JAVA NET BEANS -call for classes: 9717570033: August 2012

Identify the possible error(s) in the following code fragment: Underline error(s) and

correct the code.

f=1;

for(int a=40; (>30); a)

f*=a;

s=0;

for(int a=1; a<40/a++)

s+=a;

Ans: Error in the first and second for loop line ,and the corrected code should be as follows:

for ( int a =40 ; (a >30); a )

for ( int a =1 ; (a <40); a ++ )

Find the output of the following code:

(a) int I =1;

while(I<5) {

System.out.print( I+ “ ” );

I=1*2;

}

(b) int total=0,sum=0;

for(int I=0;I>=10;I++)

sum += I;

System.out.println(total);

while(I<10) {

if( I % 2 ) = = 0)

{

x = x+ I:

System.out.print(x + “ ” );

}I++;}

(d) int I =0;

for(I=1;I<=20;I++){

System.out.print(i + “ ” );

I =I+2:

}

Ans: a) 1 2 4 b) 0 c) 0 2 6 12 20 d) 1 4 7 10 13 16 19

e) int I =0,x = 0:

do{

if (I% 5 = = 0){

x ++:

System.out.print(x + “ ” );

}

++i:

}

while(I<20);

System.out.print(“\n + x );

Ans:1

2 3 4

f) int I =0,x = 0;

for (I=0;I<5;++I)

for (I=0;j<i;j++) {

x += (I+j1);

System.out.print(i + “ ” );}

System.out.print(“\n +x );}

Ans:0

1 3 5 8 12 15 19 24 30

g) int I =0,x = 0;

for (I=1;I<10;I* = 2){

x ++:

System.out.print( x + “ ” );

}

System.out.print( “\n” + x);

Ans: 1 2 3 4

Rewrite the following fragment using switch:

if ( ch == ‘E’)

eastern ++;

if ( ch == ‘W’)

western ++;

if (ch ==’N’)

northern++;

if (ch == ‘S’)

southern++;

else

unknown++;

Ans: switch(ch) {

case ‘E’ : eastern ++; break;

case ‘W’ : western ++; break;

case ‘N’ : northern ++; break;

case ‘S’ : southern ++; break;

default : unknown++;}

Given the code fragment:

i = 2;

do { System.out.println(i);

i+=2;

}while(i<51);

jOptionPane.showMessageDialog(null, “Thank you”);

Rewrite the above code using a while loop.

Ans: i = 2;

while(i<51) { System.out.println(i);

i+=2;

}

jOptionPane.showMessageDialog(null, “Thank you”);

Rewrite following while loop into a for loop

int stripes = 0;

while ( stripes <=13) {

if ( stripes % 2 == 2)

{ System.out.println(“Colours code Red”);

}

else { System.out.println(“Colours code Blue”);

}

System.out.println(“New Stripe”);

stripes = stripes + 1;

}

Ans: for ( int stripes =0; stripes <=13; stripes++)

{ if stripes % 2 == 2)

{ System.out.println(“Colours code Red”);

}

else { System.out.println(“Colours code Blue”);

}

System.out.println(“New Stripe”);

}

Predict the output of the following code fragments.

(a) float x =9;

float y = 5;

int z = (int) (x/y);

switch (z) {

case 1: x= x + 2;

case 2: x= x + 3;

default : x = x+1;

}System.out.println(“Value of x :” + x);

(b) int i,j,n;

n=0, i= 1;

do {

n++; i++;

} while(i<=5);

while (i<4) {

for (j=1; j<=i; j++) {

n +=1;

}i = i + 1;

} System.out.println(n);

(d) int j=1, s=0;

while(j<10) {

System.out.println(J+ “+”);

s = s +j;

j = j + j % 3;

} System.out.println(“=” + s);

Ans: a) x = 15, b) No output c) 6 d) 1+2+4+5+7+8= 27

Find the output:

a)int f=1,i=2;

{

f*=i;

} while(++I <5);

System.out.println(f);

b) int I=0;

label :

if(I<2)

{

system.out.print(“I is “ +I);

I++;

continue label;

} 2

What will be the output the following code fragment if the value of ch is

(i) a (ii) c (iii) d (iv) 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 ,and d.”);}

What will be the output of the following code snippet?

int x= 10;

int y = 20;

if ((x<y)||(x=5) > 10)

System.out.println(x);

else

System.out.println(y);

Find the syntax errors if any in the following programme:

int i ; sum=0;

i=1;

while(i=<10)

{

sum=sum+i;

i=i+3

}

System.println(sum);

Rewrite the following switch statement using if-else statement and display the result

using appropriate IDE.

switch(number){

case 1:

jLable2.setText(“digits”);

break;

case 10:

jLable2.setText(“Tens”);

break;

case 100:

jLable2.setText(“Hundreds”);

break;

case 1000:

jLable2.setText(“Thousands”);

break;

default:

jLable2.setText(“error”);

break;

}

Find the output of the following code fragments ?

(a) int s = 14; (b) int s = 14;

a) if(s<20) =

System.out.print(“Under”);

Else

System.out.print(“Over”);

System.out.print ln(“the limit”);

b) If (s < 20)

System.out.print(“Under”);

else {

System.out.print(“Over”);

System.out.print ln(“the limit”);}

(c) int s = 94;

If (s < 20) {

System.out.print(“Under”);

}

else {

System.out.print(“Over”);

}

System.out.print ln(“the limit”);

What will be the output of the following code fragment when the value of ch is

(a) ‘A’ (b) ‘B’ (c) ‘D’ (d) ‘F’

switch (ch) {

case ‘A’ : System.out.print ln (“Grade A”);

case ‘B’ : System.out.print ln (“Grade B”);

case ‘C’ : System.out.print ln (“Grade C”);

break;

case ‘D’ : System.out.print ln (“Grade D”);

default : System.out.print ln (“Grade F”);

}

e) The following code has some error(s). Rewrite the correct code underlining all the corrections made.

int i,c,a=5,b=0;

for(i=0,i<20,i++)

{ if b=0 then

break;

else

c=a/b;

system.out.show(“Quotient”+c);

Ans: int i,c,a=5,b=0;

for(i=0;i<20;i++) // at place of comma(,) semicolon (;) should be there

{ if (b==0) // comparison operator = = should be used and brackets are missing.

break;

else

c=a/b;

System..out.Println(“Quotient”+c);

f) What will be the content of jTextField1 and jTextField2 after executing the following code?

String st="Happy New Year 2012";

jTextField1.setText(""+st.substring(17)+st.length());

jTextField2.setText(st.substring(6).trim());

Ans: jTextField1 will contain 1219 and jTextField2 will contain New Year 2012

What would be output of the following code segment written in java.
public static void main(String [] args)
{ int a=10, b= 9;
    boolean x;
    x = a++ == ++b;
    System.out.print("x = "+x); }

Find the output of the following code snippet written in java
public static void main(String []args)
{
    int x=10, y=5;
    System.out.println(x++);
    System.out.println(++y);
    System.out.println((x++ + ++y));
    System.out.println((++x - y++));
    System.out.println((x++) + (++y));
    System.out.println((++x)-(y++));
    System.out.println((x++) + (++x));
    System.out.println("x = "+ X +" y="+ y);
}

Find the output of the following code snippet written in java
public static void main(String []args)
{
    long a=78345,s1=0,s2=0,r;
    while(a>0)
    {
        r=a%10;
        if (r%4==0)
            s1+= r;
        else
            s2+=r;
        a/=10;
    }
    System.out.println("S1 ="+ s1);
    System.out.println("S2 ="+ s2);
}

Find the output of the following code snippet written in java
public static void main(String args[])
{
    int no1=2,no2=1,i;
    while(no2<=3)
    {
        i=no1;
        while(i<=no2)
        {
            no1=no1*i;
            i++;
        }
        System.out.println("No1 "+ no1);
        System.out.println("No2 "+ no2);
        no2++;
    }
}

Find the output of the following code snippet written in java
    public static void main(String args[])
{
        int x=1,y=1,z=1,i=1;
        while(y<=3)
        {
            z=1;
            while(z<=y)
            { x=x*i;
                i++; z++;
            }
            System.out.println("x= "+x);
            y++; } }

Find the output of the following code segment written in JAVA. Assume all necessary header files have been included and ignore any syntax error if any.
public static void main(String [] args)
{
int i = 3, a=0, b=1, n=5, c;
System.out.print(a+ “ “+b+” “);
while ( i < n)
{ c= a + b;
System.out.print(c+” “);
a = c - a;
b = c;
i++; } }

How many times will the following loop get executed and what will be the final value of the variable I after execution the loop is over.
int I = 5;
do
{ I += 3;
    System.out.println("I = "+I);
    I = I + 1; }
while (I >= 9);

Correct the errors in the following program segment written in JAVA. You are just required to write the corrected code, underlying the corrections made.
Public Static Void Main (String [] args)
{
    Integer Nos = 100;
    while (Nos => 45)
    {
        If (Nos % 5 = 0);
            Nos+=10;
        otherwise
            Nos + = 20;     } }

Convert the following ‘while loop’ into its equivalent ‘for loop without altering the output of the program.
int x = 100, a = 30;
while ( x>= 10)
{
    System.out.println(”New Amount =”+(x + a));
    a++;
    x - = a;
}

Predict the output:

a) String name=”TATA”;

int i=0;

While(i<name.length())

{

System.out.println(name.substring(I,i+1));

i++;

}

b) int a=1;

int count=20;

{

a=a*count;

count=count-2;

} while(count<10);

system.out.print(a);

c) Given a string object names salary having value as ‘55000” stored in it ., Obtain the output of the following:

JoptionPane.showMessageDialog(null,+salary.length()+Integer.parseInt(salary));

d) String a=”abc”;

System.out.println(a+”abc”+”12”);

e) Int a =5,b=10;

If(a>5)

If(b>5)

System.out.print(b);

Else

System.out.print(a);

System.out.print(“notvalid”);

f) for(int a= 40;a>10;a--)

Int f=f*a;

System.out.print(f);

g) jTextArea1.setText(“India\nIncredible\n\tIndia”);

h) int x=20;

int y=10;

int z=0;

if((++y<x--)||(y!=5))

{

System.out.println(x++);

System.out.println(y);

Z=++y+ ++x;

System.out.println(z)

System.out.println(x);}

Predict the output:

For(int i=1;i<4;i++)

{

For(int j=1;j<I;j++)

System.out.print(i+” “);

System.out.println();}

Predict the output:

a)Int val1-5,val2=10;

For(int i=1;i<=3;i++)

{

System.out.println(val1++ + “,”+ --val2);

System.out.println(val2--+ “,” + ++val1);

}

b)Int i=10,j=3;

Switch(i/%j)

{

Case 0: System.out.print(“hello”);

Break;

Case 1: system.out.print(“welcome”);

Break;

Case2: system.out.print(“not welcome”);

Break;

}

Convert the following switch into if else

Int j;

J=integer.parseInt(jTextField1.getText());

Switch(j)

{

Case 100: j=j*j;

Case 200: j=j+j;

Break;

Case 300: j=j-j;

Case 400:j=j+2;

Break;

Default:j=j+8;

}

Predict output:

Public static void main(string[] args)

{

String fullname=”bill gates”;

String firstname =””;

Firstname=fullname.substring(0,2);

System.out.print(firstname);

Firstname= FullName.substring(5, 2);

System.out.print(firstname);

Firstname= FullName.substring( 5, FullName.length( ) - 3 );

System.out.print(firstname);

}

Predict output:

String s1 = "Amit";
String s2 = "Amit";
    String s3 = abcd";
    String s4 = abcd";
    System.out.println(s1.equals(s2));
    System.out.println((s1==s2));
    System.out.println(s3.equals(s4));
    System.out.println((s3==s4));

Predict the output:

float f4 = -5.5;
float f5 = 5.5;
float f6 = -5.49;
float f7 = 5.49;
System.out.println("Round f4 is " + Math.round(f4));
System.out.println("Round f5 is " + Math.round(f5));
System.out.println("Round f6 is " + Math.round(f6));
System.out.println("Round f7 is " + Math.round(f7));
}
ans: Round f4 is -5
Round f5 is 6

Round f6 is -5
Round f7 is 5

What will be the values of x and y after execution of the following code:

int x,y=0;

for(x=1;x<=5;++x)

y=x++ + ++x;

--y;

Give the output of the following statements.

jTextField1.setText(Integer.parseInt(“21”+100)+100);

jTextField1.setText(“CBSE\nFinal\tExam”);

What values will be assigned to the variable ua , ub, uc and fail after execution of the following program segment:

int i=0,ua=0,ub=0,uc=0,fail=0;

while(i<=5) {

Switch ( i++ ) {

case 1 :++ua;

case 2 : ++ub; uc++;break;

case 3 :

case 4 : ++uc; ua++;ub++;break;

default : ++fail; } }

The following code has some error(s).Rewrite the correct code underlining all the corrections made:

int SUM=0,Step=5;

int I;

For(i=0;i=<5;++i)

{ Step+=5;

Sum+=Step;}

jTextField1.showText(Double.toString(SUM));

What will be the value of P and Q after execution of the following code?

int P,Q = 100

for (P=10; P<12; P++)

{

Q+ = P;

}

JOptionPane. showMessageDialog(this, “p + “+P+” Q;”+Q+” );

What will be the constants of jTextField1 and jTextField2 after executing the following code:

i) jTextField1.setText(Math.round(25.7)+ “ ”);

ii) jTextField2.setText(Math.pow(2,3)+ “ ”);

What will be the contents of F1 and F2 after the following code is executed?

String F1=”hello”, F2=”Friend”;

F1=F1.concat(F2);

Given the following code fragment :Write an alternative code using switch case.

If(a==0)

{

If(a==1)

System.out.println(“zero”);

System.out.println(“one”);

}

If(a==2)

System.out.println(“two”);

If(a==3)

System.out.println(“three”);

Predict an output of the following code fragments:

int i = 1, j = 0, n = 0;

while(i<4) {

for(j=1;j<= i ; j++)

{ n+= 1;

i = i+1;

}

System.out.println(n);

}

What will be an output of the following code:

int i,j,n;

n=0; i=1;

{

n++; i++;

System.out.println(n+” “+i);

}while(i<=5);

Predict the output of following code fragments:

(a) int i, j, n; (b) int i=1, j=0, n=0;

n=0; i=1; while (i<4) {

do { for(j=1; j<=i; j++) {

n++; i++; n+=1;

} while (i<=5); }

i=i+1;

}

System.out.print ln(n);

while (i<4) { while(j<10) {

n++; i--; System.out.print(j+ “+”);

} s=s+j;

System.out.print ln(n); j=j+j%3;}

System.out.print ln(“=”+s);

Find out errors if any;

(a) m=1; (b) while(ctr !=10) ; {

n=0; ctr=1;

for(;m+n<19;++n) sum=sum + a;

System.out.print ln(“Hello \n”); ctr=ctr + 1;

m=m+10; }

Find errors in the following code :

Import java.sql* ;

:connection conn =

DriveManager.getconnention(“jdbc:mysql://localhost/test”,”root”,”wxyz);

Statement stmt = con.createstatement();

Sql= “SELECT empno,emame,job,sal From EMPL; “ ;

Resultset rs = stmt.executeQuery(sql); }

Catch(Exception e) { }

What will be the output after executing the following code?

int fun(int n)

{ int r=(n%2==0)?1:0;

return r; }

int t=5,p;

{ p=fun(t);

if(p==1)

System.out.println(t+p);

else

System.out.print(t+p);

}while(++t<10);

JAVA NET BEANS -call for classes: 9717570033

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