Java if else program

Java if else program uses if else to execute statement(s) when a condition is fulfilled. Below is a simple program which explains the usage of if else in java programming language.

Java programming if else statement

// 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.");
    }
  }
}

Output of program:

Above program ask the user to enter marks obtained in exam and the input marks are compared against minimum passing marks. Appropriate message is printed on screen based on whether user passed the exam or not. In the above code both if and else block contain only one statement but we can execute as many statements as required.

Nested If Else statements

You can use nested if else which means that you can use if else statements in any if or else block.

import java.util.Scanner;
 
class NestedIfElse {
  public static void main(String[] args) {
    int marksObtained, passingMarks;
    char grade;
 
    passingMarks = 40;
 
    Scanner input = new Scanner(System.in);
 
    System.out.println("Input marks scored by you");
 
    marksObtained = input.nextInt();
 
    if (marksObtained >= passingMarks) {
 
      if (marksObtained > 90) 
        grade = 'A';
      else if (marksObtained > 75)
        grade = 'B';
      else if (marksObtained > 60)
        grade = 'C';
      else
        grade = 'D'; 
 
      System.out.println("You passed the exam and your grade is " + grade);
    }
    else {
      grade = 'F'; 
      System.out.println("You failed and your grade is " + grade);
    }
  }
}