有没有办法在不同的区域（在注释中由 %%% 标记）访问变量（示例由旁边的 *** 组成的注释标记）。我已经四处寻找方法来做到这一点，但无法真正找到任何东西或充分理解它。
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.concurrent.ThreadLocalRandom;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Program extends Display {
private static final long serialVersionUID = 1L;
public static void main(String[] args) {
Display display = new Display();
display.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
display.setSize(1600, 800);
display.setResizable(false);
//-------------------------------------------------------------------
//Main Menu
JButton select = new JButton("Select");
select.setPreferredSize(new Dimension(400,100));
select.setFont(new Font("Arial", Font.PLAIN, 40));
JButton absent = new JButton("Absentees");
absent.setPreferredSize(new Dimension(400,100));
absent.setFont(new Font("Arial", Font.PLAIN, 40));
JButton exit = new JButton("Exit");
exit.setPreferredSize(new Dimension(400,100));
exit.setFont(new Font("Arial", Font.PLAIN, 40));
exit.setLocation(800, 700);
exit.setBackground(Color.red);
exit.setForeground(Color.white);
JButton select1 = new JButton("Select 1");
JButton select2 = new JButton("Select 2");
JButton select3 = new JButton("Select 3");
JButton select4 = new JButton("Select 4");
JButton select5 = new JButton("Select 5");
JButton RS1 = new JButton();
JButton back = new JButton("Back");
back.setPreferredSize(new Dimension(400,100));
back.setFont(new Font("Arial", Font.PLAIN, 40));
select1.setPreferredSize(new Dimension(400,100));
select1.setFont(new Font("Arial", Font.PLAIN, 40));
RS1.setFont(new Font("Arial", Font.PLAIN, 40));
RS1.setPreferredSize(new Dimension(400,100));
RS1.setFont(new Font("Arial", Font.PLAIN, 40));
RS1.setVisible(false);
RS1.setOpaque(false);
RS1.setContentAreaFilled(false);
RS1.setBorderPainted(false);
RS1.setVisible(false);
RS1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}});
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
select1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
RS1.setVisible(true);
int select1student1 = ThreadLocalRandom.current().nextInt(1, 10 + 1);
if (select1student1 == 1) {
RS1.setText("Student One");
}
if (select1student1 == 2) {
RS1.setText("Student Two");
}
if (select1student1 == 3) {
RS1.setText("Student Three");
}
if (select1student1 == 4) {
RS1.setText("Student Four");
}
if (select1student1 == 5) {
RS1.setText("Student Five");
}
if (select1student1 == 6) {
RS1.setText("Student Six");
}
if (select1student1 == 7) {
RS1.setText("Student Seven");
}
if (select1student1 == 8) {
RS1.setText("Student Eight");
}
if (select1student1 == 9) {
RS1.setText("Student Nine");
}
if (select1student1 == 10) {
RS1.setText("Student Ten");
}
}});
select2.setPreferredSize(new Dimension(400,100));
select2.setFont(new Font("Arial", Font.PLAIN, 40));
select2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}});
select3.setPreferredSize(new Dimension(400,100));
select3.setFont(new Font("Arial", Font.PLAIN, 40));
select3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}});
select4.setPreferredSize(new Dimension(400,100));
select4.setFont(new Font("Arial", Font.PLAIN, 40));
select4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}});
select5.setPreferredSize(new Dimension(400,100));
select5.setFont(new Font("Arial", Font.PLAIN, 40));
select5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}});
select.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
select.setVisible(false);
absent.setVisible(false);
exit.setVisible(false);
display.remove(select);
display.remove(absent);
display.remove(exit);
back.setVisible(true);
display.add(back);
display.add(select1);
display.add(select2);
display.add(select3);
display.add(select4);
display.add(select5);
display.add(RS1);
select1.setVisible(true);
select2.setVisible(true);
select3.setVisible(true);
select4.setVisible(true);
select5.setVisible(true);
back.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
RS1.setText("");
RS1.setVisible(false);
display.add(select);
display.add(absent);
display.add(exit);
display.remove(back);
select1.setVisible(false);
select2.setVisible(false);
select3.setVisible(false);
select4.setVisible(false);
select5.setVisible(false);
select.setVisible(true);
display.remove(select1);
display.remove(select2);
display.remove(select3);
display.remove(select4);
display.remove(select5);
absent.setVisible(true);
exit.setVisible(true);
back.setVisible(false);
}
});
}});
//Mark Absents
//
//
//
//
absent.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JButton back = new JButton("Back");
back.setPreferredSize(new Dimension(350,100));
back.setFont(new Font("Arial", Font.PLAIN, 40));
//Mark The Absentees Below
JButton AB1 = new JButton("Student 1");
AB1.setPreferredSize(new Dimension(350,100));
AB1.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB2 = new JButton("Student 2");
AB2.setPreferredSize(new Dimension(350,100));
AB2.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB3 = new JButton("Student 3");
AB3.setPreferredSize(new Dimension(350,100));
AB3.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB4 = new JButton("Student 4");
AB4.setPreferredSize(new Dimension(350,100));
AB4.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB5 = new JButton("Student 5");
AB5.setPreferredSize(new Dimension(350,100));
AB5.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB6 = new JButton("Student 6");
AB6.setPreferredSize(new Dimension(350,100));
AB6.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB7 = new JButton("Student 7");
AB7.setPreferredSize(new Dimension(350,100));
AB7.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB8 = new JButton("Student 8");
AB8.setPreferredSize(new Dimension(350,100));
AB8.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB9 = new JButton("Student 9");
AB9.setPreferredSize(new Dimension(350,100));
AB9.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB10 = new JButton("Student 10");
AB10.setPreferredSize(new Dimension(350,100));
AB10.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB11 = new JButton("Student 11");
AB11.setPreferredSize(new Dimension(350,100));
AB11.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB12 = new JButton("Student 12");
AB12.setPreferredSize(new Dimension(350,100));
AB12.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB13 = new JButton("Student 13");
AB13.setPreferredSize(new Dimension(350,100));
AB13.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB14 = new JButton("Student 14");
AB14.setPreferredSize(new Dimension(350,100));
AB14.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB15 = new JButton("Student 15");
AB15.setPreferredSize(new Dimension(350,100));
AB15.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB16 = new JButton("Student 16");
AB16.setPreferredSize(new Dimension(350,100));
AB16.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB17 = new JButton("Student 17");
AB17.setPreferredSize(new Dimension(350,100));
AB17.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB18 = new JButton("Student 18");
AB18.setPreferredSize(new Dimension(350,100));
AB18.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB19 = new JButton("Student 19");
AB19.setPreferredSize(new Dimension(350,100));
AB19.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB20 = new JButton("Student 20");
AB20.setPreferredSize(new Dimension(350,100));
AB20.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB21 = new JButton("Student 21");
AB21.setPreferredSize(new Dimension(350,100));
AB21.setFont(new Font("Arial", Font.PLAIN, 40));
JButton AB22 = new JButton("Student 22");
AB22.setPreferredSize(new Dimension(350,100));
AB22.setFont(new Font("Arial", Font.PLAIN, 40));
AB1.setBackground(Color.green);
AB2.setBackground(Color.green);
AB3.setBackground(Color.green);
AB4.setBackground(Color.green);
AB5.setBackground(Color.green);
AB6.setBackground(Color.green);
AB7.setBackground(Color.green);
AB8.setBackground(Color.green);
AB9.setBackground(Color.green);
AB10.setBackground(Color.green);
AB11.setBackground(Color.green);
AB12.setBackground(Color.green);
AB13.setBackground(Color.green);
AB14.setBackground(Color.green);
AB15.setBackground(Color.green);
AB16.setBackground(Color.green);
AB17.setBackground(Color.green);
AB18.setBackground(Color.green);
AB19.setBackground(Color.green);
AB20.setBackground(Color.green);
AB21.setBackground(Color.green);
AB22.setBackground(Color.green);
select.setVisible(false);
absent.setVisible(false);
exit.setVisible(false);
display.remove(select);
display.remove(absent);
display.remove(exit);
back.setVisible(true);
display.add(back);
display.add(AB1);
display.add(AB2);
display.add(AB3);
display.add(AB4);
display.add(AB5);
display.add(AB6);
display.add(AB7);
display.add(AB8);
display.add(AB9);
display.add(AB10);
display.add(AB11);
display.add(AB12);
display.add(AB13);
display.add(AB14);
display.add(AB15);
display.add(AB16);
display.add(AB17);
display.add(AB18);
display.add(AB19);
display.add(AB20);
display.add(AB21);
display.add(AB22);
AB1.addActionListener(new ActionListener() {
//********************************************************************
String AB1Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB1Status) {
case "Present": AB1.setBackground(Color.red);
AB1Status = "Absent"; break;
case "Absent": AB1.setBackground(Color.green);
AB1Status = "Present"; break;
}}});
AB2.addActionListener(new ActionListener() {
String AB2Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB2Status) {
case "Present": AB2.setBackground(Color.red);
AB2Status = "Absent"; break;
case "Absent": AB2.setBackground(Color.green);
AB2Status = "Present"; break;
}}});
AB3.addActionListener(new ActionListener() {
String AB3Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB3Status) {
case "Present": AB3.setBackground(Color.red);
AB3Status = "Absent"; break;
case "Absent": AB3.setBackground(Color.green);
AB3Status = "Present"; break;
}}});
AB4.addActionListener(new ActionListener() {
String AB4Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB4Status) {
case "Present": AB4.setBackground(Color.red);
AB4Status = "Absent"; break;
case "Absent": AB4.setBackground(Color.green);
AB4Status = "Present"; break;
}}});
AB5.addActionListener(new ActionListener() {
String AB5Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB5Status) {
case "Present": AB5.setBackground(Color.red);
AB5Status = "Absent"; break;
case "Absent": AB5.setBackground(Color.green);
AB5Status = "Present"; break;
}}});
AB6.addActionListener(new ActionListener() {
String AB6Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB6Status) {
case "Present": AB6.setBackground(Color.red);
AB6Status = "Absent"; break;
case "Absent": AB6.setBackground(Color.green);
AB6Status = "Present"; break;
}}});
AB7.addActionListener(new ActionListener() {
String AB7Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB7Status) {
case "Present": AB7.setBackground(Color.red);
AB7Status = "Absent"; break;
case "Absent": AB7.setBackground(Color.green);
AB7Status = "Present"; break;
}}});
AB8.addActionListener(new ActionListener() {
String AB8Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB8Status) {
case "Present": AB8.setBackground(Color.red);
AB8Status = "Absent"; break;
case "Absent": AB8.setBackground(Color.green);
AB8Status = "Present"; break;
}}});
AB9.addActionListener(new ActionListener() {
String AB9Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB9Status) {
case "Present": AB9.setBackground(Color.red);
AB9Status = "Absent"; break;
case "Absent": AB9.setBackground(Color.green);
AB9Status = "Present"; break;
}}});
AB10.addActionListener(new ActionListener() {
String AB10Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB10Status) {
case "Present": AB10.setBackground(Color.red);
AB10Status = "Absent"; break;
case "Absent": AB10.setBackground(Color.green);
AB10Status = "Present"; break;
}}});
AB11.addActionListener(new ActionListener() {
String AB11Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB11Status) {
case "Present": AB11.setBackground(Color.red);
AB11Status = "Absent"; break;
case "Absent": AB11.setBackground(Color.green);
AB11Status = "Present"; break;
}}});
AB12.addActionListener(new ActionListener() {
String AB12Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB12Status) {
case "Present": AB12.setBackground(Color.red);
AB12Status = "Absent"; break;
case "Absent": AB12.setBackground(Color.green);
AB12Status = "Present"; break;
}}});
AB13.addActionListener(new ActionListener() {
String AB13Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB13Status) {
case "Present": AB13.setBackground(Color.red);
AB13Status = "Absent"; break;
case "Absent": AB13.setBackground(Color.green);
AB13Status = "Present"; break;
}}});
AB14.addActionListener(new ActionListener() {
String AB14Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB14Status) {
case "Present": AB14.setBackground(Color.red);
AB14Status = "Absent"; break;
case "Absent": AB14.setBackground(Color.green);
AB14Status = "Present"; break;
}}});
AB15.addActionListener(new ActionListener() {
String AB15Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB15Status) {
case "Present": AB15.setBackground(Color.red);
AB15Status = "Absent"; break;
case "Absent": AB15.setBackground(Color.green);
AB15Status = "Present"; break;
}}});
AB16.addActionListener(new ActionListener() {
String AB16Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB16Status) {
case "Present": AB16.setBackground(Color.red);
AB16Status = "Absent"; break;
case "Absent": AB16.setBackground(Color.green);
AB16Status = "Present"; break;
}}});
AB17.addActionListener(new ActionListener() {
String AB17Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB17Status) {
case "Present": AB17.setBackground(Color.red);
AB17Status = "Absent"; break;
case "Absent": AB17.setBackground(Color.green);
AB17Status = "Present"; break;
}}});
AB18.addActionListener(new ActionListener() {
String AB18Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB18Status) {
case "Present": AB18.setBackground(Color.red);
AB18Status = "Absent"; break;
case "Absent": AB18.setBackground(Color.green);
AB18Status = "Present"; break;
}}});
AB19.addActionListener(new ActionListener() {
String AB19Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB19Status) {
case "Present": AB19.setBackground(Color.red);
AB19Status = "Absent"; break;
case "Absent": AB19.setBackground(Color.green);
AB19Status = "Present"; break;
}}});
AB20.addActionListener(new ActionListener() {
String AB20Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB20Status) {
case "Present": AB20.setBackground(Color.red);
AB20Status = "Absent"; break;
case "Absent": AB20.setBackground(Color.green);
AB20Status = "Present"; break;
}}});
AB21.addActionListener(new ActionListener() {
String AB21Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB21Status) {
case "Present": AB21.setBackground(Color.red);
AB21Status = "Absent"; break;
case "Absent": AB21.setBackground(Color.green);
AB21Status = "Present"; break;
}}});
AB22.addActionListener(new ActionListener() {
String AB22Status = "Present";
public void actionPerformed(ActionEvent e) {
switch(AB22Status) {
case "Present": AB22.setBackground(Color.red);
AB22Status = "Absent"; break;
case "Absent": AB22.setBackground(Color.green);
AB22Status = "Present"; break;
}}});
back.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
display.add(select);
display.add(absent);
display.add(exit);
AB1.setVisible(false);
AB2.setVisible(false);
AB3.setVisible(false);
AB4.setVisible(false);
AB5.setVisible(false);
AB6.setVisible(false);
AB7.setVisible(false);
AB8.setVisible(false);
AB9.setVisible(false);
AB10.setVisible(false);
AB11.setVisible(false);
AB12.setVisible(false);
AB13.setVisible(false);
AB14.setVisible(false);
AB15.setVisible(false);
AB16.setVisible(false);
AB17.setVisible(false);
AB18.setVisible(false);
AB19.setVisible(false);
AB20.setVisible(false);
AB21.setVisible(false);
AB22.setVisible(false);
select.setVisible(true);
display.remove(back);
display.remove(AB1);
display.remove(AB2);
display.remove(AB3);
display.remove(AB4);
display.remove(AB5);
display.remove(AB6);
display.remove(AB7);
display.remove(AB8);
display.remove(AB9);
display.remove(AB10);
display.remove(AB11);
display.remove(AB12);
display.remove(AB13);
display.remove(AB14);
display.remove(AB15);
display.remove(AB16);
display.remove(AB17);
display.remove(AB18);
display.remove(AB19);
display.remove(AB20);
display.remove(AB21);
display.remove(AB22);
display.remove(back);
absent.setVisible(true);
exit.setVisible(true);
back.setVisible(false);
}});
}});
exit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}});
display.setVisible(true);
display.add(select);
display.add(absent);
display.add(exit);
}}