An assortment of programming examples covering many different topics. Many searchable collection of source code snippets illustrating specific tasks best coding practices. With our programming samples you will be able to add your own functionality to the already existing sample. All the examples are made available here for you to copy and paste into your programs.
Free Java Source Code Links
1. Core Java Programs [PAGE 1]
2. Core Java Programs [PAGE 2]
3. Core Java Programs [PAGE 3]
4. Date Utility Code Snippet
5. String Utility Code Snippet
Core Java Programs [ PAGE 1]
Some Java programs which help lot of java beginners to understand the basic fundamentals in Java programming.
Program 1
//Find Maximum of 2 nos.
class Maxof2{
public static void main(String args[]){
//taking value as command line argument.
//Converting String format to Integer value
int i = Integer.parseInt(args[0]);
int j = Integer.parseInt(args[1]);
if(i > j)
System.out.println(i+" is greater than "+j);
else
System.out.println(j+" is greater than "+i);
}
}
Program 2
//Find Minimum of 2 nos. using conditional operator
class Minof2{
public static void main(String args[]){
//taking value as command line argument.
//Converting String format to Integer value
int i = Integer.parseInt(args[0]);
int j = Integer.parseInt(args[1]);
int result = (i<j)?i:j;
System.out.println(result+" is a minimum value");
}
}
Program 3
/* Write a program that will read a float type value from the keyboard and print the following output.
->Small Integer not less than the number.
->Given Number.
->Largest Integer not greater than the number.
*/
class ValueFormat{
public static void main(String args[]){
double i = 34.32; //given number
System.out.println("Small Integer not greater than the number : "+Math.ceil(i));
System.out.println("Given Number : "+i);
System.out.println("Largest Integer not greater than the number : "+Math.floor(i));
}
Program 4
/*Write a program to generate 5 Random nos. between 1 to 100, and it
should not follow with decimal point.
*/
class RandomDemo{
public static void main(String args[]){
for(int i=1;i<=5;i++){
System.out.println((int)(Math.random()*100));
}
}
}
Program 5
/* Write a program to display a greet message according to
Marks obtained by student.
*/
class SwitchDemo{
public static void main(String args[]){
int marks = Integer.parseInt(args[0]); //take marks as command line argument.
switch(marks/10){
case 10:
case 9:
case 8:
System.out.println("Excellent");
break;
case 7:
System.out.println("Very Good");
break;
case 6:
System.out.println("Good");
break;
case 5:
System.out.println("Work Hard");
break;
case 4:
System.out.println("Poor");
break;
case 3:
case 2:
case 1:
case 0:
System.out.println("Very Poor");
break;
default:
System.out.println("Invalid value Entered");
}
}
}
Program 6
/*Write a program to find SUM AND PRODUCT of a given Digit. */
class Sum_Product_ofDigit{
public static void main(String args[]){
int num = Integer.parseInt(args[0]); //taking value as command line argument.
int temp = num,result=0;
//Logic for sum of digit
while(temp>0){
result = result + temp;
temp--;
}
System.out.println("Sum of Digit for "+num+" is : "+result);
//Logic for product of digit
temp = num;
result = 1;
while(temp > 0){
result = result * temp;
temp--;
}
System.out.println("Product of Digit for "+num+" is : "+result);
}
}
Program 7
/*Write a program to Find Factorial of Given no. */
class Factorial{
public static void main(String args[]){
int num = Integer.parseInt(args[0]); //take argument as command line
int result = 1;
while(num>0){
result = result * num;
num--;
}
System.out.println("Factorial of Given no. is : "+result);
}
}
Program 8
/*Write a program to Reverse a given no. */
class Reverse{
public static void main(String args[]){
int num = Integer.parseInt(args[0]); //take argument as command line
int remainder, result=0;
while(num>0){
remainder = num%10;
result = result * 10 + remainder;
num = num/10;
}
System.out.println("Reverse number is : "+result);
}
}
Program 9
/*Write a program to find Fibonacci series of a given no.
Example :
Input - 8
Output - 1 1 2 3 5 8 13 21
*/
class Fibonacci{
public static void main(String args[]){
int num = Integer.parseInt(args[0]); //taking no. as command line argument.
System.out.println("*****Fibonacci Series*****");
int f1, f2=0, f3=1;
for(int i=1;i<=num;i++){
System.out.print(" "+f3+" ");
f1 = f2;
f2 = f3;
f3 = f1 + f2;
}
}
}
Program 10
/* Write a program to find sum of all integers greater than 100 and
less than 200 that are divisible by 7 */
class SumOfDigit{
public static void main(String args[]){
int result=0;
for(int i=100;i<=200;i++){
if(i%7==0)
result+=i;
}
System.out.println("Output of Program is : "+result);
}
}