Array of buttons

[harmansodhi03]

How to use array of buttons.
JButton[] b1,b2;
b1[0]=new JButton("0");
b1[1]=new JButton("1");
b1[2]=new JButton("2");
b1[3]=new JButton("3");
b1[4]=new JButton("4");
b1[5]=new JButton("5");
b1[6]=new JButton("6");
b1[7]=new JButton("7");
b1[8]=new JButton("8");
b1[9]=new JButton("9");
for(int i=0;i<=9;i++)
{
p3.add(b1[i]);
}

is showing NullPointerException.
Plz Help

[r035198x]

How to use array of buttons.
JButton[] b1,b2;
b1[0]=new JButton("0");
b1[1]=new JButton("1");
b1[2]=new JButton("2");
b1[3]=new JButton("3");
b1[4]=new JButton("4");
b1[5]=new JButton("5");
b1[6]=new JButton("6");
b1[7]=new JButton("7");
b1[8]=new JButton("8");
b1[9]=new JButton("9");
for(int i=0;i<=9;i++)
{
p3.add(b1[i]);
}

is showing NullPointerException.
Plz Help

1.) When posting code please use code tags
2.) After

Button[] b;

b is still null. To instantiate it you need to do

Button[] b = new Button[theSize];

3.) You can use a for loop to shorten long lines of code like

 b1[0]=new JButton("0");
  b1[1]=new JButton("1");
  b1[2]=new JButton("2");
  b1[3]=new JButton("3");
  b1[4]=new JButton("4");
  b1[5]=new JButton("5");
  b1[6]=new JButton("6");
  b1[7]=new JButton("7");
  b1[8]=new JButton("8");
  b1[9]=new JButton("9"); 

to

for(int i = 1; i < 10; i++) {
             b1[i] = new JButton(""+i);
 } 

[nickyeng]

1.) When posting code please use code tags
2.) After

Button[] b;

b is still null. To instantiate it you need to do

Button[] b = new Button[theSize];

3.) You can use a for loop to shorten long lines of code like

 b1[0]=new JButton("0");
  b1[1]=new JButton("1");
  b1[2]=new JButton("2");
  b1[3]=new JButton("3");
  b1[4]=new JButton("4");
  b1[5]=new JButton("5");
  b1[6]=new JButton("6");
  b1[7]=new JButton("7");
  b1[8]=new JButton("8");
  b1[9]=new JButton("9"); 

to

for(int i = 1; i < 10; i++) {
             b1[i] = new JButton(""+i);
 } 

gotcha.
I also recommend for loop to instantiate each jbutton object.

good luck, TS.