代数系统2

代数系统2

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.table.DefaultTableModel;

public class commutation extends JFrame implements ActionListener{
JFrame frame;
JButton button;
JTable table;
JPanel p;
Label label;
static String[][] a;
public static void main(String args[]){
new commutation();
}
commutation(){
frame=new JFrame();
a=new String[6][6];
a[0][0]="O";a[0][1]="a";a[0][2]="b";a[0][3]="c";a[0][4]="d";a[0][5]="e";
a[1][0]="a";a[2][0]="b";a[3][0]="c";a[4][0]="d";a[5][0]="e";
String[] b={"","代","数","系","统",""};
DefaultTableModel myModel=new DefaultTableModel(a,b){
public boolean isCellEditable(int row,int col){
if(col==0||row==0) return false;
else return true;
}
};
table=new JTable(myModel);
table.setRowHeight(64);
table.getTableHeader().setReorderingAllowed(false);
JScrollPane scrollPane=new JScrollPane(table);
button=new JButton("判断该代数系统是否交换");
button.addActionListener(this);
label=new Label("");
p=new JPanel();
p.setLayout(new GridLayout(2,1));
p.add(button);
p.add(label);
frame.setTitle("离散数学");
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600,500);
frame.setVisible(true);
Container contentPane=frame.getContentPane();
contentPane.add(scrollPane,BorderLayout.CENTER);
contentPane.add(p,BorderLayout.SOUTH);
frame.setVisible(true);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==button){
if(table.isEditing()){
int row=table.getEditingRow();
int col=table.getEditingColumn();
table.getCellEditor(row,col).stopCellEditing();
}
for(int i=1;i<6;i++)
for(int j=1;j<6;j++){
if(table.getValueAt(i,j)==null) table.setValueAt("",i,j);
a[i][j]=(String)table.getValueAt(i,j);
}
if(check()) label.setText("该代数系统可交换");
else label.setText("该代数系统不可交换");
}
}
boolean check(){
int k=0;
outer: for(int i=1;i<=5;i++){
for(int j=1;j<=5;j++)
if(!a[i][j].equals(a[j][i])){
k=1;
break outer;
}
}
if(k==0) return true;
else return false;
}
}