Java 38-988 practice

s1 and s2 refer to the same object in memory?

• True

• False

s2 and s3 refer to the same object in memory?

• True

• False

a different string can be assigned to s2 on line 05.

• True

• False

You work as a Java programmer.

You need to convert a numeric String to a primitive double value.

What code segment should you use?

• Double.valueOf(numberString);

• double.parseDouble(numberString);

• String.parseDouble(numberString);

• Double.parseDouble(numberString);

Which int data type would you use to store the numeric value 3,000,000,000 (3 billion) so that the least amount of memory is used.

• short

• byte

• long

• int

You need to evaluate the following code segment:

double dNum = 2.667;

int iNum = 0;

iNum = (int)dNum;

What happens when the code segment is run?

• iNum has a value of 0.

• An exception is thrown.

• iNum has a value of 2.

• iNum has a value of 3.

You are writing a Java method.

The program must meet the following requirements:

-> Accept a String parameter firstName

-> Display a welcome message that contains firstName

-> Ensure that the first letter of the name is capitalized, and the remaining letters are in lowercase

What would be the correct order for answers?

• charAt substring toLowerCase toUpperCase

• substring charAt toLowerCase toUpperCase

• substring charAt toUpperCase toLowerCase

• charAt substring toUpperCase toLowerCase

You work as a Java programmer.

You need to convert a numeric String to a primitive double value.

What code segment should you use?

• Double.valueOf(numberString);

• double.parseDouble(numberString);

• String.parseDouble(numberString);

• Double.parseDouble(numberString);

What is the answer for the first block

• ArrayList

• String

• String[]

What is the answer for the second block

• args[i]

• args[0]

• args.length

• args.length - 1

• args.length + 1