JAVA认证

Question: 14

Which one of the following arguments is the correct argument of the main() method?

A. char args[]

B. char args[][]

C. String arg[]

D. String args

Explanation:

The argument of the main() method is an array of String. Then only answer C is an array of String.

Correct Answer: C 14 of 60

Question: 15

Which one of the following is correct to create an array?

A. float f[][] = new float[6][6];

B. float []f[] = new float[6][6];

C. float f[][] = new float[][6];

D. float [][]f = new float[6][6];

E. float [][]f = new float[6][];

Explanation:

In Java the declaration format allows the square brackets to be at the left or right of the variable name. But the new float[][6] is illegal.

Correct Answer: A,B,D,E 15 of 60

Question: 16

Given the following expression: int m[] = {0, 1, 2, 3, 4, 5, 6 };

Which result of the following expressions equals to the number of the array elements?

A. m.length()

B. m.length

C. m.length()+1

D. m.length+1

Explanation:

The number of elements in an array is stored in the length attribute in the array object.

Correct Answer: B 16 of 60

Question: 17

Given the following command to run a correct class: java MyTest a b c

Which statements are true?

A. args[0] = MyTest a b c

B. args[0] = MyTest

C. args[0] = a

D. args[1]= 'b'

Explanation:

The three arguments a b c are stored in the args[] array of the main() method. Then args[0]= a, args[1]= b, args[2]= c.

Correct Answer: C 17 of 60

Question: 18

Given the following code:

public class Test{

long a[] = new long[10];

public static void main ( String arg[] ) {

System.out.println ( a[6] );

}

}

Which statement is true?

A. Output is null.

B. Output is 0.

C. When compile, some error will occur.

D. When running, some error will occur.

Explanation:

When an array is created the members of the array is initialized. In this case all the elements are initialized to be 0.

Correct Answer: B 18 of 60

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