Java For Loop Problems

Question

JButton nupp0 = new JButton(); // Teen nupu objektid, rida 54 
JButton nupp1 = new JButton();
JButton nupp2 = new JButton();
JButton nupp3 = new JButton();
JButton nupp4 = new JButton();
JButton nupp5 = new JButton();
JButton nupp6 = new JButton();
JButton nupp7 = new JButton();

public JButton nupud[] = { nupp0, nupp1, nupp2, nupp3, nupp4, nupp5, nupp6, nupp7 };

I was told to create this pieace of code in for loop, Ive tried many ways, but I cant get it to work. Any Ideas?

These are my 2 tries:

for (int i =0 ; i < nupud.length ; i++) {
    JButton nupud[i] = new JButton;     
}

for (int i = 0 ; i < nupud.length ; i++) {
    nupud[i] = new JButton();
}

Answer 1

Just new up the array first:

JButton[] nupud = new JButton[8];
for (int i = 0 ; i < nupud.length; i++){
    nupud[i] = new JButton();
}

Answer 2

Looks like you are missing this before the for loop.

JButton[] nupud = new JButton[length];

Answer 3

I just check it my eclipse its work :

package com.demo.swain;

public class JButton {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        JButton nupp0 = new JButton(); // Teen nupu objektid, rida 54 
        JButton nupp1 = new JButton();
        JButton nupp2 = new JButton();
        JButton nupp3 = new JButton();
        JButton nupp4 = new JButton();
        JButton nupp5 = new JButton();
        JButton nupp6 = new JButton();
        JButton nupp7 = new JButton();

     JButton[] nupud = { nupp0, nupp1, nupp2, nupp3, nupp4, nupp5, nupp6, nupp7};
        for (int i =0 ; i < nupud.length ; i++) {
            nupud[i] = new JButton();
                  System.out.println(nupud[i]);
        }
    }

}

Output:

com.demo.swain.JButton@dc74f8d
com.demo.swain.JButton@1837b90c
com.demo.swain.JButton@7255cf3f
com.demo.swain.JButton@5f996bbd
com.demo.swain.JButton@51707653