How do you make an array of arrays?

[mrjaeyun]

public class Budget{

///////////////fields////////////////
private String expenseName;
int expenseAmount[] = {1000, 2000, 3000, 4000, 5000, 6000};
int monthNumber[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
int i=0; // this is arbitrary. Never hard code numbers unless that number is never going to change. in that case you make a variable and define it.
int month_num;
int clothes[]=null;
int tuiton[]=null;
int transportation[]=null;
int food[]=null;
int housing[]=null;



/////////constructors///////////////
public Budget() {}

public Budget(String name) {this.expenseName = name;}

public Budget(String name, int num)
{
this.expenseName = name;
this.expenseAmount[i] = num;
this.monthNumber[i] = month_num;
}


/////////////methods///////////
public String getexpenseName() {return expenseName;}

public int getexpenseAmount() {return expenseAmount[i];}//change the I

public int getmonthNumber() {return monthNumber[i];}//change the i

public void setExpenseName(String name)
{
this.expenseName = name;
}

public boolean setexpenseAmount(int num)
{
if (this.expenseAmount[i] == 0)
{this.expenseAmount[i] = num;
return true;
}
else
return false;
}}
i think i created an array of expenses which is int expenseName. i need to an array for each for expense which is int clothes[], int tuition[]. how would i create do that?

[mrjaeyun]

i changed the coding for expenseName a little bit


public class Budget{

///////////////fields////////////////
private String expenseName[];
int expenseAmount[] = {1000, 2000, 3000, 4000, 5000, 6000};
int monthNumber[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
int i=0; // this is arbitrary. Never hard code numbers unless that number is never going to change. in that case you make a variable and define it.
int month_num;
int clothes[]=null;
int tuiton[]=null;
int transportation[]=null;
int food[]=null;
int housing[]=null;



/////////constructors///////////////
public Budget() {}

public Budget(String name) {this.expenseName[i] = name;}

public Budget(String name, int num)
{
this.expenseName[i] = name;
this.expenseAmount[i] = num;
this.monthNumber[i] = month_num;
}


/////////////methods///////////
public String getexpenseName() {return expenseName[i];}

public int getexpenseAmount() {return expenseAmount[i];}//change the I

public int getmonthNumber() {return monthNumber[i];}//change the i

public void setExpenseName(String name)
{
this.expenseName[i] = name;
}

public boolean setexpenseAmount(int num)
{
if (this.expenseAmount[i] == 0)
{this.expenseAmount[i] = num;
return true;
}
else
return false;
}}