa {{asɛmmisaAhyɛnsode}}

5.

What is output by the code below?
`Double[] ray = {11.2,55.0,-4.5,909.0};`
`System.out.println( ray[1] );`

11.2

55.0

-4.5

909.0

0

Asemmisa {{asɛmmisaAhyɛnsode}}

6.

What is output by the code below?
`Double[] ray = {11.2,7.2,-4.5,909.0};`
`ray[1] = new Double(55.0);`
`System.out.println( ray[1] );`

11.2

55.0

-4.5

909.0

0

Asemmisa {{asɛmmisaAhyɛnsode}}

7.

What is output by the code below?
`Double[] ray = {3.2,5.7,6.3,1.9};`
`double x = 0;`
`for( double r : ray )`
`x += r;`
`System.out.println( x );`

16.8

17.2

17.4

17.1

16.4

Asemmisa {{asɛmmisaAhyɛnsode}}

8.

What is output by the code below?
`Double[] ray = {3.1,5.2,6.3,1.4};`
`for( double r : ray )`
`r = 0;`
`System.out.println( ray[2] );`

3.1

5.2

6.3

1.4

0.0

Asemmisa {{asɛmmisaAhyɛnsode}}

9.

What is output by the code below?
`String[] ray;`
`ray = new String[4];`
`ray[1] = "one";`
`System.out.println( ray[1] );`

one

two

three

null

0

Asemmisa {{asɛmmisaAhyɛnsode}}

10.

What is output by the code below?
`String[] ray;`
`ray = new String[4];`
`ray[1] = "one";`
`ray[2] = "two";`
`ray[3] = "three";`
`System.out.println( ray[0] );`

one

two

three

null

0

25

Asemmisa {{asɛmmisaAhyɛnsode}}

11.

Part A. Write the `Group` method `howManyWithXVowels()`, as started below. `howManyWithXVowels` will receive an integer and determine if each word has more than that number of vowels.
If the list is `["about","dogs","123456","A"]`
The call `howManyWithXVowels( 1 )` would return `3`
The call `howManyWithXVowels( 3 )` would return `1`
/**
Method howManyWithXVowels will return the number
of Words with at least x vowels
*/
`public int howManyWithXVowels( int x )`
`{`
`//Code goes here//`
`}`

25

Asemmisa {{asɛmmisaAhyɛnsode}}

12.

Part B. Write the `Group` method `getTotalDigitCount( )`, as started below. `getTotalDigitCount( )` will return the total number of digits in all of the words in the list.
If the list is `["abou7","dogs","123456","A","34Funny"]`
The call `getTotalDigitCount( )` would return `9`
/*
Method getTotalDigitCount will return the count
Of the number of digits in all of the words in stuff
*/
`public int getTotalDigitCount( )`
`{`
`//Code goes here//`
`}`