所以我想编写一个tictactoe，当我创建吸气剂和吸气剂时，他们没有给我变量。我查了一下它们可能有什么问题，但没有找到错误。我希望有人能向我解释什么地方错了。它只是关于设置面板并将其取回并设置字符串并将其取回。我是编程新手，如果有人可以帮助我解决这个问题，我将不胜感激。
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.JButton;
import javax.swing.JFrame;
/**
* @author Anid Memisi
*
* @date 21.02.2020
*
* @version 1.0
*/
public class TicTacToe {
public void tictactoe() {
//basic constructor
TicTacToe t = new TicTacToe();
t.GridLayout();
}
public void Entscheid() {
TicTacToe t = new TicTacToe();
t.Update();
}
public void Update() {
Setter_and_Getter s = new Setter_and_Getter();
String feldI=s.getFeldi();
JPanel panel=s.getPanel();
System.out.print(feldI);
System.out.print(panel);
String[] feld = new String[] {" "," "," "," "," "," "," "," "," "};
feld[0] = feldI;
System.out.print(feldI);
if(!feldI.equals(" ")){
if(panel != null) {
panel.removeAll();
panel.invalidate();
panel.repaint();
}
panel.setLayout(new GridLayout(3, 3));
//creates the tiles for the tictactoe
JButton button1 = new JButton(feld[0]);
JButton button2 = new JButton(feld[1]);
JButton button3 = new JButton(feld[2]);
JButton button4 = new JButton(feld[3]);
JButton button5 = new JButton(feld[4]);
JButton button6 = new JButton(feld[5]);
JButton button7 = new JButton(feld[6]);
JButton button8 = new JButton(feld[7]);
JButton button9 = new JButton(feld[8]);
panel.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(button4);
panel.add(button5);
panel.add(button6);
panel.add(button7);
panel.add(button8);
panel.add(button9);
panel.revalidate();
panel.repaint();
panel.requestFocus();
}
}
public void GridLayout() {
TicTacToe t = new TicTacToe();
Setter_and_Getter s = new Setter_and_Getter();
String[] feld = new String[] {" "," "," "," "," "," "," "," "," "};
JFrame frame = new JFrame("Grid Layout");
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600,600);
JPanel panel = new JPanel();
//creates the tiles for the tictactoe
panel.setLayout(new GridLayout(3,3));
JButton button1 = new JButton(feld[0]);
JButton button2 = new JButton(feld[1]);
JButton button3 = new JButton(feld[2]);
JButton button4 = new JButton(feld[3]);
JButton button5 = new JButton(feld[4]);
JButton button6 = new JButton(feld[5]);
JButton button7 = new JButton(feld[6]);
JButton button8 = new JButton(feld[7]);
JButton button9 = new JButton(feld[8]);
panel.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(button4);
panel.add(button5);
panel.add(button6);
panel.add(button7);
panel.add(button8);
panel.add(button9);
frame.add(panel);
s.setPanel(panel);
//sends the input to the listener
DerHandler handler = new DerHandler();
button1.addActionListener(handler);
DerHandler2 handler2 = new DerHandler2();
button2.addActionListener(handler2);
DerHandler3 handler3 = new DerHandler3();
button3.addActionListener(handler3);
DerHandler4 handler4 = new DerHandler4();
button4.addActionListener(handler4);
DerHandler5 handler5 = new DerHandler5();
button5.addActionListener(handler5);
DerHandler6 handler6 = new DerHandler6();
button6.addActionListener(handler6);
DerHandler7 handler7 = new DerHandler7();
button7.addActionListener(handler7);
DerHandler8 handler8 = new DerHandler8();
button8.addActionListener(handler8);
DerHandler9 handler9 = new DerHandler9();
button9.addActionListener(handler9);
}
private class DerHandler implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
TicTacToe t = new TicTacToe();
Setter_and_Getter s = new Setter_and_Getter();
String feldI =" ";
//gets the text of the tile
Object source = e.getSource();
//compares it
if (source instanceof JButton) {
feldI = "1";
}
s.setFeldI(feldI);
System.out.print(feldI);
t.Entscheid();
}
}
private class DerHandler2 implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
TicTacToe t = new TicTacToe();
Setter_and_Getter s = new Setter_and_Getter();
String feldI =" ";
//gets the text of the tile
Object source = e.getSource();
//compares it
if (source instanceof JButton) {
feldI = "2";
}
s.setFeldI(feldI);
System.out.print(feldI);
t.Entscheid();
}
}
private class DerHandler3 implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
TicTacToe t = new TicTacToe();
Setter_and_Getter s = new Setter_and_Getter();
String feldI =" ";
//gets the text of the tile
Object source = e.getSource();
//compares it
if (source instanceof JButton) {
feldI = "3";
}
s.setFeldI(feldI);
System.out.print(feldI);
t.Entscheid();
}
}
private class DerHandler4 implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
TicTacToe t = new TicTacToe();
Setter_and_Getter s = new Setter_and_Getter();
String feldI =" ";
//gets the text of the tile
Object source = e.getSource();
//compares it
if (source instanceof JButton) {
feldI = "4";
}
s.setFeldI(feldI);
System.out.print(feldI);
t.Entscheid();
}
}
private class DerHandler5 implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
TicTacToe t = new TicTacToe();
Setter_and_Getter s = new Setter_and_Getter();
String feldI =" ";
//gets the text of the tile
Object source = e.getSource();
//compares it
if (source instanceof JButton) {
feldI = "5";
}
s.setFeldI(feldI);
System.out.print(feldI);
t.Entscheid();
}
}
private class DerHandler6 implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
TicTacToe t = new TicTacToe();
Setter_and_Getter s = new Setter_and_Getter();
String feldI =" ";
//gets the text of the tile
Object source = e.getSource();
//compares it
if (source instanceof JButton) {
feldI = "6";
}
s.setFeldI(feldI);
System.out.print(feldI);
t.Entscheid();
}
}
private class DerHandler7 implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
TicTacToe t = new TicTacToe();
Setter_and_Getter s = new Setter_and_Getter();
String feldI =" ";
//gets the text of the tile
Object source = e.getSource();
//compares it
if (source instanceof JButton) {
feldI = "7";
}
s.setFeldI(feldI);
System.out.print(feldI);
t.Entscheid();
}
}
private class DerHandler8 implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
TicTacToe t = new TicTacToe();
Setter_and_Getter s = new Setter_and_Getter();
String feldI =" ";
//gets the text of the tile
Object source = e.getSource();
//compares it
if (source instanceof JButton) {
feldI = "8";
}
s.setFeldI(feldI);
System.out.print(feldI);
t.Entscheid();
}
}
private class DerHandler9 implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
TicTacToe t = new TicTacToe();
Setter_and_Getter s = new Setter_and_Getter();
String feldI =" ";
//gets the text of the tile
Object source = e.getSource();
//compares it
if (source instanceof JButton) {
feldI = "9";
}
s.setFeldI(feldI);
System.out.print(feldI);
t.Entscheid();
}
}
public static void main(String[] args) {
TicTacToe t = new TicTacToe();
t.tictactoe();
}
}
import javax.swing.*;
public class Setter_and_Getter {
private String feldI;
private JPanel panel;
public void setFeldI(String feldI){
this.feldI=feldI;
}
public void setPanel(JPanel panel){
this.panel=panel;
}
public String getFeldi(){
return this.feldI;
}
public JPanel getPanel(){
return this.panel;
}
}
在每个actionPerformed（）方法中，创建Setter_and_Getter的新实例并设置一个值。在这些方法的最后，方法的作用域结束了，因此Setter_and_Getter对象被垃圾收集器删除。
因此，以后没有办法访问这些对象实例。
在您的Update（）方法中，再次创建一个Setter_and_Getter的新实例，并读取两个重视。吸气剂返回null，因为这些值实际上为null。您之前没有调用该对象实例的任何设置方法。
您需要将对象实例存储在方法之外的某个位置，然后从以前填充的实例中读取，而不是读取一个新的空实例。
顺便说一句：您应该对TicTacToe类的所有方法使用小写字母名称。大写名称按照惯例指示类名称。