Posts Tagged ‘Java tutorial for beginners’
Using For Each in Java
Posted on: April 2, 2020
- In: Core Java Tutorials | Java Source Code | Java Tutorials
- Comments Off on Using For Each in Java
Objective:
- How to use For Each in Java?
- How to use advance for in Java?
- How to use advance for loop in Java Programming Language?
- Types of For loop in Java
Source Code:
class ForEachExample
{
public static void main(String args[])
{
//declaring an array
int a[]={1,2,3,4,5,6};
// Old way
System.out.println("Old way");
for(int i=0; i<a.length;i++)
{
System.out.println(a[i]);
}
//New way: for-each loop
System.out.println("For each");
for(int i:a)
{
System.out.println(i);
}
}
}
Tags: Core Java Tutorial, Core Java Tutorials, For each in java, for each loop in java, Free Java Tutorials, How to use advance for in Java, How to use For Each in Java, Java Tutorial, Java tutorial for beginners, Java Tutorials, Java Tutorials for Beginners, Types of For loop in Java, using for each in java, using for each loop in java
- In: Core Java Tutorials | How to's | Java Source Code | Java Tutorials
- Comments Off on Pattern Programs in Java – Pattern 2
Pattern 2 :
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
Java Program for the above pattern:
import java.util.Scanner;
public class MainClass
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//Taking rows value from the user
System.out.println("How many rows you want in this pattern?");
int rows = sc.nextInt();
System.out.println("Here is your pattern....!!!");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(i+" ");
}
System.out.println();
}
//Close the resources
sc.close();
}
}
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Pattern Programs In Java – Pattern 1
Posted on: May 21, 2018
- In: Core Java Tutorials | Java Source Code | Java Tutorials
- Comments Off on Pattern Programs In Java – Pattern 1
Q. Write a Java program to print given pattern.
Pattern 1 :
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
Java Program:
import java.util.Scanner;
public class MainClass
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//Taking rows value from the user
System.out.println("How many rows you want in this pattern?");
int rows = sc.nextInt();
System.out.println("Here is your pattern....!!!");
for (int i = 1; i <= rows; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print(j+" ");
}
System.out.println();
}
//Close the resources
sc.close();
}
}
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- In: Java Source Code | Java Tutorials | NetBeans IDE Source Code
- Comments Off on Java Program to convert Decimal values to Hexadecimal values
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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