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Creating Objects in Java: Random Numbers, Decimal Formatting, and Graphics

This guide covers the essentials of creating objects in Java, including how to use the Scanner for input, generate random numbers with the Random class, and format decimal numbers using DecimalFormat. Learn how to create simple graphics, such as circles with colors, using the javalib library. Exercises at the end will challenge you to apply your knowledge by generating random dice values, calculating their average, and formatting the output to one decimal place. Perfect for beginners looking to master object creation in Java.

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Creating Objects in Java: Random Numbers, Decimal Formatting, and Graphics

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  1. Creating Objects Pepper

  2. Objects You Already Create • Scanner: • Import java.util.Scanner; • Scanner scn = new Scanner(System.in); • Pictures: • import javalib.worldimages.*; • import java.awt.Color; • WorldImagemyCircle = AImage.makeCircle(50,Color.blue, Mode.filled); • Color bluegrey = new Color(23,32,43);

  3. New Object - DecimalFormat • Knows how to format a decimal number • Library: java.text.DecimalFormat • Import java.text.DecimalFormat; • Tell it your format method when you create it • DecimalFormatmyf = new DecimalFormat("0.0#"); • Ask your formatter to format any number • myf.format(3.555); • myf.format(x); • Many formats: http://pic.dhe.ibm.com/infocenter/adiehelp/v5r1m1/index.jsp?topic=%2Fcom.sun.api.doc%2Fjava%2Ftext%2FDecimalFormat.html

  4. New Object - Random • Knows how to create a random number • Library: java.util.Random • import java.util.Random • Create a random maker guy • Random r = new Random(); • Ask him to give you a number out of # choices: • nextInt(6); returns 0 – 5 • nextInt(13); returns 0-12

  5. Exercise • Generate 2 dice values using Random • Print the two dice values • Divide by 2 to get the average • Print the average with only 1 decimal place

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