Andrei Besedin - Amazing JAVA: Learn JAVA Quickly!

Make a new class ControFlow and add following lines: int a = 10; if ( a < 11) { System. out .println( "A is less than 10" ); } else { System. out .println( "A is not less than 10" ); } expected : A is less than 10 will be printed to console. Let`s make it a little more difficult. Just like in a real life, you can provide more than one condition for any situation. In this case, it is made by adding else if statement.

Add following lines to current classand run it : int b = 15; if ( b == 13) System. out .println( "b == 13" ); elseif (( b <=17) && ( b >= 12)) System. out .println( "b is less than or equal to 17 and greater than or equal to 12" ); else System. out .println( "b is not any from this" ); expected : b is less than or equal to 17 and greater than or equal to 12 will be printed to console. Program first checks if b == 13, it is not, then checks another condition which is true and print it to console. If this condition was also false, then last one sentence will be printed.

Try to make another condition on your own to see output. You can see that statement works fine also without curly braces. Now we got idea how to make a simple program in Java. Let`s solve this problem. Imagine that you had test in your school. You got some score and grade.

Try to make program, using if statement, to check which grade you got based on your score. Note : First you need to declare two variables score and grade, like this: int grade ; int score = 85; Try it yourself firstly, think about conditions. Here is solution: if ( score >= 95) grade = 10; elseif ( score >= 85) grade = 9; elseif ( score >= 75) grade = 8; elseif ( score >= 65) grade = 7; elseif ( score >= 55) grade = 6; else grade = 5; System. out .println( "Grade is: " + grade ); expected : Grade is: 9 will be printed to console Let`s now see one simple example of code: if ( i < 10) a = i * 100; else a = i * 10; Now look at this code: a = i <10 ? i * 100 : i * 10; This is same thing made in two different ways . Like if/else statement this line of code tells to compile to check if i < 10, if it is true a = i * 100. If it is false, then multiply i with 10 (i * 10).