WAP of Switch case in Java

/*WAP to capture the two integer values from user and perform following actions according to user Requierement
1. Addition
2. Substraction
3. Multiplication
4. Division
5. Exit
*/

import java.lang.*;
import java.io.*;
class oprations
{
 public void InputMsg()
 {System.out.println("Enter Two Integer numbers. ");}
 
 public void continueMsg()
 {System.out.println("Do you want to Continue. \n1. Yes \n0. No");}
 
 public static void main (String args[]) throws IOException
 {
  int a , b, choice = -1 ;
  
  do
  {
    System.out.println("Choose a Opration");
    System.out.println("1. Addition \n2. Substraction \n3. Multiplication \n4. Division \n5. Exit \nYour Choice: ");

    BufferedReader br = new BufferedReader(new 
         InputStreamReader(System.in));
    oprations e = new oprations();
    choice = Integer.parseInt(br.readLine());
    int repeate = -1;
    
   do
   {
    
    switch(choice)
    {
     
     case 1: e.InputMsg();
        a = Integer.parseInt(br.readLine());
        b = Integer.parseInt(br.readLine());
     System.out.println("Addition = "+(a+b));
    
     e.continueMsg();
     repeate = Integer.parseInt(br.readLine());
     break;
     case 2: e.InputMsg();
        a = Integer.parseInt(br.readLine());
        b = Integer.parseInt(br.readLine());
     System.out.println("Substraction = "+(a-b));
     
     e.continueMsg();
     repeate = Integer.parseInt(br.readLine());
     break;
     case 3: e.InputMsg();
        a = Integer.parseInt(br.readLine());
        b = Integer.parseInt(br.readLine());
     System.out.println("Multiplication = "+(a*b));
     
     e.continueMsg();
     repeate = Integer.parseInt(br.readLine());
     break;
     case 4: e.InputMsg();
        a = Integer.parseInt(br.readLine());
        b = Integer.parseInt(br.readLine());
     System.out.println("Division = "+(a/b));
     
     e.continueMsg();
     repeate = Integer.parseInt(br.readLine());
     break;
     case 5: System.out.println("BYE!"); 
     break;
     default: System.out.println("Invalid Input.");
    }
    
   }while(repeate != 0 && choice != 5);
   
  }while(choice != 5); 
 }
 
}

WAP of Matrix Multiplication in Java

/*WAP of Matrix Multiplication in Java*/

import java.lang.*;
import java.io.*;
import java.util.*;
class matrix
{
 public static void main (String args[]) throws IOException
 {
  int a[][] = new int[2][2];
  int b[][] = new int[2][2];
  int c[][] = new int[2][2];
  
  Scanner sc = new Scanner(System.in);
  System.out.println("Enter Elements of Matrix 1");
  for(int i=0; i<2; i++)
  {
   for(int j=0; j<2; j++)
   {
   a[i][j] = sc.nextInt();
   }
  }

  System.out.println("Enter Elements of Matrix 2");
  for(int i=0; i<2; i++)
  {
   for(int j=0; j<2; j++)
   {
   b[i][j] = sc.nextInt();
   }
  }
  // calculation
  for(int i=0; i<2; i++)
  {
   for(int j=0; j<2; j++)
   {
    for(int k=0; k<2; k++)
    {
   c[i][j] += a[i][k] * b[k][j];
    }
   }
  }
  System.out.println("Matrix After multiplication");
  for(int i=0; i<2; i++)
  {
   for(int j=0; j<2; j++)
   {
   System.out.println( "\t" + c[i][j] );
   }
  }
 }
}

WAP to that includes a method inside a class

/*WAP to that includes a method inside a class*/
class Box {
double width;
double height;
double depth;
// display volume of a box
void volume() {
System.out.print("Volume is ");
System.out.println(width * height * depth);
}
}
class BoxDemo3 {
public static void main(String args[]) {
Box mybox1 = new Box();
Box mybox2 = new Box();
// assign values to mybox1's instance variables
mybox1.width = 10;
mybox1.height = 20;
mybox1.depth = 15;
/* assign different values to mybox2's
instance variables */
mybox2.width = 3;
mybox2.height = 6;
mybox2.depth = 9;
// display volume of first box
mybox1.volume();
// display volume of second box
mybox2.volume();
}
}

WAP to declares two Box class objects

/*WAP to declares two Box class objects*/
class Box {
double width;
double height;
double depth;
}
class BoxDemo2 {
public static void main(String args[]) {
Box mybox1 = new Box();
Box mybox2 = new Box();
double vol;
// assign values to mybox1's instance variables
mybox1.width = 10;
mybox1.height = 20;
mybox1.depth = 15;
/* assign different values to mybox2's
instance variables */
mybox2.width = 3;
mybox2.height = 6;
mybox2.depth = 9;
// compute volume of first box
vol = mybox1.width * mybox1.height * mybox1.depth;
System.out.println("Volume is " + vol);
// compute volume of second box
vol = mybox2.width * mybox2.height * mybox2.depth;
System.out.println("Volume is " + vol);
}
}

WAP that calculate volume of Box

/*WAP that calculate volume of Box
Save as BoxDemo.java
*/

class Box {
double width;
double height;
double depth;
}
// This class declares an object of type Box.
class BoxDemo {
public static void main(String args[]) {
Box mybox = new Box();
double vol;
// assign values to mybox's instance variables
mybox.width = 10;
mybox.height = 20;
mybox.depth = 15;
// compute volume of box
vol = mybox.width * mybox.height * mybox.depth;
System.out.println("Volume is " + vol);
}
}

WAP Using a do-while loop to process a menu selection

/*WAP Using a do-while loop to process a menu selection
save file as: Menu.java
*/

class Menu {
public static void main(String args[])
throws java.io.IOException {
char choice;
do {
System.out.println("Help on:");
- 84 -
System.out.println(" 1. if");
System.out.println(" 2. switch");
System.out.println(" 3. while");
System.out.println(" 4. do-while");
System.out.println(" 5. for\\n");
System.out.println("Choose one:");
choice = (char) System.in.read();
} while( choice < '1' || choice > '5');
System.out.println("\\n");
switch(choice) {
case '1':
System.out.println("The if:\\n");
System.out.println("if(condition) statement;");
System.out.println("else statement;");
break;
case '2':
System.out.println("The switch:\\n");
System.out.println("switch(expression) {");
System.out.println(" case constant:");
System.out.println(" statement sequence");
System.out.println(" break;");
System.out.println(" // ...");
System.out.println("}");
break;
case '3':
System.out.println("The while:\\n");
System.out.println("while(condition) statement;");
break;
case '4':
System.out.println("The do-while:\\n");
System.out.println("do {");
System.out.println(" statement;");
System.out.println("} while (condition);");
break;
case '5':
System.out.println("The for:\\n");
System.out.print("for(init; condition; iteration)");
System.out.println(" statement;");
break;
}
}
}

WAP to An improved version of the season program

/*WAP to An improved version of the season program*/

class Switch {
public static void main(String args[]) {
int month = 4;
String season;
switch (month) {
case 12:
case 1:
case 2:
season = "Winter";
break;
case 3:
case 4:
case 5:
season = "Spring";
break;
case 6:
case 7:
case 8:
season = "Summer";
break;
case 9:
case 10:
case 11:
season = "Autumn";
break;
default:
season = "Bogus Month";
}
System.out.println("April is in the " + season + ".");
}
}

WAP to check that In a switch, break statements are optional

/*WAP to check that In a switch, break statements are optional*/

class MissingBreak {
public static void main(String args[]) {
for(int i=0; i<12; i++)
switch(i) {
case 0:
case 1:
case 2:
case 3:
case 4:
System.out.println("i is less than 5");
break;
case 5:
case 6:
case 7:
case 8:
case 9:
System.out.println("i is less than 10");
break;
default:
System.out.println("i is 10 or more");
}
}
}

WAP to Demonstrate switch statements

/*WAP to Demonstrate switch statements*/

class SampleSwitch {
public static void main(String args[]) {
for(int i=0; i<6; i++)
switch(i) {
case 0:
System.out.println("i is zero.");
break;
case 1:
System.out.println("i is one.");
break;
case 2:
System.out.println("i is two.");
break;
case 3:
System.out.println("i is three.");
break;
default:
System.out.println("i is greater than 3.");
}
}
}

WAP to Demonstrate if-else-if statements

/*WAP to Demonstrate if-else-if statements*/

class IfElse {
public static void main(String args[]) {
int month = 4; // April
String season;
if(month == 12 || month == 1 || month == 2)
season = "Winter";
else if(month == 3 || month == 4 || month == 5)
season = "Spring";
else if(month == 6 || month == 7 || month == 8)
season = "Summer";
else if(month == 9 || month == 10 || month == 11)
season = "Autumn";
else
season = "Bogus Month";
System.out.println("April is in the " + season + ".");
}
}

WAP to Demonstrate ? : Ternary operator

/*WAP to Demonstrate ? : Ternary operator*/

class Ternary {
public static void main(String args[]) {
int i, k;
i = 10;
k = i < 0 ? -i : i; // get absolute value of i
System.out.print("Absolute value of ");
System.out.println(i + " is " + k);
i = -10;
k = i < 0 ? -i : i; // get absolute value of i
System.out.print("Absolute value of ");
System.out.println(i + " is " + k);
}
}

WAP to Demonstrate the boolean logical operators

/*WAP to Demonstrate the boolean logical operators*/

class BoolLogic {
public static void main(String args[]) {
boolean a = true;
boolean b = false;
boolean c = a | b;
boolean d = a & b;
boolean e = a ^ b;
boolean f = (!a & b) | (a & !b);
boolean g = !a;
System.out.println(" a = " + a);
System.out.println(" b = " + b);
System.out.println(" a|b = " + c);
System.out.println(" a&b = " + d);
System.out.println(" a^b = " + e);
System.out.println("!a&b|a&!b = " + f);
System.out.println(" !a = " + g);
}
}

WAP of bit

/*WAP of bit*/

class OpBitEquals {
public static void main(String args[]) {
int a = 1;
int b = 2;
int c = 3;
a |= 4;
b >>= 1;
c <<= 1;
a ^= c;
System.out.println("a = " + a);
System.out.println("b = " + b);
System.out.println("c = " + c);
}
}

WAP to Unsigned shifting a byte value

/*WAP to Unsigned shifting a byte value.
Save As: ByteUShift.java
*/

class ByteUShift {
static public void main(String args[]) {
char hex[] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
byte b = (byte) 0xf1;
byte c = (byte) (b >> 4);
byte d = (byte) (b >>> 4);
byte e = (byte) ((b & 0xff) >> 4);
System.out.println(" b = 0x" + hex[(b >> 4) & 0x0f] + hex[b & 0x0f]);
System.out.println(" b >> 4 = 0x" + hex[(c >> 4) & 0x0f] + hex[c & 0x0f]);
System.out.println(" b >>> 4 = 0x" + hex[(d >> 4) & 0x0f] + hex[d & 0x0f]);
System.out.println("(b & 0xff) >> 4 = 0x" + hex[(e >> 4) & 0x0f] + hex[e & 0x0f]);
}
}

WAP to Masking sign extension

/*WAP to Masking sign extension.
Save As : HexByte.java
*/

class HexByte {
static public void main(String args[]) {
char hex[] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
byte b = (byte) 0xf1;
System.out.println("b = 0x" + hex[(b >> 4) & 0x0f] + hex[b &
0x0f]);
}
}

WAP to Left shifting as a quick way to multiply by 2

/*WAP to Left shifting as a quick way to multiply by 2.
Save As: MultByTwo.java
*/

class MultByTwo {
public static void main(String args[]) {
int i;
int num = 0xFFFFFFE;
for(i=0; i<4; i++) {
num = num << 1;
System.out.println(num);
}
}
}

WAP to Left shifting a byte value

/*WAP to Left shifting a byte value.
Save As ByteShift.java
*/

class ByteShift {
public static void main(String args[]) {
byte a = 64, b;
int i;
i = a << 2;
b = (byte) (a << 2);
System.out.println("Original value of a: " + a);
System.out.println("i and b: " + i + " " + b);
}
}

WAP to Demonstrate the bitwise logical operators

/*WAP to Demonstrate the bitwise logical operators
Save As: BitLogic.java
*/

class BitLogic {
public static void main(String args[]) {
String binary[] = {
"0000", "0001", "0010", "0011", "0100", "0101", "0110",
"0111",
"1000", "1001", "1010", "1011", "1100", "1101", "1110",
"1111"
};
int a = 3; // 0 + 2 + 1 or 0011 in binary
int b = 6; // 4 + 2 + 0 or 0110 in binary
int c = a | b;
int d = a & b;
int e = a ^ b;
int f = (~a & b) | (a & ~b);
int g = ~a & 0x0f;
System.out.println(" a = " + binary[a]);
System.out.println(" b = " + binary[b]);
System.out.println(" a|b = " + binary[c]);
System.out.println(" a&b = " + binary[d]);
System.out.println(" a^b = " + binary[e]);
System.out.println("~a&b|a&~b = " + binary[f]);
System.out.println(" ~a = " + binary[g]);
}
}

WAp to Demonstrate ++ operator

/*WAp to Demonstrate ++ operator
Save as: IncDec.java
*/

class IncDec {
public static void main(String args[]) {
int a = 1;
int b = 2;
int c;
int d;
c = ++b;
d = a++;
c++;
System.out.println("a = " + a);
System.out.println("b = " + b);
System.out.println("c = " + c);
System.out.println("d = " + d);
}
}

WAP to Demonstrate several assignment operators

/*WAP to Demonstrate several assignment operators*/

class OpEquals {
public static void main(String args[]) {
int a = 1;
int b = 2;
int c = 3;
a += 5;
b *= 4;
c += a * b;
c %= 6;
System.out.println("a = " + a);
System.out.println("b = " + b);
System.out.println("c = " + c);
}
}