Java - Statement if Statement

Syntax

The format of an if-else statement is

if (condition)
    statement1
else
    statement2

The condition must be a Boolean expression, which evaluates to true or false.

If the condition evaluates to true, statement1 is executed. Otherwise, statement2 is executed.

The else part is optional. You may write a statement as

if (condition)
    statement1

Example

The following code checks the num1 value range.

int num1 = 20;
int num2 = 30;
if (num1 > 50)
   num2 = num2 + 10;
else
   num2 = num2 - 10;

Demo

public class Main {
  public static void main(String[] args) {
    int num1 = 20;
    int num2 = 30;
    if (num1 > 50)
      num2 = num2 + 10;//  w  ww .  ja v  a  2  s  .  com
    else
      num2 = num2 - 10;
    System.out.println("num2 = " + num2);

  }
}

Result

if block statement

You can bundle two statements into one block statement.

if (num1 > 50) {
  num2 = num2 + 10;
  num3 = num3 + 10;
} else {
  num2 = num2 - 10;
  num3 = num3 - 10;
}

Demo

public class Main {
  public static void main(String[] args) {
    int num1 = 20;
    int num2 = 30;
    int num3 = 40;
    if (num1 > 50) {
      num2 = num2 + 10;//  w w w .  java2s.  c  o  m
      num3 = num3 + 10;
    } else {
      num2 = num2 - 10;
      num3 = num3 - 10;
    }
    System.out.println("num2 = " + num2);
    System.out.println("num2 = " + num3);
  }
}

Result

Related Topics

• Nested if statement
• if statement vs ternary operator
• Grading System
• determines if input number is prime
• Use if else statement to output day of week
• Valid Triangle
• Sort three numbers
• print all numbers from 1-1000 that are divisible by both 3 and 5
• Use loops to do simple math
• Use conditional statements
• Age range with if statement
• Find Duplicate in an int value array with nested for loop
• Get the Smallest Of 3 Numbers
• Check if a number is prime number
• User chooses a number then checks if it matches the random number and loops again if you lose and stops until you win
• checks how much time has passed by via Scanner

Quiz

• What is the result: int i =5; if (i = 5){
• What is the result: boolean b; if (b = true) {

Exercise

• Write code to compare two string for equality using nested if statements
• Write code to get minimum of three integers using nested Math.min method without using if statements
• Write code to return default value for Null Or Blank string using if statement
• Write code to return default value for null String using if statement
• Write code to compare two string for equal using if statement and handle null value
• Write code to compare two string value for equality with nested if statement
• Write code to convert String value to Boolean using if statement to check
• Write code to cut string by length using if statement
• Write code to check if a string is Blank value using if statement
• Write code to check if a string is A Number via Long.parseLong()
• Write code to Count the occurrences of character in a string.
• Write code to sort characters in a String Ascending using bubble sort
• Write code to get min value from three integers
• Write code to remove Non Letter Or Digits
• Write code to remove Adjacent Underscores
• Write code to get Digits Only String
• Write code to concatenate the strings and filter out null value.
• Write code to remove Prefix
• Write code to Return self prefixed by "a " or "an " according to a simple (and therefore inadequate) heuristic
• Write code to convert String To TimeStamp
• Write code to Convert a string to its plural form.
• Write code to Return the number of times a particular String occurs in another String.
• Write code to format file Size to readable String
• Write code to remove File Name Suffix from path string
• Write code to Append correct delimiter to a number th, st, rd returning the number and delimiter appended
• Write code to format Timestamp in long value to string in mm:ss format
• Write code to check if a string is Numeric using for loop forward
• Declare loop control variable inside and outside for loop

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