Creating objects
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Creating Objects PowerPoint PPT Presentation


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Creating Objects. Pepper. Objects You Already Create. Scanner: Import java.util.Scanner ; Scanner scn = new Scanner(System.in); Pictures: import javalib.worldimages .*; import java.awt.Color ; WorldImage myCircle = AImage.makeCircle (50,Color.blue, Mode.filled );

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Creating Objects

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Creating objects

Creating Objects

Pepper


Objects you already create

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);


New object decimalformat

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


New object random

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


Exercise

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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