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Showing content from https://www.tutorialspoint.com/java/if_statement_in_java.htm below:

Java - if Statement

A Java if statement consists of a Boolean expression followed by one or more statements.

Following is the syntax of an if statement −

if(Boolean_expression) {
   // Statements will execute if the Boolean expression is true
}

If the Boolean expression evaluates to true then the block of code inside the if statement will be executed. If not, the first set of code after the end of the if statement (after the closing curly brace) will be executed.

In this example, we're showing the use of a if statement to check if a value of variable, x is less than 20. As x is less than 20, the statement within if block will be printed.

public class Test {

   public static void main(String args[]) {
      int x = 10;

      if( x < 20 ) {
         System.out.print("This is if statement");
      }
   }
}

This is if statement.

In this example, we're showing the use of a if statement to check if a boolean value is true or false. As x is less than 20, result will be true and the statement within if block will be printed.

public class Test {

   public static void main(String args[]) {
      int x = 10;
      boolean result = x < 20;

      if( result ) {
         System.out.print("This is if statement");
      }
   }
}

This is if statement.

In this example, we're showing the use of a if statement to check if a boolean value is false. As x is not greater than 20, result will be true and the statement within if block will be printed.

public class Test {

   public static void main(String args[]) {
      int x = 10;
      boolean result = x > 20;

      if( !result ) {
         System.out.print("This is if statement");
      }
   }
}

This is if statement.

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