Mgd01 lab01to03
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The document discusses various Java programming concepts like variables and data types, conditions and loops, including for, while, do-while loops. It shows code examples to demonstrate these concepts, like declaring variables, using primitive and object data types, if-else conditional statements, switch statement with an enum, and for-each loop iterating over an enum.
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public static void main(String[] args) {
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System.out.println(My First Java App);
public static void main(String[] args) {
public class Main {
package firstjavaapp;
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package variablesanddatatypes;
public class Main {
public static void main(String[] args) {
// Variable: must begin with a letter or underscore and
// must consist entirely of letters, digits, and underscores.
/* Data types
- Primitives: byte, short, int, long, float, double,
char and boolean
- Objects: String
*/
double capital = 200.0;
double interestRate = 0.01;
double subTotal = capital * interestRate;
System.out.println(SubTotal = + Double.toString(subTotal));
// Using String
String input = 35;
double total = subTotal + Double.parseDouble(input);
System.out.println(Total = + Double.toString(total));
// Using Math utility class
int length = 5;
double areaOfSquare = Math.pow(length, 2);
System.out.println(Area of Square = + areaOfSquare );
}
}
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package conditionsandloops;
enum Day { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY };
public class Main {
public static void main(String[] args) {
// do while loop
System.out.println(--do while loop--);
boolean wantsToContinue = true; // True to loop again.
int loopcount = 0;
do {
loopcount++; // add 1 to loopcount
if (loopcount == 10)
wantsToContinue = false; // check to set variable
System.out.println(Loop: + loopcount);
} while (wantsToContinue == true); // check at the end
System.out.println(After do while loop);
// while loop to calculate
System.out.println(--while loop--);
int years = 0; // initialize the variable years
double interest, principal, rate;
principal = 1000.0;
rate = 0.01;
while (years 5) { // condition for continuing loop
interest = principal * rate; //
principal += interest; // do three statements
System.out.println(Year + (years+1) + : + principal);
years++; // update the value of the variable, years
}
// for loop, doing same thing as the above while loop
System.out.println(--for loop--);
principal = 1000.0;
for (years = 0; years 5; years++) {
interest = principal * rate;
principal += interest;
System.out.println(Year + (years+1) + : + principal);
}
// for each and enum Day
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}
}
} while (exitLoop.equalsIgnoreCase(N));
exitLoop = scanner.nextLine();
System.out.print(Exit loop (Y/N):);
do {
String exitLoop;
Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
public class Main {
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Mgd01 lab01to03
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- 3. ¨ )( © ¤¢('¨''¨%$ ¥§#2 “‡@ )¥I £§¡ !G ’ !G %!G '§ '¤£! %D ¥… } } System.out.println(My First Java App); public static void main(String[] args) { public class Main { package firstjavaapp; §§I(£§¡ %“'¥ £ ©¥' ) £H ¤¤ B ¥$ ''A %F ¥… ¥§!§ £¨¨§ §§ ¥¨ ¤¥¥ ©¥¨§¦ ¥¤£¢ ¡
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- 5. ¥§!§ £¨¨§ §§ ¥¨ ¤¥¥ ©¥¨§¦ ¥¤£¢ ¡ t„yrts¡„y£ ¢„g t¡wp gugb i©c hgfedcba` ‰(ˆ(‡ ©§¥¢¥† §… %7 ¥… ©¥9D§§'A©¥¤¢§£§D %¥¨§ )¥I ( £§)£¤§ §§ H¥ § ¥§¥E %C ¥… %“¥!¤¢ £ ©¥' ) £H ¤¤ B ¥$ ''A %F ¥… §§I(£§¡ package variablesanddatatypes; public class Main { public static void main(String[] args) { // Variable: must begin with a letter or underscore and // must consist entirely of letters, digits, and underscores. /* Data types - Primitives: byte, short, int, long, float, double, char and boolean - Objects: String */ double capital = 200.0; double interestRate = 0.01; double subTotal = capital * interestRate; System.out.println(SubTotal = + Double.toString(subTotal)); // Using String String input = 35; double total = subTotal + Double.parseDouble(input); System.out.println(Total = + Double.toString(total)); // Using Math utility class int length = 5; double areaOfSquare = Math.pow(length, 2); System.out.println(Area of Square = + areaOfSquare ); } } ¥§#B ¨ )( © ¤¢('¨''¨%$
- 6. ¨ )( © ¤¢('¨''¨%$ ¥§#D ““©£… D ¥ %¥©§) ¥! $£H §© 9¥$ ¥¨E @ “©£… ¥ %¥©§) ¥H ¤ $£H §© ©' $¥¨ ©©§¤) B £¥ ) £¨§† “I “©£… D( ¥¦£¤ ©' $¥¨ H £¥$ ¥§$ 9¥$ '§ ©)¥I¢ ¥§ D¨†( £ ¥9 §§' ¤¤§ ©§ ¨E ¨ B ¥¥BB£ “©¥¤¢! ¥©§(¥¤¢! '§ “©£… (¥¤¢! %£©! £©¥ ) ¥9 §§ “D £… ©£ ¥9 )¥I¢ i §¥¤ ¢ '§ §$) ¥¥¤¢! ' ¥§ ¤B ¥ ¤ ¥£ ¥ $© ¥¥9¢ ¥§ ©¥9 ¥££¨£ i %©¥9 §§ “F C¥¨§†89¨ ¥¥¨§†9¡ ¥¥¤¢§£§D¥§£8 %'£¤§ ¤¤§ ¥§ £H ¤¤ B ¥$D (©¥ )©¥'! '§ ¥©££' ¥©¥¥¤ B 9¤¥£¥ ©£© ) ©!¨ '§ ¥ )©¥'! ¥¥¤ § $£H £¥¢ ©!¨ %©¥¤¢§£§ B ¥¨§† “C ©¥¨¨ ) ¦) ¤¢ B ¡ (© ¡ G ©¥¨¨ ) ¥£¤ ¥¤£© B ¥©e %©¥¨¨ E “7 ¤¤£¡£ £¡ ¢¢¢¡ ¢¤ £¢ ¡ )) ¥§!§ £¨¨§ §§ ¥¨ ¤¥¥ ©¥¨§¦ ¥¤£¢ ¡
- 7. ¥§!§ £¨¨§ §§ ¥¨ ¤¥¥ ©¥¨§¦ ¥¤£¢ ¡ twyyf ¢„g t„yrur¢„y£ i2c hgfedcba` ‰(ˆ(‡ ©§¥¢¥† §… %7 ¥… © 'A£$)§ %¥¨§ )¥I ( £§)£¤§ §§ H¥ § ¥§¥E %C ¥… %“¥!¤¢ £ ©¥' ) £H ¤¤ B ¥$ ''A %F ¥… package conditionsandloops; enum Day { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY }; public class Main { public static void main(String[] args) { // do while loop System.out.println(--do while loop--); boolean wantsToContinue = true; // True to loop again. int loopcount = 0; do { loopcount++; // add 1 to loopcount if (loopcount == 10) wantsToContinue = false; // check to set variable System.out.println(Loop: + loopcount); } while (wantsToContinue == true); // check at the end System.out.println(After do while loop); // while loop to calculate System.out.println(--while loop--); int years = 0; // initialize the variable years double interest, principal, rate; principal = 1000.0; rate = 0.01; while (years 5) { // condition for continuing loop interest = principal * rate; // principal += interest; // do three statements System.out.println(Year + (years+1) + : + principal); years++; // update the value of the variable, years } // for loop, doing same thing as the above while loop System.out.println(--for loop--); principal = 1000.0; for (years = 0; years 5; years++) { interest = principal * rate; principal += interest; System.out.println(Year + (years+1) + : + principal); } // for each and enum Day ¥§#E ¨ )( © ¤¢('¨''¨%$
- 8. ¥§!§ £¨¨§ §§ ¥¨ ¤¥¥ ©¥¨§¦ ¥¤£¢ ¡ // enum Day { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY } System.out.println(for each loop); for (Day d : Day.values()) { System.out.print(d); // print the day System.out.print( is day number ); System.out.println(d.ordinal()); // print the position } // if else System.out.println(--if else--); int myAge = 15; if (myAge 18) { // Check condition for above 18 yrs old System.out.println(Under the Road Traffic Act,you can drive.); } else { // otherwise, below 18 yrs old System.out.println(Under the Road Traffic Act,you cannot drive.); } // switch and enum Day System.out.println(--switch--); Day day = Day.WEDNESDAY; switch (day) { case MONDAY: System.out.println(Mon); break; case TUESDAY: System.out.println(Tue); break; case WEDNESDAY: System.out.println(Wed); case THURSDAY: System.out.println(Thu); case FRIDAY: System.out.println(Fri); break; default: System.out.println(Default); break; } } } ¥§#F ¨ )( © ¤¢('¨''¨%$
- 9. ¨ )( © ¤¢('¨''¨%$ ¥§#G } } } while (exitLoop.equalsIgnoreCase(N)); exitLoop = scanner.nextLine(); System.out.print(Exit loop (Y/N):); do { String exitLoop; Scanner scanner = new Scanner(System.in); public static void main(String[] args) { public class Main { ¤¥§)…(¤£!(§§I ¨£ %£s (¨§ ¥$ £‰¥ ©¥© $) ¥©! ¥$ ¤£! $! $ ¤ ¨§ ¥ ¢§ ¥$ 9B£' ¨ ¥ ¤ ¥¤£$H ' '§ “!£ ¥©! '§¥ ©©§¤) ¥§)… ¥$ £©e ¦( ¡ P Your total roll is 7 The second die comes up 4 The first die comes up 3 %¥¤¨§‰¥ @ (¤¤ ¤§ ¥$ '§ ¥£' $)§¥ £H $© ¥¢¨! ¥$ ¥ '¤! $© ¨§ ! (¤¤ ¤§ ¥$ ¥ ¥$¥ ¥!¤§ £¥$ ''§ '§ ¥£' ' )¥© ¥$ B £§§ £ + 1 int rolledNumber1 = (int) (Math.random() * 6) 7¥¢¨!†'¥¤¤ ¥¤¢§£§ ¥$ £©©§ '§ ‡ 7 ¨ B ¥¢¨! § ¥§¥¥ ¤¤£H ¥¨¥§© £H ¤¤ B ¥$D %£s ('¥¤¤ ©£ £ ¥B§ ¥£' ¥$ ¥¢¨! ¥$ ©¥©¥¥ ¦)£ ! 9 ¥¢¨! ¥$D (¨ '§ § ‡ ¥I ¥D ¥F ¥C ¥7 ©¥¥£ ¥$ B ¥ £© $) 9¢ ¥£' ¥ £¤¤ ¥§¤!¨£© §) ! (¥)£' B £§ § B £¤¤ ¥§¤!¨£© §$ ¨§ § ¥£ ¦ ¡ P ¡trƒs¡ H ¤ ‰¥ ¥$ ¨!I %¥!£ ) ¤ ¥$ B ! ¨!I %¦§¥¢ %¥!£ ) '§ ¦§¥¢ “F “I!$ ¤¤§B ¦§¤¢ 9¤ ¨) ¨ B ¥¥BB£' $! $ ¤¤§B ©H ¤¤§ $)£H© $)£H© '§ ¥©¤¥ B£ %£$)§ “C “¨) ¨ B ¥¥BB£' ©£ ‰§9© $)§¥ B $)§¥ B '§ B ¥¥¤£$H ¥¥¤£$H ' %© “7 ¤¤£¡£ £¡ ¢¢¢¡ ¢¤ £¢ ¡ )) ¥§!§ £¨¨§ §§ ¥¨ ¤¥¥ ©¥¨§¦ ¥¤£¢ ¡
- 10. ¥§!§ £¨¨§ §§ ¥¨ ¤¥¥ ©¥¨§¦ ¥¤£¢ ¡ The first die comes up 3 The second die comes up 4 Your total roll is 7 Exit loop (Y/N):N The first die comes up 3 The second die comes up 5 Your total roll is 8 Exit loop (Y/N): ¥ § # ¡ ¨ )( © ¤¢('¨''¨%$