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class MyString extends String {

}

The code compiles successfully.
The code does not compile because you have not defined a main() method.
The code does not compile because String is abstract.
The code does not compile because String is final

integer
double
float
default

public
protected
private
default

abstract class    
double   Boolean

class, double, Boolean
class, double
abstract, double, class
abstract, class, double, Boolean

class ClassA { 
  public static void main (String[] args) { 
    ClassB b = new ClassB(); 
  }
  ClassA (int i) { 

  } 
} 
class ClassB extends ClassA { 

}

The code does not compile because the ClassA class does not define a no-args constructor.
The code does not compile because the ClassB class does not define a no-args constructor.
The code does not compile because there is no code in the ClassA(int i).
The code compiles and runs successfully.

• the number of letters in the alphabet (26 letter)
• the net worth of Bill Gates in US dollars (40 billion)
• the number of pages in your textbook (600 pages)
• the number of people in the US (200 million)

a byte
a short
an int
a long

-2¹⁵ to 2¹⁵-1
-2^{(number of bits - 1)} to 2^{(number of bits - 1)}
-2³¹ to 2³¹
-2^{(number of bits - 1)} to 2^{(number of bits - 1)} - 1

class ClassA { 
  int instVar1 = 1;
  int instVar2; 
  public static void main(String[] args) { 
    int localVar3 = 3;
    System.out.println(instVar1 + instVar2 + localVar3); 
  } 
}

4
0
The code does not compile because localVar is not initialized correctly.
The code does not compile because instVar2 is not initialized at all.

boolean[] b = new boolean[3];
boolean[] b = {true, true, true};
boolean[3] b = {true, true, true};
boolean[] b = new boolean[3]; b = {true, true, true};

5 & 2 

0
2
5
7

10 | 2 

0
2
10
14

an integer
a boolean
either an integer or a boolean
none of the above

char c = 'a';
switch(c) { 
  case 'a': System.out.println("a"); break;
  default: System.out.println("default"); 
}

The code will not compile because the switch statement does not have a legal expression.
The code will compile and run but nothing will be written to the standard output.
The code will compile and run and the letter "a" will be written to the standard output.
The code will compile and run and the word "default" will be written to the standard output.

int myInt = 3;
if (myInt < 5)
  if (myInt < 3)
    System.println.out("< 3"); 
else 
  if (myInt > 2) 
    System.out.println("> 2"); 
else 
  System.out.println("other');

"< 3"
"> 2"
"other"
nothing

any line of code
only lines of code associated with a loop (just before, at the loop, just after)
only the line of code at the start of a loop
only the line of code defining the most outer loop

class A {
  public static void main(String[] args) { 
    try { 
      System.out.println("Hello!"); 
    } 
  } 
}

You cannot have a try block without a catch and/or finally
Code that does not throw an exception cannot be in a try block
The method main() must always throw something if the try block is used without a catch.

class Over {
  public static void main (String[] args) {
    Under u = new Under(); 
    u.test(); 
  } 
  int test() { 
    System.out.println("Over"); 
    return 1; 
  } 
}

class Under extends Over { 
  short test() { 
    super.test(); 
    System.out.println("Under"); 
    return 1; 
  } 
}

The code does not compile.
This code compiles and runs and displays Over followed by Under.
This code compiles and runs and displays Under followed by Over.

Math.method(x);

round()
ceil()
floor()
all of the above
round() and floor() only

String s = "Penguin";

char c = s.charAt(6)

'n'
'i'
Nothing will be assigned because charAt() will respond with a StringIndexOutOfBoundException

class Str { 
  public static void main(String[] args) { 
    String s = new String("HELLO"); 
    String t; t = s.toUpperCase(); 
    if (s == t) System.out.println("equals"); 
    else        System.out.println("not equals"); 
  } 
}

equals
not equals

class Str { 
  public static void main(String[] args) { 
    String s = new String("Hello"); 
    String t; t = s.toUpperCase(0; 
    if (s == t) System.out.println("equals"); 
    else        System.out.println("not equals"); 
  } 
}

equals
not equals

String s = "Hello"; 
String t = s; 
s += " world"; 
if (s == t) System.out.println("equals"); 
else        System.out.println("not equals"); 

equals
not equals

It is the only thread currently running.
It has been suspended.
It has been resumed.
It has been notified.
All of the above.

The thread with the normal priority will definitely not run until the thread with the maximum priority ends.
The thread with the normal priority will never run, even after the thread with the maximum priority ends.
Neither of the above is true.

Thread
Applet
Object
Runnable

When you first create a thread
At any time after you create a thread
All of the above

update()
paint()
init()
repaint()

Thread
Applet
Graphics
Component

component
target
evt
id

handleEvent()
action()
both handleEvent() and action()
neither of these

Event and Object
Event
Object
Component

false
true
null
0

public static void main(String args[]) { }
public static void main(String[]) { }
public static void main(String[] args)
public static void main(args)

java red blue green blue red

args[1]
args[3]
args[2]
args[4]
both args[1] and args[3]

String s = getName("lastname");
String s = parameter("lastname");
String s = getParameter("lastname");

The runtime would throw an exception
The parameter's value would be null
The parameter's value would be an empty string.

validate()
repaint()
layout()
update()

Clonable
Throwable
RemoteObject
Remote

not return a value
throw a RuntimeException
throw a RemoteException
be static methods

a stub representing the object
a copy of the object
a direct reference to the object
an instance of RemoteObject

a port number
an IP address
both a port number and an IP address
none of these

Socket
ServerSocket
Server
URL

Socket
ServerSocket
Server
URL

Java attempts to establish a connection over the Internet with the host.
Java starts a server running on the host.
Nothing special happens until you invoke the Socket's accept() method.

Identify a machine on the Internet based on the dotted octet or domain name
Ensure packets arrive in the same order they are sent
Both previous choices are correct
None of the above

class Animal { abstract void growl(); }

---

abstract Animal { abstract void growl(); }

---

class abstract Animal { abstract void growl(); }

---

abstract class Animal { abstract void growl(); }

---

abstract class Animal { abstract void growl() { System.out.println("growl"); } }

---

class Key { }

---

abstract final class Key { }

---

native class Key { }

---

class Key { final }

---

final class Key { }

---

class Tester {
  int var; 
  Tester (double var) { this.var = (int)var; } 
  Tester (int var) { this("hello"); } 
  Tester (String s) { this(); System.out.println(s); } 
  Tester () { System.out.println("good-bye"); } 
  public static void main(String[] args) {
    Tester t = new Tester(5); 
  }  
}

nothing
hello
5
hello followed by good-bye
good-bye followed by hello

class Riddle {
  public static void main(String[] args) {
    String first, second; String riddle; 
    if (args.length < 2) return; 

a:  first = new String(args[0]); 
b:  second = new String(args[1]); 
c:  riddle = "When is a " + first; 
d:  first = null; 
e:  riddle += " like a " + second + "?"; 
f:  second = null; 
  
g:  System.out.println(riddle); 

h:  args[0] = null; 
i:  args[1] = null; 

j: 

  }  
} 

d:
e:
h:
i:
j:

-2⁷ to 2⁷ - 1
0 to 2⁸
-2⁸ to 2⁸
-2⁷ to 2⁷ - 1
-(2⁸ - 1) to 2⁸

class Array {
  public static void main(String[] args) {
    int length = 100; 
    int[] d = new int[length]; 
    for (int index = 0; index < length; index++) 
      System.out.println(d[index]); 
  } 
}

The code will not compile because the int[] array is not declared correctly.
The code will compile but will throw an IndexArrayOutOfBoundsException when it runs and nothing will appear in the standard output
The code will display the numbers 0 through 99 in the standard output, and then throw an IndexOutOfBoundsException
The code will compile but the println() method will throw a NoSuchMethodException
This code will work fine and display 100 zeroes in the standard output.

class Superclass { }
class Subclass1 extends Superclass { }

Superclass a = new Superclass();
Subclass1 b = new Subclass1();

a = b

Illegal at compile time
Legal at compile time but possibly illegal at runtime
Definitely legal at runtime

outer: for (int x = 0; x < 3; x++) {
  middle: for (int y = 0; y < 3; y++) {
    inner: for (int z = 0; z < 3; z++) {
      if (arr(x, y, z) == targetValue) 
        break; 
    } 
  }  
}

break inner
break middle
break outer
continue
continue middle

class Superclass { }
class Subclass1 extends Superclass { }

Superclass a = new Superclass();
Subclass1 b = new Subclass1();

b = a;

Illegal at compile time
Legal at compile time but possibly illegal at runtime
Definitely legal at runtime

double a = 90.7;
double b = method(a);
System.out.println(b);

abs()
min()
floor()
round()
ceil()

(true & true)
(4 & 5)
(int myInt = 0 > 3)
float myFloat = 40.0;
boolean b = (boolean)99;

repaint()
update()
paint()
draw()
show()

TextField tf = new TextField(30);

This code is illegal, there is no such constructor for TextField
Creates a TextField object than can hold 30 rows, but since it is not initialized to anything, it will always be empty
Creates a TextField object that can hold 30 columns, but since it is not initialized to anything, it will always be empty
Creates a TextField object that can hold 30 rows of text
Creates a new TextField object that is 30 columns of text

Boolean b1 = new Boolean(true);
Boolean b2 = new Boolean(true);

b1 == b2
b1.equals(b2)
b1 & b2
b1 | b2
b1 && b2
b1 || b2

class Test {
  public static void main() {
    System.out.println("hello"); 
  } 
}

The program does not compile because main() is not defined correctly.
The program compiles but when you try to run the interpreter complains that it cannot find the main() method it needs to run
The program compiles but you cannot run it because the class is not declared as public
The program compiles and runs without an error but does not display anything in the standard output
The program compiles and displays hello in the standard output when you run it

passes that event up the container hierarchy
stops that event from being passed up the container hierarchy
has no effect on whether the event is passed up the container hierarchy

You can directly free memory allocated by an object
You can directly run the garbage collector whenever you want to
The garbage collector informs your object when it is about to be garbage collected
The garbage collector reclaims an object's memory as soon as it becomes a candidate for garbage collection
The garbage collector runs in low-memory situations

int
long
double
boolean
float

void main(String[] args) { }
static public void main(String args[]) { }
public static void main(String[] args) { }
public static int main(String[] args) { }
public static void main(String args[]) { }

int
float
char
boolean
Object

zero
instanceof
implements
NULL
sizeof
goto

String s = "Here's to you ";
String t = s + "Mrs. "; 
String t += "Robinson."; 

s = "Here's to you "
t = "Here's to you Mrs. Robinson."

---

s = "Here's to you Mrs. "
t = "Here's to you Mrs. Robinson."

---

s = "Here's to you Mrs. "
t = "Mrs. Robinson."

---

s = null
t = "Here's to you Mrs. Robinson."

---

s = null
t = "Robinson."

---

Object b1 = new Boolean(false); 
Object b2 = new Boolean(false); 
System.out.println(b1.equals(b2));

This code will not compile because you cannot assign a Boolean to an Object
This code will not compile because you cannot test for equality of two Boolean values using equals()
This code compiles and when it runs it displays the word true
This code compiles and when it runs it displays the word false
This code runs but throws NoSuchMethodException

String s = "Maybe "; 
s += " not"; 

s contains "Maybe  not" at the end.
This code produces a String object that becomes a candidate for garbage collection
Only one String object is created
This code produces an exception because a String object cannot be modified once it is created

Can remove all leading white space
Can remove all trailing white space
Can trim the String to a substring specified as a parameter
Can trim the String to start and end indexes specified as parameters

start()
runnable()
run()
init()
main()

-
+=
>>
&
none of the above