SE101

Each java statement must end with a semicolon. True. False.

A variable is a name associated with a particular memory location. True. False.

In Java programming language, the variables X and x are identical. True. False.

The computer prints the text after // on the console when the program is executed. True. False.

Scanner class is imported by default for reading input from the console. True. False.

The data supplied via the Scanner object is stored in the hard disk of the computer. True. False.

"\n" positions the screen cursor to the beginning of the current line. True. False.

$4 is a valid identifier (name) for a variable, method or class in Java. True. False.

Two variables of the same type can be declared in one statement in a java program. True. False.

System.out.println(1 / 2); prints 0.5. True. False.

System.out.println(1 % 2); prints 1. True. False.

System.out.println("1.0 / 3.0 is " + 1.0 / 3.0); prints 1.0 / 3.0 is 0.33333333. True. False.

System.out.println("1.0 / 3.0 is " + 1.0 + 3.0); prints 1.0 / 3.0 is 1.03.0. True. False.

A floating-point literal (value) is assumed to be of type float. True. False.

The currentTimeMillis method in the DateTime class returns the current time in milliseconds elapsed since the time midnight, January 1, 1970 GMT. True. False.

The relational (comparison) operators have higher precedence than arithmetic operators. True. False.

The expression: x = x + 1; is equivalent to this expression: x++;. True. False.

The arithmetic operators +, -, *, / and % have the same level of precedence. True. False.

Both statements x++ and ++x have the same effect in a mixed arithmetic expression. True. False.

The associatively of the assignment and augmented assignment operators is from left to right. True. False.

Casting is necessary if you are assigning a value to a variable of a larger type range. True. False.

double x = 1.0 - 0.1 - 0.1 - 0.1 - 0.1 - 0.1; System.out.println(x == 0.5); prints false. True. False.

If(number % 2 == 0 ^ number % 3 == 0) checks whether number is divisible by both 2 or 3. True. False.

The statements following else in an if-else are executed when the condition of if is false. True. False.

The default keyword in the switch statement structure is mandatory. True. False.

All the binary operators except assignment and augmented assignment are left associative. True. False.

Math.PI and Math.E are two useful float constants provided by Math class. True. False.

Math.floor(−2.1) returns -2.0. True. False.

Math.ceil(−2.1) returns −2.0. True. False.

The expression: 50 + (int)(Math.random()*50) returns a random integer between 50 and 99. True. False.

You cannot use == operator to check whether two string variables have the same contents. True. False.

if(x%2 == 0); System.out.println("even"); prints the word "even" for any value of variable x. True. False.

int i = 0; while (i < 10) System.out.print(i); i++; prints 0123456789. True. False.

The break statement inside a loop causes loop to exit. True. False.

int i = 0; while (i < 10) { System.out.print(i); i--; } prints the value of variable i infinitely. True. False.

The code: for( ; ; ) is equivalent to this code: while(true) which imply to infinite loop. True. False.

The initialize expression and increment/decrement expression are optional in the for loop. True. False.

The code: for(int i = 0 ; i < 10 ; i++) is not equivalent to this code: for(int i = 0 ; i < 10 ; ++i). True. False.

The code: int i = 0; do {System.out.print(i); i++;} while(i<10) has a syntax error. True. False.

Using floating-point numbers in the loop continuation condition may cause numeric errors. True. False.

The body of do/while loop is executed zero or more times. True. False.

A value-returning method can also be invoked where caller ignores its return value. True. False.

When a variable is passed to a method, it is passed by value to this method. True. False.

A return statement can also be used for terminating a void method. True. False.

The passed argument to a method may have the same name as its corresponding parameter declared in the method's signature. True. False.

If two methods have the same name but different return types within one class, then they are overloaded methods. True. False.

The scope of a variable is the part of the program where the variable can be referenced. True. False.

A variable can be declared multiple times in nested blocks. True. False.

for (int i = 0 ; i < 10 ; i++) {} System.out.println(i); prints 10. True. False.

int[] refVar; allocates space in memory for an array and assigns its reference to refVar. True. False.

double[] myList = {1.9, 2.9, 3.4}; creates an array and also fills in its with initial values. True. False.

An array can store many values of different types. True. False.

An array size is fixed after an array reference variable is declared. True. False.

The elements in an array must be of a primitive data type. True. False.

int[] list={10,20}; for(int i=0; i<list.length(); i++) System.out.println(list[i]); is correct code. True. False.

To copy an array named arr1 into an array of the same size named arr2, just write: arr2=arr1;. True. False.

When passing an array to a method, just the reference of the array is passed to the method. True. False.

When a method returns an array, the array itself is returned to the caller. True. False.

public static void print(int n , int... numbers) is valid header for a method. True. False.

double[][] myList = {{1.9, 2.9}, {5.7}}; is valid syntax to create and initialize a ragged array. True. False.

The rows in a two-dimensional array may have different lengths. True. False.

The numbers of rows and columns in a two-dimensional array must be equal. True. False.

N nested for loops are often used to process N-dimensional array. True. False.

It is not necessary that a Java program contain a main class. True. False.

Each class in the source code is written into a .class file. True. False.

The .class file is compiled into .java file. True. False.

The System class is imported by default in any java program because it is in ……… package. java.lang. java.util. java.math. javafx.geometry.

………. is a correct comment form. */…/*. */*…*/*. ///…/. {…}.

The ……… package is imported by default in any java project. java.lang. java.util. java.math. javafx.geometry.

An identifier (name) for a variable, method or class must not start with ……….. _ (Underscore). $ (dollar Sign). letter. digit (0…9).

.......... is not a correct variable type. float. short. byte. real.

To declare a named value as constant, you must use the keyword ……… before its name. const. final. static. abstract.

........ is numeric data type of two-bytes width for storing integers. byte. short. int. long.

An integer literal (value) is assumed to be of the ……… type. byte. short. int. long.

………. is the escape character used for printing TAB on the console. 't'. 'T'. '\t'. '\T'.

double a = 6.5; System.out.println(a += ++a); prints ……. 13. 14. 15. 16.

The value of variable x after executing the following statement is ……….. int x = 3 * 4 – 2 * ( ( 2 + 10 ) / 2 ) – 2;. 58. -2. 40. -12.

int x = 2; System.out.println(++x + 13 + x++); prints ……….. 17. 20. 16. 19.

int sum = 0; sum += 4.5; sum += 4.5; prints ……. 9.0. 9. 8.0. 8.

The following expression: a = b += c = d is equivalent to: ………. a = (b += (c = d)). a = ((b += c) = d). ((a = b) += c) = d. (a = b) += (c = d).

The ………. follows the case keyword in the switch statement. ; (Semicolon). – (Dash). : (Colon). \n (Newline).

The syntax: ………. is required to end each case in the switch statement structure. end;. break;. stop;. return;.

Math.rint(−2.5) returns ……….. -2. -2.0. -3. -3.0.

To get random lowercase letter in the ASCII range 97-122, you must use this expression: ………. (char)(((int)(97 + Math.random())) * 26). (char)(97 + ((int)(Math.random())) * 26). (char)(97 + (int)(Math.random() * 26)). (char)(97 + (int)(Math.random() * 25)).

Class ……… is responsible for storing and handling text data. String. Scanner. Math. System.

"abc".compareTo("abg") returns ……….. 4. -4. 4.0. -4.0.

To extract the substring "to" from String msg = "Welcome to Java"; you must write: ……….. msg.substring(7, 9). msg.substring(7, 10). msg.substring(8, 9). msg.substring(8, 10).

"Welcome to Java".indexOf('o',5); returns ……….. 4. 5. 9. 10.

"Welcome to Java".lastIndexOf("Java",5); returns ……….. 11. 12. 0. -1.

int i = 1; while (i < 10); System.out.print(i); prints ………. nothing. 1. 123456789. 10.

int i = 1; do {System.out.print(i); i++;} while(i>10); prints ………. nothing. 1. 123456789. 10.

The final value of variable x after running the following code is ……….. int x; for (x = -5 ; x < 6 ; x += 3) {}. 7. 6. 5. 4.

The while loop is guaranteed to execute ………. time(s). 0. 1. 2. Infinitely.

int i = 1; while(i < 10) if(i%2 != 0) continue; System.out.print(i); i++; prints ………. nothing. 1. 2468. 10.

String[] strArray = {"hany","ali"}; System.out.print(strArray); prints ………. hany. hanyali. address of the array in the heap stored in strArray variable. will not compile because of syntax error.

char[] city = {'D', 'a', 'l', 'l', 'a', 's'}; System.out.print(city); prints ………. D. Dallas. address of the array in the heap stored in strArray variable. will not compile because of syntax error.

int[] list={1,2,3}; for(int i=0; i<list.length-1; i++) System.out.print(list[i]+" "); has ……… error. syntax. runtime. logic. no.

The index number of the last element of an array with 30 elements is ………. system-defined. programmer-defined. 30. 29.

int[] list={1,2,3}; for(int i=0; i<list.length(); i++) System.out.print(list[i]+" "); has ……… error. syntax. runtime. logic. no.

The syntax: ………. correctly declares an array called x. int[] x;. array[] x;. int{} x;. array{} x;.

An integral literal (value) is assumed to be of type int. True. False.

String is a built-in primitive type. True. False.

A variable of reference type is initialized by default to the zero value. True. False.

A real floating-point literal (value) is assumed to be of the ……… type. float. double. decimal. real.