Java Programs

Hello World If else

• Hello World Java Program

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  class HelloWorld
  {
     public static void main(String args[])
     {
        System.out.println("Hello World");
     }
  }
  

• If else Java Program

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  // If else in Java code
  import java.util.Scanner;
   
  class IfElse {
    public static void main(String[] args) {
      int marksObtained, passingMarks;
   
      passingMarks = 40;
   
      Scanner input = new Scanner(System.in);
   
      System.out.println("Input marks scored by you");
   
      marksObtained = input.nextInt();
   
      if (marksObtained >= passingMarks) {
        System.out.println("You passed the exam.");
      }
      else {
        System.out.println("Unfortunately you 
                   failed to pass the exam.");
      }
    }
  }
  

• For loop Java Program

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  //Java for loop syntax
  for (/* Initialization of variables */ ;
       /*Conditions to test*/ ; 
       /* Increment(s) or decrement(s) of variables */) 
  {
    // Statements to execute i.e. Body of for loop
  }
  
  Example : for (int a=1; a<=10; a++);
  
  //Java for loop program
  class ForLoop {
    public static void main(String[] args) {
      int c;
   
      for (c = 1; c <= 10; c++) {
        System.out.println(c);
      }
    }
  }
  
  //Java for loop example to print stars in console
  class Stars {
    public static void main(String[] args) {
      int row, numberOfStars;
   
      for (row = 1; row <= 10; row++) {
        for(numberOfStars = 1; numberOfStars <= row; 
            numberOfStars++) {
          System.out.print("*");
        }
        System.out.println(); // Go to next line
      }
    }
  }
  
  
  // Infinite for loop
  for (;;) {
    System.out.println("Java programmer");
  }
  //You can terminate an infinite loop by pressing Ctrl+C.