Install Java in Ubuntu 14.04

Check if Java is already installed in Ubuntu

open a terminal with (Ctrl+Alt+T) and run the command :

java -version

if you seen an output like below : it means you don't have Java installed on your system. 

The program ‘java’ can be found in the following packages:
* default-jre
* gcj-4.6-jre-headless
* openjdk-6-jre-headless
* gcj-4.5-jre-headless
* openjdk-7-jre-headless
Try: sudo apt-get install

if you see an output like below : it means you have Java installed on your system.

 java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

Install Java in Ubuntu 

Install JRE (Java Runtime Environment) in Ubuntu

Open terminal and run the following commands.

sudo apt-get install default-jre

Install OpenJDK (Jave Development Kit) in Ubuntu 

Open terminal and run the following commands.

sudo apt-get install default-jdk

Install Oracle JDK in Ubuntu

Open terminal and run the following commands of Java8 or Java7 (Couple of files need to get install so make sure that your Internet speed is high.)

Java 8 (Java 1.8)

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

sudo apt-get install oracle-java8-installer

sudo apt-get install oracle-java8-set-default

OR 

 

 Java 7 (Java 1.7)

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

sudo apt-get install oracle-java7-installer

sudo apt-get install oracle-java7-set-default

 Now Check with the following command

java -version

You will see the output like:

 java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

 I hope it helped you to install Java.

Exercise - 1 (C Language Problems)  

Q.1. Consider the function

    find (int x, int y)

    { return ( ( x < y) ? 0 : ( x -y ) ) ; }

Let a , b be two non – negative integers. Which of the following calls finds the possible difference of a and b ?

a) find ( a , b) + find ( b , a )

b) find ( a , find ( a , b ) )

c) a + find ( a , b )

d) b + find ( a , b )

Q.2. The Statement

    if ( myPtr != NULL )

    *myPtr = NULL;

    else

   *myPtr = NULL;

has the same effect as the statement(s)

a) if ( myPtr ) *myPtr = NULL ;

else *myPtr = NULL;

b) *myPtr = NULL;

c) if ( !myPtr ) *myPtr = NULL ;

else *myPtr = NULL;

d) if ( myPtr == NULL ) *myPtr = NULL;

else *myPtr = NULL;

Q.3. The following program fragment

    if ( a= 7)

    printf( “ a is seven ” );

    else

    printf( “ a is not seven ” );

results in the printing of

a) a is seven

b) a is not seven

c) nothing

d) garbage value

Q.4. The following loop

     for ( for i = 1, j = 10 ; i < 6 ; ++ i, --j)

     printf(“%d %d”, i, j);

prints

a) 1 10 2 9 3 8 4 7 5 6

b) 1 2 3 4 5 10 9 8 7 6

c) 1 1 1 1 1 9 9 9 9 9

d) none of the above

Q.5. The following Program

main()

{

    int i=5;

    if (i==5) return;

    else printf(“i is not five ” ) ;

    printf(“over”);

}

results in

a) a syntax error

b) an execution error

c) printing of over

d) execution termination, without printing anything

Q.6. Consider the following program fragment

    if ( a > b )

    printf( “ a > b” );

    else

    printf(“else part”);

    printf(“ a < = b”);

a <= b will be printed if

a) a > b

b) a < b

c) a == b

d) None of the above 

Q.7. Consider the following program 
void main()
{
     int counter = 40;
     for(;counter;)
     printf("Sample");
     printf("%d",counter);
}
What will be the output?
a) 40
b) -40
c) 0
d) None of these

Q.8. What will be the output of following program?
void main()
{
     static char a[ ] = "JAIPUR";
     char * b = "JAIPUR";
     printf("\n %d %d", size of (a), size of (b));
}
a) a = 7, b = 7
b) a = 7, b = 2
c) a = 2, b = 7
d) a = 7, b = 0

Q.9. printf("%d",printf("Hello"));
a) results in a syntax error
b) outputs Hello5
c) outputs garbage
d) prints Hello and terminates abruptly 

Q.10. If n has the value 3 then the output of the statement 
     printf("%d %d", n++ , ++n ); is
a) 3   5
b) 4   5
c) 4   4
d) is implementation dependent

Q.11. printf("%c", 100);
a) prints 100
b) prints the ASCII equivalent of 100
c) prints garbage
d) none of the above

Q.12. printf("%f", 9/5);   prints
a) 1.8
b) 1.0
c) 2.0
d) none of the above

Q.13. The following program fragment
     for( i = 3; i < 15; i += 3 );
     printf("%d", i );
results in 
a) a syntax error
b) an execution error
c) printing of 12
d) printing of 15

Q.14. The following program fragment
    for ( i =1; i <5; ++i )
    if ( i == 3) continue;
    else printf("%d", i );
results in the printing of
a) 1  2  4  5
b) 1  2  4
c) 2  4  5
d) None of these

Q.15. The statement 
     printf("%f", (float) 9/5);
prints
a) 1.8
b) 1.0
c) 2.0
d) none of the above

Q.16. The following program fragment
     if(a = 0)
     printf("a is zero");
     else
     printf("a is not zero");
results in the print of 
a) a is zero
b) a is not zero
c) nothing
d) garbage

Q.17. The following program fragment
     int k = -7
     printf("%d", 0 < !k);
a) prints 0
b) prints a non-zero value
c) is illegal
d) prints an unpredictable value

Q.18. The following program fragment 
     int i  = 107, x = 5;
     printf( (x > 7) ? "%d" : "%c",  i );
results in 
a) an execution error
b) a syntax error
c) printing of k
d) none of the above

Q.19. The following statements
     for( i = 3; i < 15 ;  i += 3)
     {
        printf("%d", i);
        ++i;
      }
will result in the print of 
a) 3  6  9  12
b) 3  6  9  12  15
c) 3  7  11
d) 3  7  11  15

Q.20. The following program fragment
    void main()
    {
      int x = 0;
      while(x <= 10)
      for(;;)
      if(++x%10 == 0)
      break;
      printf("%d", x);
     }
results in
a) printing of 10
b) printing of 20
c) infinite loop
d) none of the above

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