[Discuss] Custom array works like PHP array

Question

So far, i only tested it with string object and i hope it also work with other object.
Please give me any suggestion or inform me if have any error.
class ObjArray
{   protected Object key[];
    protected Object field[][];
    public ObjArray(Object k[],Object f[][]){   reset(k,f); }
    public void reset(Object k[],Object f[][])
    {   if(k.length<f.length)throw new ArrayIndexOutOfBoundsException();
        key=k;
        field=f;
    public Object[] getKey(){   return key; }
    public Object[] getField(int k){    return field[k];    }
    public Object[] getField(Object k){   return field[getIndex(k)];    }
    public Object getName(int k){   return key[k];  }
    public int getIndex(Object k)
    {   for(int i=0;i<key.length;i++) if(k==key) return i;
throw new ArrayIndexOutOfBoundsException(); //It should be something to do with the key key.
public Object getValue(int k,int f){    return field[k][f]; }
public Object getValue(Object k,int f){ return field[getIndex(k)][f]; }
public void push(Object k[],Object f[][])
{   if(k!=null)
{   Object[] temp=key;
key=null;
key=new Object[temp.length+k.length];
for(int i=0;i<temp.length;i++) key[i]=temp[i];
int length=temp.length;
for(int i=0;i<k.length;i++) key[length++]=k[i];
temp=null;
if(f!=null)
{   int length=field.length+f.length;
if(key.length<length)throw new ArrayIndexOutOfBoundsException();
Object[][] temp=field;
field=null;
field=new Object[length][];
for(int i=0;i<temp.length;i++)
{   length=temp[i].length;
field[i]=new Object[length];
for(int j=0;j<length;j++) field[i][j]=temp[i][j];
length=temp.length;
for(int i=0;i<f.length;i++)
{   field[length]=new Object[f[i].length];
for(int j=0;j<f[i].length;j++) field[length][j]=f[i][j];
length++;
temp=null;
public void dump()
{   for(int i=0;i<key.length;i++)
{   System.out.println(key[i]+"=>");
if(i+1>field.length) System.out.println();
else for(int j=0;j<field[i].length;j++) System.out.println(" "+field[i][j]);
public static void main(String[] args)
{   String[] key={"Name","Age","Location","Interest"};
String[][] field=
{   {"Max"},
{"21"},
{"Net surfing","Gaming","Learning"},
String[] key2={"Gender","Email","Height","status"};
String[][] field2=
{"[email protected]","[email protected]","[email protected]"},
{"180"},
     ObjArray a=new ObjArray(key,field);
     a.dump();
     System.out.println();
/*output
Name=>
     Max
Age=>
     21
Location=>
Interest=>
     Net surfing
     Gaming
     Learning
     a.push(key2,field2);
     a.dump();
     System.out.println();
/*output
Name=>
Max
Age=>
21
Location=>
Interest=>
Net surfing
Gaming
Learning
Gender=>
Email=>
[email protected]
[email protected]
[email protected]
Height=>
180
status=>
     a.reset(key,field);
     a.dump();
     System.out.println();
/*output
Name=>
Max
Age=>
21
Location=>
Interest=>
Net surfing
Gaming
Learning
     Object[] k=a.getKey();
     for(int i=0;i<k.length;i++) System.out.println(k[i]);
/*ouput
Name
Age
Location
Interest
     Object[] f=a.getField(3);
     for(int i=0;i<f.length;i++) System.out.println(f[i]);
/*output
Net surfing
Gaming
Learning
     Object[] f2=a.getField("Interest");
     for(int i=0;i<f2.length;i++) System.out.println(f2[i]);
/*output
Net surfing
Gaming
Learning
     System.out.println("getName(3): "+a.getName(3));
//getName(3): Interest
     System.out.println("getIndex(\"Interest\"): "+a.getIndex("Interest"));
//getIndex("Interest"): 3
     System.out.println("getValue(3,1): "+a.getValue(3,1));
//getValue(3,1): Gaming
     System.out.println("getValue(\"Interest\",1): "+a.getValue("Interest",1));
getValue("Interest",1): Gaming
If it works as good as expected, i will add  few method(pop,remove,insert,shift,replace...)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

>
Almost. LinkedHashMap is an associative array that remembers the order of insertion. You can't however directly access it's n-th element.
And if the value associated with any given key is a list, then it can hold multiple values.
But: I don't really understand the advantage of being able to access the elements with both a key and an index. It seems pretty fragile to me.