Java Else Keyword

1. The else statement specifies a section of Java code that will run if an if statement's condition is false.
2. The following conditional statements can be used in Java:
   • To provide a block of program to run or execute only if a certain condition is true, then we need to use the if block to execute the program.
   • If the given or provided condition is false, then we will describe it in the else block of code that should be printed.
   • To define various code blocks to be performed, use the switch command.
3. In if-else statement, the Java keyword or reserved word else is used in executing the opposite statement to the if keyword.
4. When an if statement is false, the otherwise statement is always carried out. It is a branching statement component that is optional.
5.  Optional else part statements are carried out when the if statement returns false.

Syntax of an Else Keyword in Java

if(condition)
{
<state> //the block or portion of if statements
}
else
{
<state> //the portion or part where the else statements are involved or executed.
}

Control flow jumps to the else section and performs those statements if the Boolean expression is false.

Simple Example

if(test_expression) {
//truecondition is excuted in this block of statements
System.out.println("True condition: Raju is well characterised person");
}
else {// false conditional statement is executed in this portion
System.out.println("False condition:Raju is not a characterised person");
}

Let us consider the example programs to understand better about else keyword.

Examples Programs for Else Keyword in Java

Example program 1:

class Else{
public static void main (String args []) {
double age=21;
if(age>21) {
//It is executed if condition is true
System.out.println("you are eligible for marriage");
}
else {//executed if the given condition is false statement
System.out.println("you are not eligible for marriage");
}
}
}

Output of the code is executed; it produced the following result:

You are not eligible for marriage

Example program 2:

//A Java Program to demonstrate the use of if-else statement.  
//It is a program of odd and even number
public class If_lseEx {  
public static void main (String [] s) {  
    //variable declaration
    int integer=13;
    ///Verify whether the number is divisible by two.
    if(integer%2==0) {
        System.out.println("Given integer is even");
} else {
        System.out.println("Given integer is odd");
    }  
}  
}  

Output of the given program is:

Given integer is odd

Example program 3:

Example program of leap year

If a year can be divided by 4 and 400, it is a leap year. not by 100, though.

public class LeapYearEx3 {    
public static void main (String [] s) {    
double year=2020.
if (((year % 4 ==0) && (year % 100! =0)) || (year % 400==0)) {
        System.out.println("The year is a leap year");
    }  
else {
        System.out.println("The year is not a leap year");
    }  
}    
}    

Output of the program is given by:

The year is a leap year

Example program 4:

/Java programme to show how the If-else-if ladder is used.
/
It is a programme that assigns grades for failure, a D, a C, a B, an A, and an A+.
public class If_Else_IfEx4 {  
public static void main (String [] s) {  
    int score=83;


    if(score<50) {
        System.out.println("unsuccess");
    }  
    else if(score>=50 &&score<60) {
        System.out.println("D points");
    }  
    else if(score>=60 &&score<70) {
        System.out.println("C points");
    }  
    else if(score>=70 &&score<80) {
        System.out.println("B points");
    }  
    else if(score>=80 &&score<90) {
        System.out.println("A points");
} else if(score>=90 &&score<100) {
        System.out.println("A+ points");
} else {
        System.out.println("Invalid statement!");
    }  
}  
}  

Output of the program is:

C points

Example program 5:

Program to check whether a given number is POSITIVE, NEGATIVE or ZERO:

public class P_N_Ex5 {    
public static void main (String [] s) {    
    int Integer=-182;
if (Integer>0) {
    System.out.println("The number is positive");
} elseif (Integer<0) {
    System.out.println("The number is negative");
} else {
    System.out.println("The number is zero");
   }  
}    
}    

Output of the program is:

The number is negative.

Example program 6:

/Java Program to Show Nested If Statements in Action.
public class NestedIfEx6 {    
public static void main (String [] s) {    
doubleyears=20;
doubleheight=120;
    //applying condition on years and height  
    if(years>=18) {
        if(height>50) {
            System.out.println("can donate the blood");
        }    
    }    
}}  

Output of the program is:

Can donate the blood