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Java Basics: Creating Objects and Using DecimalFormat

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Learn how to create objects in Java with examples including Scanner, DecimalFormat, Random. Explore formatting decimal numbers with DecimalFormat class. Practice generating random numbers and calculating averages.

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Java Basics: Creating Objects and Using DecimalFormat

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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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