Java - Memory Implementation

Question

class Memory{
    private int[] memoryArray;
    private int size;
    public Memory(int n)
    {size = n;
        memoryArray = new int[n];
        for(int i=0;i<n;i++)
            memoryArray[i] = -1;
    }
    public void write (int loc,int val)
    {if (loc >=0 && loc < size)
            memoryArray[loc] = val;
        else
            System.out.println("index out of range");
    }
    public int read (int loc)
    {return memoryArray[loc];
    }

}

Here is my program to test it...

class Test{
    public static void main(String[] args)
    {
        Memory mymem = new Memory(100);
        mymem.write(98 , 4);
        int x;
        x = mymem.read(98);
        System.out.println(mymem);
        mymem.dump();
        for(int i=0;i<size;i++)
            if(i%10==0)
                System.out.println(memoryArray[i]);
                                   else
                                       System.out.println(memoryArray[i]);
                                   }
    }

So when I type in java Memory to run it I get an error saying "Exception in thread "main" java.lang.NoSuchMethodError:main and when I run java Test it outputs [email protected] can I fix this?

the code as it is won't compile, so I'm not sure how you get any output. — beny23
– beny23, Commented Jan 26, 2010 at 0:02

Anon. · Accepted Answer · 2010-01-25 23:54:42Z

5

Your Memory class does not have a main() method.

You probably want to type java Test.

Regarding your other problem, memoryArray isn't visible from your Test class. And Memory doesn't have a dump method.

answered Jan 25, 2010 at 23:54

Anon.

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2 Comments

Darron Over a year ago

And "Memory@9931f5" is the standard format produced by Object.toString() as invoked by the System.out.println(mymem) call.

Tom Hawtin - tackline Over a year ago

(java.util.Arrays.toString will be the method you want for a sensible output from the actual array (otherwise will have nonsesne starting with '[').)

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