[英]Accessing value of a variable in a method with parameters in another method
正如你在public void form4()中看到的,我想創建一個JLabel數組,其大小取決於public void receiver(String rlc)中的變量x。 String rlc的值來自我的另一個類。 如果不可能,請給我建議或其他方式。 謝謝
package name1;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import javax.swing.JTextField;
public class NAME4 extends JFrame implements ActionListener
{
public int x;
String letter = "";
String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
JLabel label1;
JTextField part;
String count,count2;
int value;
double lite;
int arraycount;
int array;
JLabel[] parted;
String[] characters;
JButton okbutton;
int int1;
public String ameer;
JLabel label56;
public NAME4()
{
super ("My Game4");
setSize(500,500);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setResizable(true);
setLocationRelativeTo(null);
form4();
}
public void form4()
{
label1 = new JLabel(letter);
setLayout(new FlowLayout(1,250,25));
part = new JTextField(null,3);
okbutton = new JButton("OK");
okbutton.addActionListener(this);
add(label1);
add(part);
add(okbutton);
parted = new JLabel[x];
}
public void receiver(String rlc)
{
x = Integer.parseInt(rlc);
lite = 26/x;
arraycount = (int) lite;
array = arraycount +1 ;
for (int a = 1; a < alphabet.length()+1; a++)
{
letter = letter + alphabet.charAt(a-1);
if ((a) % x == 0)
{
letter = letter + "|";
}
}
label1.setText(letter);
characters = new String [array];
int inc = x;
int y;
int h=0,z;
for (z = 0 ; z < array ; z++)
{
characters[z] = "";
for (y = h ; y < inc ; y++)
{
characters[z] += letter.charAt(y);
}
h += (x+1);
inc = inc + (x+1);
if (z == array - 2)
{
switch(x)
{
case 1: inc = 52;
break;
case 2: inc = 38;
break;
case 3: inc = 34;
break;
case 4: inc = 32;
break;
case 5: inc = 31;
break;
case 6: inc = 30;
break;
case 7: inc = 29;
break;
case 8: inc = 29;
break;
case 9: inc = 28;
break;
}
}
}
}//void receiver
@Override
public void actionPerformed(ActionEvent e) {
}
}
是的,您可以在form4()
方法中訪問x
,因為x
是一個類字段,並且可以通過類中的任何方法訪問它。
但是,您在receiver()
方法中初始化x
,該方法在 form4()
之后執行。 當執行form4()
, x
未初始化(默認為0),因此您的數組將具有0大小。
要修復它,你可以將最后一行從form4()
到receiver()
如下所示:
public void form4()
{
...
add(okbutton);
}
public void receiver(String rlc)
{
x = Integer.parseInt(rlc);
parted = new JLabel[x]; // <--- now x is initialized
lite = 26/x;
...
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