Archive for the ‘Free Source Code’ Category
Objectives :
- How to convert Decimal to Hexadecimal in Java?
Java Program to convert Decimal values to Hexadecimal values :
import java.util.Scanner;
public class DecimalToHexadecimal {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter decimal number you like: ");
int deci = input.nextInt();
System.out.println("The hexadecimal number for decimal "
+ deci + " is " + convert(deci));
}
public static String convert(int decimal) {
String hex = "";
while (decimal != 0) {
int hexValue = decimal % 16;
hex = toHexadecimal(hexValue) + hex;
decimal = decimal / 16;
}
return hex;
}
public static char toHexadecimal(int hexValue) {
if (hexValue <= 9 && hexValue >= 0) {
return (char) (hexValue + '0');
} else {
return (char) (hexValue - 10 + 'A');
}
}
}
Output :
Enter decimal number you like: 1234
The hexadecimal number for decimal 1234 is 4D2
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Objectives :
- Convert Decimal number to Roman number
- Convert Decimal numeral to Roman numeral
- How to convert a decimal number to roman number
- Write a program that converts a decimal number to Roman number.
- Write a program that converts a decimal number to Roman number. Decimal Number is accepted using Scanner class at the time of execution.
- Write a program that converts a decimal number to Roman number. Decimal Number is accepted as command line input at the time of execution.
Program :
Java program that converts a decimal number to Roman number. Decimal Number is accepted using Scanner class at the time of execution.
import java.util.Scanner;
public class DecimalToRoman {
private static String toRoman(int num) {
String[] romanCharacters = { "M", "CM", "D", "C", "XC", "L", "X", "IX", "V", "I" };
int[] romanValues = { 1000, 900, 500, 100, 90, 50, 10, 9, 5, 1 };
String result = "";
for (int i = 0; i < romanValues.length; i++) {
int numberInPlace = num / romanValues[i];
if (numberInPlace == 0) continue;
result += numberInPlace == 4 && i > 0? romanCharacters[i] + romanCharacters[i - 1]:
new String(new char[numberInPlace]).replace("\0",romanCharacters[i]);
num = num % romanValues[i];
}
return result;
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number : ");
int decimal = scanner.nextInt();
System.out.println(toRoman(decimal));
}
}
Output :
Enter a number : 1234
MCCXXXIV
Java program that converts a decimal number to Roman number. Decimal Number is accepted as command line input at the time of execution.
public class DecimalToRoman {
private static String toRoman(int num) {
String[] romanCharacters = { "M", "CM", "D", "C", "XC", "L", "X", "IX", "V", "I" };
int[] romanValues = { 1000, 900, 500, 100, 90, 50, 10, 9, 5, 1 };
String result = "";
for (int i = 0; i < romanValues.length; i++) {
int numberInPlace = num / romanValues[i];
if (numberInPlace == 0) continue;
result += numberInPlace == 4 && i > 0? romanCharacters[i] + romanCharacters[i - 1]:
new String(new char[numberInPlace]).replace("\0",romanCharacters[i]);
num = num % romanValues[i];
}
return result;
}
public static void main(String[] args) {
if(args.length<1 || args.length>1){
System.out.println("Wrong input");
}else{
String number = args[0];
int decimal = Integer.parseInt(number);
System.out.println(toRoman(decimal));
}
}
}
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Objective :
- Passing data between activities in Android
- Passing multiple data between activities in Android
- Passing array between activities in Android
- Passing ArrayList between activities in Android
- Passing ArrayList to another activity in Android
- Sending data via Intent in Android
- Sending multiple data via Intent in Android
- Sending array between activities in Android
- Sending ArrayList between activities in Android
- Sending ArrayList to another activity in Android
- Sending data via Intent and Bundle in Android
- Sending multiple data via Intent and Bundle in Android
- Passing array between activities in Android using Intent and Bundle
- How to pass array to another activity in Android?
- How to pass array between activities in Android?
- How to pass data to another activity in Android?
- How to pass data to activity in Android?
- How to pass data to between activities in Android?
- How to pass ArrayList to another activity in Android?
- How to pass ArrayList between activities in Android?
Code for passing data between activities in Android :
ActivityOne.java
String value = "Hello!";
Intent in = new Intent(this,ActivityTwo.class);
in = putExtra("Key", value);
startActivity(in);
ActivityTwo.java
Bundle bundle = getIntent().getExtras();
String valueReceived = bundle .getString("Key");
Code for passing multiple data or values between activities in Android :
Method 1 : Using Intent to pass data and Bundle to extract data between activities in Android
ActivityOne.java
String value1 = "Hello!";
String value2 = "Hi!";
Intent in = new Intent(this,ActivityTwo.class);
in = putExtra("Key1", value1); startActivity(in);
in = putExtra("Key2", value2); startActivity(in);
ActivityTwo.java
Bundle bundle = getIntent().getExtras();
String valueReceived1 = bundle .getString("Key1");
String valueReceived2 = bundle .getString("Key2");
Method 2 : Using Bundle to pass and to extract data between activities in Android
ActivityOne.java
String value1 = "Hello!";
String value2 = "Hi!";
Intent in = new Intent(this,ActivityTwo.class);
Bundle bundle = new Bundle();
bundle.putString("Key1", value1);
bundle.putString("Key2", value2);
in = putExtras(bundle);
startActivity(in);
ActivityTwo.java
Bundle bundle = getIntent().getExtras();
String valueReceived1 = bundle .getString("Key1");
String valueReceived2 = bundle .getString("Key2");
Code for passing array between activities in Android :
ActivityOne.java
String[] array = new String[]{"Item1", "Item2", "item3", "Item4", "item5"};
Intent in = new Intent(this,ActivityTwo.class);
Bundle bundle = new Bundle();
bundle.putStringArray("MyArray", array);
in = putExtras(bundle);
startActivity(in);
ActivityTwo.java
Bundle bundle = getIntent().getExtras();
String arrayReceived[] = bundle.getStringArray("MyArray");
Code for passing ArrayList between activities in Android :
ActivityOne.java
ArrayList<String> array = new ArrayList<String>();
array.add("Hello");
array.add("Hi");
array.add("Bye");
Intent intent = new Intent(this, ActivityTwo.class);
intent.putExtra("array_list", array);
startActivity(intent);
ActivityTwo.java
Bundle bundle = getIntent().getExtras();
ArrayList<String> array = (ArrayList<String>) bundle.getStringArrayList("array_list");
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Objectives :
- Binary to Decimal Conversion
- Converting Binary to Decimal
- Write a program to convert binary to decimal
- Write a program to convert binary number to decimal format
- Write a program to convert binary to decimal using Scanner class
- Write a program to convert binary to decimal, take input using Scanner class
Java Program :
import java.util.Scanner;
public class BinaryToDecimal {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter binary number: ");
String binary = scanner.nextLine();
int decimal = binaryToDecimal(binary);
System.out.println("Decimal equivalent of "+ binary +" is "+ decimal);
}
private static int binaryToDecimal(String binary) {
final int base = 2;
int decimal = 0;
for (int i = 0; i < binary.length(); i++) {
if (binary.charAt(i) == '0') {
decimal += 0 * Math.pow(base, binary.length() - i - 1);
} else if (binary.charAt(i) == '1') {
decimal += 1 * Math.pow(base, binary.length() - i - 1);
} else {
System.out.println("Invalid Binary Number");
System.out.println("Binary Number Contains only 0's or 1's");
System.exit(0);
}
}
return decimal;
}
}
Output :
Enter binary number: 1110
Decimal equivalent of 1110 is 14
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Objectives :
- Write a program to compute sum of digits of a given number.
- Write a program to find sum of digits of a given number.
- Write a program to calculate sum of digits of a given number.
- Write a program to compute sum of digits of a given integer number.
- Write a program to compute sum of digits of a number entered via Command Line.
- Write a program to compute sum of digits of a given number. Take input from Command Line.
- Write a program to compute sum of digits of a given number. Take input using Scanner class.
Following is the Java Program to compute Sum of Digits of a given integer number;
Method 1 : Java Program to find Sum of Digits when number is entered from command line
class SumOfDigits
{
public static void main(String args[])
{
int n;
int a=0;
int sum=0;
//taking integer number from command line and parsing the same
n=Integer.parseInt(args[0]);
while(n!=0)
{
a=n%10;
n=n/10;
sum=sum+a;
}
System.out.println("Sum of digits: " + sum);
}
}
Steps to run above program via command line :
- Compilation : C:\JavaPrograms>javac SumOfDigits.java
- Interpretation : C:\JavaPrograms>java SumOfDigits 12345
Output : Sum of digits: 15
Method 2 : Java Program to find Sum of Digits if input is taken using Scanner class
import java.util.Scanner;
public class SumOfDigits {
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
int n;
int a=0;
System.out.print("Enter a positive number: ");
n = in.nextInt();
if (n <= 0)
System.out.println("You have entered a negative number.");
else {
int sum = 0;
while (n != 0) {
a=n%10;
n=n/10;
sum=sum+a;
}
System.out.println("Sum of digits: " + sum);
}
}
}
Steps to run above program via command line :
- Compilation : C:\JavaPrograms>javac SumOfDigits.java
- Interpretation : C:\JavaPrograms>java SumOfDigits 12345
Output :
Trial 1 : With positive number
Enter a positive number: 12345
Sum of digits: 15
Trial 2 : With negative number
Enter a positive number: -12345
You have entered a negative number.
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