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Assume n1, n2 and n3 are three declared and initialized real numbers in a JAVA program. The execution of the statement int result = (int) n1 * n2 * n3; will

compute their product and store its value in the variable result.

❌

compute the product of the floor of n1 by n2 and n3 and store its value in the variable result.

❌

compute the product of n1, n2 and n3, round down its value and store it in the variable result.

❌

generate a compile-time error.

✅

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Which of the below statements is(are) false?

The JAVA compiler is capable of detecting and identifying all kinds of errors in a program.

✅

In JAVA, floating point literals are, by default, assumed to be of type float.

❌

In JAVA, the identifier Public is a reserved word.

❌

In JAVA, a division by zero is considered to be a syntax error identified at compile time.

✅

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Which of the below enumerated types is not a primitive data type?

Double

short

boolean

int

Among the below identifiers, select the ones that can be used to name variables in JAVA:

static

public

3rdGrade

void

All4_one

If x is a short variable and y is a long one, all of the following are legal JAVA statements except:

y = x;

❌

x = y;

✅

y = (long) x;

❌

None of the other listed assignment statements is valid.

❌

All other listed assignment statements are valid.

❌

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Among the below statements, select the ones that are true:

All classes contained in the java.lang package must be explicitly imported in every JAVA program.

❌

next() is a method of the Scanner class that allows accepting an integer as an input.

❌

"a", in JAVA, is a literal value of type char.

❌

None of the other statements is true.

✅

All other statements are true.

❌

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A JAVA program must have at least one

class definition.

variable.

comment line.

output statement.

Assume that s1 and s2 are two String objects. Which of the below JAVA statements can be used to print out to the screen the first letter of s1 followed by the last two characters of s2?

s1.charAt(0) + s2.substring(s2.length() - 2, s2.length() - 1);

❌

System.out.print(s1.charAt(1) + s2.substring(s2.length() - 1, s2.length()));

❌

System.out.println("s1.charAt(0)" + "s2.substring(s2.length() - 2, s2.length())");

❌

System.out.println(s1.charAt(0) + s2.substring(s2.length() - 2, s2.length()));

✅

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In JAVA, the term instantiation means:

Indicating the first time an object is being used.

❌

Creating a new class.

❌

Creating a new alias to an existing object.

❌

Creating a new object.

✅

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Consider the below JAVA code snippet that assumes x and y are pre-declared and initialized integer variables:

if (x > y)
{
     int t = x;
     x = y;
     y = t;
}

The execution of the above code snippet shall:

swap the values of x and y.

❌

store the smaller value in y and the larger value in x.

❌

store the smaller value in x and the larger value in y.

✅

do none of the actions described in the other listed choices.

❌

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