Java Basics Quiz 4 | Java Basics Question and Answers | JAVA Test

public static void main(String args[]){ System.out.println(this); }

What gets the memory first? static variable or static method?

unary operator have right to left associativity is this______ .

&& have higer precedence than &.

An object that is not referred by any reference variable, is known as annonymous object.

There is naming convention that variable name must be start with capital letter this is____.

Can you save the java source file without any name?

Is JRE is smaller than JDK?

class S{ int x=0; S(){ x++; } public static void main(String args[]){ S s=new S(); System.out.println(s.x); } }

We can invoke any number of methods by one instance only.

A top level class may have only the following access modifier. Select the one correct answer.

What is the number of bytes used by Java primitive long. Select the one correct answer.

Assume that File is an abstract class and has toFile() method. ImageFile and BinaryFile are concrete classes of the abstract class File.
Also, assume that the method toFile() is implemented in both Binary File and Image File. A File references an ImageFile object in memory and the toFile method is called, which implementation method will be called?

Which of the following are Java keywords. Select the four correct answers.
a. super
b. strictfp
c. void
d. synchronize
e. instanceof

What gets printed when the following program is compiled and run? Select the one correct answer.
class xyz {
static int i;
public static void main(String args[]) {
while (i < 0) {
i–;
}
System.out.println(i);
}
}

Which of these are interfaces in the collection framework. Select the two correct answers.
a. HashMap
b. ArrayList
c. Collection
d. SortedMap
e. TreeMap

What happens when the following code is compiled and run. Select the one correct answer.

for(int i = 1; i < 4; i++)
for(int j = 1; j < 4; j++)
if(i < j)
assert i!=j : i;

What gets printed on the standard output when the class below is compiled and executed. Select the one correct answer.

public class ShortCkt {
public static void main(String args[])               {
int i = 0;
boolean t = true;
boolean f = false, b;
b = (t || ((i++) == 0));
b = (f || ((i+=2) > 0));
System.out.println(i);
}
}

What gets printed when the following program is compiled and run. Select the one correct answer.

class test {
public static void main(String args[]) {
int i,j,k,l=0;
k = l++;
j = ++k;
i = j++;
System.out.println(i);
}
}

Write down the modifier of a method that makes the method available to all classes in the same package and to all the subclasses of this class.