问题：
其中一个Jbuttons的ActionListener没有被调用
关冠宇
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
@SuppressWarnings("serial")
public class Gui extends JFrame {
private ExpPanel panel1;
private Expression expression;
private ColorPanel panel2;
private SetValsPanel panel3;
int xIndex;
int cIndex;
public Gui(){
setLayout(new GridLayout(3,1,0,0));
panel1 = new ExpPanel();
panel2 = new ColorPanel();
panel3 = new SetValsPanel();
add(panel1);
add(panel2);
add(panel3);
panel1.setExp.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String temp = panel1.setExp.getText();
expression = new Expression(temp);
boolean[] isValid = expression.checkValid();
if(isValid[0]){
panel1.setExp.setText(expression.getExpression());
panel1.valid.setText("");
getContentPane().remove(panel2);
getContentPane().remove(panel3);
if (expression.getVars().length==0)
panel1.valid.setText("There's no variables in the entered expression.");
else if(expression.getVars().length==1){
panel3 = new SetValsPanel(expression);
add(panel3);
}
else {
panel2 = new ColorPanel(expression);
add(panel2);
}
}
else {
if(!isValid[1])
panel1.valid.setText("Invalid Expression (The prantheses don't match). Re-enter the expression." );
if(!isValid[3])
panel1.valid.setText("Invalid Expression (The expression must not continue after the last pranthes OR Invalid function name). Re-enter the expression." );
if(!isValid[2])
panel1.valid.setText("Invalid Expression (At least one argument of one of the functions is not entered). Re-enter the expression." );
if(!isValid[4])
panel1.valid.setText("Invalid Expression (You've entered two arguments for a single argument function). Re-enter the expression." );
getContentPane().remove(panel2);
getContentPane().remove(panel3);
}
validate();
repaint();
}
}
);
panel1.setbtn.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
System.out.println("in this shit");
String temp = panel1.setExp.getText();
expression = new Expression(temp);
boolean[] isValid = expression.checkValid();
if(isValid[0]){
panel1.setExp.setText(expression.getExpression());
panel1.valid.setText("");
getContentPane().remove(panel2);
getContentPane().remove(panel3);
if (expression.getVars().length==0)
panel1.valid.setText("There's no variables in the entered expression.");
else if(expression.getVars().length==1){
panel3 = new SetValsPanel(expression);
add(panel3);
}
else {
panel2 = new ColorPanel(expression);
add(panel2);
}
}
else {
if(!isValid[1])
panel1.valid.setText("Invalid Expression (The prantheses don't match or don't exist). Re-enter the expression." );
if(!isValid[3])
panel1.valid.setText("Invalid Expression (The expression must not continue after the last pranthes OR Invalid function name). Re-enter the expression." );
if(!isValid[2])
panel1.valid.setText("Invalid Expression (At least one argument of one of the functions is not entered). Re-enter the expression." );
if(!isValid[4])
panel1.valid.setText("Invalid Expression (You've entered two arguments for a single argument function). Re-enter the expression." );
getContentPane().remove(panel2);
getContentPane().remove(panel3);
}
validate();
repaint();
}
}
);
panel2.setbtn.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent arg1) {
if (panel2.cIndex == panel2.xIndex)
JOptionPane.showMessageDialog(null, "You can't choose the same variable for x-axis and color", "Error!", JOptionPane.ERROR_MESSAGE);
else {
String temp;
temp = expression.getVars()[xIndex];
expression.setVars(xIndex,expression.getVars()[0]);
expression.setVars(0,temp);
temp = expression.getVars()[cIndex];
expression.setVars(xIndex,expression.getVars()[1]);
expression.setVars(1,temp);
temp = null;
getContentPane().remove(panel3);
panel3 = new SetValsPanel(expression);
add(panel3);
validate();
repaint();
}
}
}
);
}
}
@SuppressWarnings("serial")
class ExpPanel extends JPanel{
String expression;
JTextField setExp;
JButton setbtn;
JLabel instruction;
JLabel valid;
boolean isValid;
public ExpPanel(){
setLayout(new GridLayout(2, 1, 5, 5));
setExp = new JTextField(10);
setbtn = new JButton("Set");
instruction = new JLabel("Enter Expression : ");
valid = new JLabel("", JLabel.CENTER);
JPanel up = new JPanel();
up.add(instruction,BorderLayout.WEST);
up.add(setExp,BorderLayout.CENTER);
up.add(setbtn,BorderLayout.EAST);
add(up);
add(valid);
}
}
@SuppressWarnings("serial")
class ColorPanel extends JPanel{
JButton setbtn = new JButton("Set");
JRadioButton[] xAxisbtns;
JRadioButton[] colorbtns;
int xIndex= -1;
int cIndex = -1;
public ColorPanel(){
}
public ColorPanel(Expression a){
int num = a.getVars().length;
xAxisbtns = new JRadioButton[num];
colorbtns = new JRadioButton[num];
ButtonGroup colorgroup = new ButtonGroup();
ButtonGroup axisgroup= new ButtonGroup();
setLayout( new GridLayout(4,1,0,0));
JLabel instr = new JLabel("Select the variables for x-Axis and Color : ",JLabel.CENTER);
JPanel cPanel = new JPanel();
JPanel xPanel = new JPanel();
cPanel.setLayout(new GridLayout(1, num + 1, 1, 1));
xPanel.setLayout(new GridLayout(1, num + 1, 1, 1));
cPanel.add(new JLabel("Select the variable for Color :",JLabel.CENTER));
xPanel.add(new JLabel("Select the variable for x-Axis :",JLabel.CENTER));
for(int i =0;i<num;i++){
xAxisbtns[i] = new JRadioButton(a.getVars()[i]);
colorbtns[i] = new JRadioButton(a.getVars()[i]);
colorgroup.add(colorbtns[i]);
axisgroup.add(xAxisbtns[i]);
xPanel.add(xAxisbtns[i]);
cPanel.add(colorbtns[i]);
xAxisbtns[i].addItemListener(new xhandler(i));
colorbtns[i].addItemListener(new chandler(i));
}
JPanel btnPanel = new JPanel();
btnPanel.add(setbtn,JPanel.LEFT_ALIGNMENT);
add(instr);
add(xPanel);
add(cPanel);
add(btnPanel);
}
private class xhandler implements ItemListener{
private int index;
@Override
public void itemStateChanged(ItemEvent arg0) {
xIndex = index;
}
public xhandler(int i){
index = i;
}
}
private class chandler implements ItemListener{
private int index;
@Override
public void itemStateChanged(ItemEvent arg0) {
cIndex = index;
}
public chandler(int i){
index = i;
}
}
}
@SuppressWarnings("serial")
class SetValsPanel extends JPanel{
JTextField[][] vals;
JButton drawIt = new JButton("Draw this shit");
JLabel[][] labels;
public SetValsPanel(){
drawIt.setEnabled(false);
}
public SetValsPanel(Expression a){
int num = a.getVars().length;
vals = new JTextField[3][num];
labels = new JLabel[3][num];
JPanel[] rows = new JPanel[num];
setLayout(new GridLayout(num+2,1,5,5));
add(new JLabel("Set the Range and the inital value for each variable : "));
for(int i=0;i<num;i++){
labels[0][i] = new JLabel("Range for " + a.getVars()[i] + " :",JLabel.CENTER);
labels[1][i] = new JLabel(" to ",JLabel.CENTER);
labels[2][i] = new JLabel(" Inital value = " + a.getVars()[i] + " :",JLabel.CENTER);
vals[0][i] = new JTextField(3);
vals[1][i] = new JTextField(3);
vals[2][i] = new JTextField(3);
rows[i] = new JPanel();
rows[i].setLayout(new GridLayout(1, 6, 2, 2));
rows[i].add(labels[0][i]);
rows[i].add(vals[0][i]);
rows[i].add(labels[1][i]);
rows[i].add(vals[1][i]);
if (i!=0) {
rows[i].add(labels[2][i]);
rows[i].add(vals[2][i]);
}
add(rows[i]);
}
add(drawIt);
}
}
public class Expression {
private String expression;
protected String[] vars;
private String[] varValues;
public Expression(String expression){
this.expression = ExpressionFunctions.toValid(expression);
vars = new String[0];
varValues = new String[0];
extractVars();
}
public void extractVars() {
String temp = expression;
temp = temp.toLowerCase();
String[] names1 = {"div\\(" , "idiv\\(" , "mod\\(" , "pow\\("};
String[] names2 = {"cotan\\(" , "arccos\\(" , "arccosh\\(" , "arcsinh\\(" , "cos\\(", "arccot\\(" , "arccoth\\(" ,
"arcsin\\(" , "arcsinh\\(" , "arccosh\\(", "arctanh\\(" , "cosh\\(" , "exp\\(" , "ln\\(", "fact\\(" ,
"fib\\(" , "sinh\\(" , "tanh\\(" };
for(String x : names1)
temp = temp.replaceAll(x, "add\\(");
for(String x : names2)
temp = temp.replaceAll(x, "sin\\(");
EvalExperession a = new EvalExperession(temp, vars, varValues);
boolean rep = true;
while (rep) {
try {
a.run();
rep = false;
} catch (IllegalArgumentException e) {
add(e.getMessage());
a = new EvalExperession(temp, vars, varValues);
}
}
}
private void add(String message) {
String[] temp1 = new String[vars.length];
String[] temp2 = new String[vars.length];
for(int i =0;i<vars.length;i++){
temp1[i] = vars[i];
temp2[i] = varValues[i];
}
vars = new String[temp1.length+1];
varValues = new String[temp2.length+1];
for(int i =0;i<temp1.length;i++){
varValues[i] = temp2[i];
vars[i] = temp1[i];}
vars[temp1.length] = message;
varValues[temp1.length] = "1.0";
temp1=null;
temp2 = null;
}
public String getExpression() {
return expression.toLowerCase();
}
public void setExpression(String expression) {
this.expression = expression;
}
public String[] getVars() {
return vars;
}
public void setVars(int i,String a) {
this.vars[i] = a;
}
public String[] getVarValues() {
return varValues;
}
public void setVarValues(String[] varValues) {
this.varValues = varValues;
}
public boolean[] checkValid(){
int right=0;
int left=0;
boolean[] res = new boolean[5];
for (int i =0;i<5;i++)
res[i] = true;
for (int i=0; i<expression.length(); i++){
if(expression.charAt(i) == '(')
left++;
if(expression.charAt(i) == ')')
right++;
if (right>left){
res[0] = false;
res[1] = false;
return res;}
}
if (right!=left || (right == 0 && left == 0))
{
res[0] = false;
res[1] = false;
return res;}
for (String x : vars){
if((x + "a").equals("a") || x.indexOf("(")!= -1 || x.indexOf(",")!= -1 || x.indexOf(")")!= -1){
if((x + "a").equals("a")){
res[0] = false;
res[2] = false;
return res;
}
if(x.indexOf("(")!= -1 || x.indexOf(")")!= -1 ){
res[0] = false;
res[3] = false;
return res;
}
if(x.indexOf(",")!= -1){
res[0] = false;
res[4] = false;
return res;
}
}
}
return res;
}
}
toValid函数只是更正一个字符串，您可以忽略它。
共有1个答案
方琦
这是我认为正在发生的事情。首先，使用ColorPanel（）创建一个ColorPanel，并将ActionListener添加到它的setbtn中。
然后，在顶部面板中输入表达式并按下其按钮后，使用ColorPanel（string）制作新的ColorPanel。但是，新ColorPanel中的新setbtn没有被赋予ActionListener。
可能的快速解决方案：向构造函数添加一个Button参数，并将旧的setbtn传递给新实例。那会又快又脏。
panel2 = new ColorPanel(expression, panel2.setbtn);
public ColorPanel(Expression a, JButton setbtn){
this.setbtn = setbtn;
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