Documentation
The Java™ Tutorials
Download Ebooks
Download JDK
Search Java Tutorials
Hide TOC
Language Basics
Variables
Primitive Data Types
Arrays
Summary of Variables
Questions and Exercises
Operators
Assignment, Arithmetic, and Unary Operators
Equality, Relational, and Conditional Operators
Bitwise and Bit Shift Operators
Summary of Operators
Questions and Exercises
Expressions, Statements, and Blocks
Questions and Exercises
Control Flow Statements
The if-then and if-then-else Statements
The switch Statement
The while and do-while Statements
The for Statement
Branching Statements
Summary of Control Flow Statements
Questions and Exercises
Trail: Learning the Java Language
Lesson: Language Basics
« Previous • Trail • Next »

# Questions and Exercises: Operators

## Questions

1. Consider the following code snippet.

       arrayOfInts[j] > arrayOfInts[j+1]

   Which operators does the code contain?
2. Consider the following code snippet.

       int i = 10;
       int n = i++%5;

   1. What are the values of `i` and `n` after the code is executed?
   2. What are the final values of `i` and `n` if instead of using the postfix increment operator (`i++`), you use the prefix version (`++i)`)?
3. To invert the value of a `boolean`, which operator would you use?
4. Which operator is used to compare two values, `=` or `==` ?
5. Explain the following code sample: `result = someCondition ? value1 : value2;`

## Exercises

1. Change the following program to use compound assignments:

       class ArithmeticDemo {

            public static void main (String[] args){

                 int result = 1 + 2; // result is now 3
                 System.out.println(result);

                 result = result - 1; // result is now 2
                 System.out.println(result);

                 result = result * 2; // result is now 4
                 System.out.println(result);

                 result = result / 2; // result is now 2
                 System.out.println(result);

                 result = result + 8; // result is now 10
                 result = result % 7; // result is now 3
                 System.out.println(result);
            }
       }

2. In the following program, explain why the value "6" is printed twice in a row:

       class PrePostDemo {
           public static void main(String[] args){
               int i = 3;
               i++;
               System.out.println(i);    // "4"
               ++i;
               System.out.println(i);    // "5"
               System.out.println(++i);  // "6"
               System.out.println(i++);  // "6"
               System.out.println(i);    // "7"
           }
       }

Check your answers

« Previous • Trail • Next »

Previous page: Summary of Operators
Next page: Expressions, Statements, and Blocks