Java Quizzes

Q. What will be the output
boolean b;
int d, as=290;
int x1=100, x2=200, x3=300 ;
b=x1*2==x3
System.out.println(“B=”+ b);
b=(x3-2*x2<0)||((x3=400)<2*x2)
System.out.println(“B=”+ b);
d= as-++x1>x2? x1:x2
System.out.println(“D=”+ d);

Find the Output
int i=15, j=7;
System.out.println(i- – & – -j);
System.out.println(++i | ++j);

Find Output
int i=10;
int n=i++%5
System.out.println(“i= ” + i );
i%=n+1;
System.out.println(“n= ” + n );

Find Output
int k,j;
j=10;
for(k=1;k<=5;++k)
{
System.out.println(j);
j+=5;
}

Find Output
int m=100;
while(m>0)
{
if (m<10)
break;
m=m-10;
}
System.out.println(“m is “+m);

Find the Output
int f =1,i=2;
while (++i <5)
f *=i;
System.out.println(f);

Find the Output
int a = 5, b = 1, k = 9 ;
while( k > 1)
{
System.out.println (a);
System.out.println (b);
a = a – b ;
b = b + 2;
if (a == b)
{
k = 9 ;
}
else
{
k = k – 3;
}
}

Find Output
int s = 14 ;
if (s < 20 ) System . out . print ( “Under“ ) ; else System . out . print ( “Over“ ) ; System . out . println ( “the limit“ ) ;

Find Output
int i = 3 , n = 0 ;
while ( i < 4 )
{
n++;
i- -;
}
System.out.println (n) ;

Find Output
int val=100 , res, n=1000;
res=n+Val>1750? 400:200;
System.out.println(res);

Find Output
int cnt=8,num=4;
cnt- -;
num++;
System.out.println(“”+cnt+”,”+num);
– -cnt;
++num;
System.out.println(“”+cnt+”,”+num);
num=num++ + – -cnt;
System.out.println(“”+cnt+”,”+num);

Find Output
int x=2;
int y=++x;
System.out.print(x);
System.out.print(y);
System.out.print(x++);

Find Output
int x=1;
int y=x++;
System.out.print(x++);
System.out.print(y+x);
System.out.print(++y);

Find Output
int varl=10, var2=20;
for (int i=1; i<=2; i++) { System.out.print(varl++ +"\t" + --var2 +"\n"); System.out.print(var2-- +"\t" + ++varl +"\n"); }

int i, j, k;
for(i=1; i<=4; ++i) { for(k=1,j=i;k<=i; k++, j+=2) System.out.print(" "+j); System.out.println(""); }

What will be the value of sum
double i,sum=2;
for(i=3;i<8;++i)
{
if(i%4==0)
{
break;
sum=Math.pow(sum,i);
}
else
sum+=i/2;
}

Find Output
String st=”New to Information Technology”;
System.out.println(st.replace(“Technology”,”Practices”));
System.out.println(st.substring(7));

Find Output
int x = 10;
int y = 20;
if (( x < y ) || (x = = 5) > 10)
System.out.println(x);
else
System.out.println(y);

Find Output
int I=0;
label :
while(I<2)
{
System.out.print("I is " +I);
I++;
continue label;
}

Find Output
int f=1,i=2;
do
{
f*=i;
} while(++i <5);
System.out.println(f);

How many times does the following loop execute?
for(int i=1;i<=5;i++) { System.out.println(i); }

Find Output
double Number = 7583241;
int First = 0, Second = 0, R;
do
{
R = Number % 10;
if ( R % 2 == 0 )
First += R;
else
Second += R;
Number = Number / 10;
} while (Number > 0);
System.out.print(First – Second );

What will be the output of following statement
(a>=b)||(!(c==b) && (c<a) when where a=10,b=5,c=11

Find Output
y-x<500?150:50 //when x=300 and y=700

Find Output
int i=10,j,k,l,m,n;
j=i+5;
k=i+j/5;
l=k+1;
m=l+1-i;
n=k+m*l;
System.out.print(i+”\n”+k+”\n”+l+”\n”+m+”\n”+n);

Find Output
(x>=y) || (!(z==y) && (z<x)) //if x=10 , y=5, z=11

Find Output
int z,x=3,y=2;
z = –x + y++;
System.out.println(z);

Find Output
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)
{
display(11, 19 );
}
void display(int i, int j )
{
System.out.println(i >> j);
System.out.println(i << j);
}

Find Output
public static void main(String[] args) {

manipulate(11 );
}
static void manipulate(int i)
{
int n=i*5;
System.out.println(“i= ” + i%i++ );
i%=–n+1;
System.out.println(“n= ” + n );
}

Find Output
int a=10,b;
b=a++ + ++a;
System.out.print(a);
System.out.print(a++);
System.out.print(a);
System.out.print(++a);

Find Output
int x=5,y=5;
System.out.print(x++);
System.out.print(“,”);
System.out.print(++x);
System.out.print(“,”);
System.out.print(y++);
System.out.print(“,”);
System.out.print(++y);
System.out.print(“,”);

Find Output
int res,val=2000,n=1000;
res=n+val>1750?400:200;
System.out.print(res);

Find Output if j=5
(5*++j)%6

Find Output
int x=2;
int y=++x;
System.out.print(x);
System.out.print(y);
System.out.print(x++);

Find Output
int x=1;
int y=x++;
System.out.print(x++);
System.out.print(y+x);
System.out.print(++y);

Find Output if a,b,c are integers and d,f are floating point?
f=a+b/a; // a=5,b=3,d=1.5

Find Output
int cnt=8,num=4;
cnt–;
num++;
System.out.println(“”+cnt+”,”+num);
–cnt;
++num;
System.out.println(“”+cnt+”,”+num);
num=num+++–cnt;
System.out.println(“”+cnt+”,”+num);

Find Output
int a,mb=2,k=4;
a=mb*3/4+k/4+8-mb+5/8;
System.out.println(a);

Find Output
int g=3 ;
–g ;
g = g+2;
System.out.println(“The value is” + g);

What will be the value of x if j=5
x= (5 * ++j )/6;

Find Output
a=8;
b=5;
System.out.println(a&b);

Find Output
int i=0;
for (i=0 ; i<20 ; i++)
{
System.out.println (i);
i+=2;
}

Find Output
int i=10, j=10, a=60, b=70;
if ( a<100 )
{
if ( b<50)
++i;
a+=10;
}
else
++j;
a+=30;
System.out.println ("i =" + i) ;
System.out.println ("j =" + j) ;
System.out.println ("a =" + a) ;

What will be the output if opn=a
switch(opn)
{
case ‘a’ : jLabel1.setText(“Platform Independent”); break;
case ‘b’ :jLabel1.setText(“Object Oriented”);
case ‘c’ : jLabel1.setText(“Secure and safe”);break;
}

What will be the output if ch=b
switch (ch)
{
case ‘a’:System.out println(“it is a”);
case ‘b’ :System.out println(“it is b”);
case ‘c’ :System.out println(“it is c”);break;
case ‘d’ :System.out println(“it is d”);break;
default:System.out.println (“Not a b c d”);
}

What will be the value of j=–k+2* k+(++k) if k is 20 initially?

What will be the value of P=P*++j where J is 22 and p=3 initially?

Find Output
for (int i = 0 ; i < 5 ; i++) { System.out.println(++i); break; }

Find Output
int a=10;
int b=12;
int x=5;
int y=6;
while (a<=b) { if (a%2= =0) x=x + y; else x=x-y; a=a+1; } System.out.println(x);

Find Value of Sum
double i,sum=2;
for(i=3;i<8;++i)
{
if(i%4= =0)
{
break;
sum=Math.pow(sum,i);
}
else
sum+=i/2;
}
System.out.println(sum);

Which of these keywords is used to make a class?

Which of the following is a valid declaration of an object of class Box?

Which of these statement is incorrect?

What is the output of this program?
class main_class {
public static void main(String args[])
{
int x = 9;
if (x == 9) {
int x = 8;
System.out.println(x);
}
}
}

Which of the following statements is correct?

What is the output of this program?
class box {
int width;
int height;
int length;
}
class mainclass {
public static void main(String args[])
{
box obj = new box();
obj.width = 10;
obj.height = 2;
obj.length = 10;
int y = obj.width * obj.height * obj.length;
System.out.print(y);
}
}

A class can have many methods with the same name as long as the number of parameters or type of parameters is different. This OOP concept is known as

A constructor

What is byte code in the context of Java?

What is the return type of Constructors?

Which keyword is used by method to refer to the object that invoked it?

Which of the following is a method having same name as that of its class?

What is the output of this program?
class box {
int width;
int height;
int length;
int volume;
box() {
width = 5;
height = 5;
length = 6;
}
void volume() {
volume = width*height*length;
}
}
class constructor_output {
public static void main(String args[])
{
box obj = new box();
obj.volume();
System.out.println(obj.volume);
}
}

Which of the folowing stements are incorrect?

Which of the following may be part of class defination?

classes are useful because they?

A constructor is a special type of_____

A default constructor ______

o specify default access to a variable or a method ___ keyword is used

Inheritance means______

To inherit from class ___ keyword is used.

Java does not support ____ inheritance

When class is declared as abstract , then ____

When a class is declared as final , then ____

Overloaded methods ____