Tutorial: Install Java on Windows XP and Learn the Basics of Java 6 using the NetBeans IDE

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T U T O R I A L

Install Java on Windows XP and Learn the Basics of Java 6 using the NetBeans IDE

1. Download Java 2. Install Java 3. HelloWorld at command prompt 4. Download and Install NetBeans 5. HelloWorld in NetBeans 6. Arrays 7. Multidimensional Arrays 8. ArrayLists with Generics 9. HashMaps with Generics

9. HashMaps with Generics

This shows you how to use HashMaps which contain objects identified with keys, and since you can now use generics this makes for clean code when you need a collection of particular objects that you need to process in different ways.

In the main method, type in the following line and comment out the others.

main.DemonstrateHashMaps();

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Paste in the following code above the final ending bracket.

    public void DemonstrateHashMaps() {

        //define
        HashMap <String, ArrayList> inventories = new HashMap <String, ArrayList>();
        ArrayList <String> mainInventory = new ArrayList <String>();
        ArrayList <String> branchInventory = new ArrayList <String>();

        //main inventory
        mainInventory.add("productMain72323");
        mainInventory.add("productMain71113");
        mainInventory.add("productMain72243");
        inventories.put("main", mainInventory);

        //branch inventory
        branchInventory.add("productBranch72323");
        branchInventory.add("productBranch71113");
        branchInventory.add("productBranch72243");
        inventories.put("branch", branchInventory);

        //display all inventories
        for(ArrayList <String> inventory : inventories.values()) {

            //show inventory
            for(String item : inventory) {
                System.out.println(item);
            }

        }

    }

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In order to use HashMaps, you have to type in the following line at the top of the file after the package line.

import java.util.HashMap;

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Press F5 to compile.

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