我目前正在处理一些我正在研究的GUI计算器的问题。计算器编译并进行计算。要进行计算，您必须先输入一个数字，选择一个函数（+， - ，*或/），选择另一个数字，然后按等号。在执行等式后，必须先清除程序，然后再继续。我无法弄清楚如何制作它，以便程序在继续计算之前不需要按清除。我希望能够单击一个数字，单击+，单击一个数字，单击等于获得答案，然后再次按+以在等式中添加另一个数字。对此的任何帮助将不胜感激。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class GUICalc extends JPanel implements ActionListener {
private static final long serialVersionUID = 1L;
private JButton[] numberButtons;
private JButton[] upButtons;
private JTextField field;
private double num2, ans;
private int op;
// 0 = gridx 1 gridy 2 gridwidth 3 gridheight
private int[][] numConstraints = new int[][] {
{0, 4, 1, 1},
{0, 1, 1, 1},
{1, 1, 1, 1},
{2, 1, 1, 1},
{0, 2, 1, 1},
{1, 2, 1, 1},
{2, 2, 1, 1},
{0, 3, 1, 1},
{1, 3, 1, 1},
{2, 3, 1, 1},
};
private int[][] upConstraints = new int[][] {
{1, 4, 1, 1},
{3, 4, 1, 1},
{3, 3, 1, 1},
{3, 2, 1, 1},
{3, 1, 1, 1},
{0, 5, 4, 1},
{2, 4, 1, 1},
};
public GUICalc() {
setPreferredSize(new Dimension(666, 666)); //width & heigth
GridBagLayout layout; // used to be private
GridBagConstraints gbc; // used to be private
layout = new GridBagLayout();
layout.columnWidths = new int[] {60, 60, 60, 60};
layout.rowHeights = new int[] {60, 60, 60, 60, 60, 60};
setLayout(layout);
gbc = new GridBagConstraints();
numberButtons = new JButton[10];
numberButtons[0] = new JButton("0");
numberButtons[1] = new JButton("1");
numberButtons[2] = new JButton("2");
numberButtons[3] = new JButton("3");
numberButtons[4] = new JButton("4");
numberButtons[5] = new JButton("5");
numberButtons[6] = new JButton("6");
numberButtons[7] = new JButton("7");
numberButtons[8] = new JButton("8");
numberButtons[9] = new JButton("9");
for(int i = 0; i < numberButtons.length; i++){
gbc.gridx = numConstraints[i][0];
gbc.gridy = numConstraints[i][1];
gbc.gridwidth = numConstraints[i][2];
gbc.gridheight = numConstraints[1][3];
gbc.fill = GridBagConstraints.BOTH;
gbc.insets = new Insets(2, 2, 2, 2);
numberButtons[i].addActionListener(this);
add(numberButtons[i], gbc);
}
upButtons = new JButton[7];
upButtons[0] = new JButton(".");
upButtons[1] = new JButton("/");
upButtons[2] = new JButton("*");
upButtons[3] = new JButton("-");
upButtons[4] = new JButton("+");
upButtons[5] = new JButton("=");
upButtons[6] = new JButton("C");
for(int i = 0; i < upButtons.length; i++){
gbc.gridx = upConstraints[i][0];
gbc.gridy = upConstraints[i][1];
gbc.gridwidth = upConstraints[i][2];
gbc.gridheight = upConstraints[1][3];
gbc.insets = new Insets(2, 2, 2, 2);
upButtons[i].addActionListener(this);
add(upButtons[i], gbc);
}
field = new JTextField();
field.setBorder(BorderFactory.createLineBorder(Color.BLACK));
field.setEditable(false);
field.setFont(new Font("Arial",Font.PLAIN, 24));
field.setText(null);
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 4;
gbc.gridheight = 1;
add(field, gbc);
}
public static void main(String [] args){
JFrame frame = new JFrame("Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setLayout(new BorderLayout());
frame.add(new GUICalc(), BorderLayout.CENTER);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == numberButtons[0]){
field.setText(field.getText() + 0);
}
if(e.getSource() == numberButtons[1]){
field.setText(field.getText() + 1);
}
if(e.getSource() == numberButtons[2]){
field.setText(field.getText() + 2);
}
if(e.getSource() == numberButtons[3]){
field.setText(field.getText() + 3);
}
if(e.getSource() == numberButtons[4]){
field.setText(field.getText() + 4);
}
if(e.getSource() == numberButtons[5]){
field.setText(field.getText() + 5);
}
if(e.getSource() == numberButtons[6]){
field.setText(field.getText() + 6);
}
if(e.getSource() == numberButtons[7]){
field.setText(field.getText() + 7);
}
if(e.getSource() == numberButtons[8]){
field.setText(field.getText() + 8);
}
if(e.getSource() == numberButtons[9]){
field.setText(field.getText() + 9);
}
if(e.getSource() == upButtons[0] && !field.getText().contains(".")) {
field.setText(field.getText() + ".");
}
if(e.getSource() == upButtons[1]) {
ans = Integer.parseInt(field.getText());
op = 4;
field.setText("");
}
if(e.getSource() == upButtons[2]) {
ans = Integer.parseInt(field.getText());
op = 3;
field.setText("");
}
if(e.getSource() == upButtons[3]) {
ans = Integer.parseInt(field.getText());
op = 2;
field.setText("");
}
if(e.getSource() == upButtons[4]) {
ans = Integer.parseInt(field.getText());
op = 1;
field.setText("");
}
if(e.getSource() == upButtons[5]) {
num2 = Integer.parseInt(field.getText());
if(op == 1){
ans = ans + num2;
} else if(op == 2){
ans = ans - num2;
} else if(op == 3){
ans = ans * num2;
} else if(op == 4){
ans = ans / num2;
}
op = 0;
field.setText("" + ans);
}
if(e.getSource() == upButtons[6]) {
ans = 0.0;
field.setText("");
}
}
}
答案 0 :(得分：1)
您的程序存在的问题是您在双打上进行计算，但是您将文本解析为整数。将Integer.parseInt替换为Double.parseDouble，它将按您的意愿执行。
答案 1 :(得分：1)
/ *简单计算器已完成工作* /
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Calculator implements ActionListener
{
JFrame f;
JTextField tf;
JButton num[];
JButton btNum0;
JButton btEqual;
JButton btAdd;
JButton btSubtract;
JButton btMultiply;
JButton btDivide;
JButton btSolve;
JButton btClear;
JButton btDot;
JButton btExponent;
double TEMP;
double SolveTEMP;
String display="";
Boolean addBool = false ;
Boolean subBool = false ;
Boolean divBool = false ;
Boolean mulBool = false ;
Boolean expBool = false ;
Calculator(String s)
{
String number[]={"1","2","3","4","5","6","7","8","9"};
int m=0;
int x[]={30,80,130};
int y[]={205,155,105};
f=new JFrame(s);
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch(Exception e) {
System.out.println("Error setting native LAF: " + e);
}
JLabel l=new JLabel("Welcome To ZeeCalc Calculator.. :)");
l.setBounds(30,10,240,40);
f.add(l);
tf=new JTextField();
num=new JButton[number.length];
tf.setBounds(30,50,240,40);
f.add(tf);
tf.setEditable(false);
for(int j=0;j<x.length;j++)
{
for(int i=0;i<y.length;i++)
{
if(m<num.length)
{
num[m]=new JButton(String.valueOf(m+1));
num[m].setBounds(x[i],y[j],45,45);
f.add(num[m]);
}
m++;
}
}
btNum0=new JButton("0");
btNum0.setBounds(30,255,95,45);
f.add(btNum0);
btAdd=new JButton("+");
btAdd.setBounds(180,255,45,45);
f.add(btAdd);
btSubtract=new JButton("-");
btSubtract.setBounds(180,205,45,45);
f.add(btSubtract);
btMultiply=new JButton("*");
btMultiply.setBounds(180,155,45,45);
f.add(btMultiply);
btDot=new JButton(".");
btDot.setBounds(230,155,45,45);
f.add(btDot);
btDivide=new JButton("/");
btDivide.setBounds(180,105,45,45);
f.add(btDivide);
btExponent=new JButton("^");
btExponent.setBounds(230,105,45,45);
f.add(btExponent);
btSolve=new JButton("=");
btSolve.setBounds(230,205,45,95);
f.add(btSolve);
btClear=new JButton("C");
btClear.setBounds(130,255,45,45);
f.add(btClear);
m=0;
for(int i=0;i<x.length;i++)
{
for(int j=0;j<y.length;j++)
{
if(m<num.length)
{
num[m].addActionListener(this);
}
m++;
}
}
btNum0.addActionListener(this);
btAdd.addActionListener(this);
btSubtract.addActionListener(this);
btMultiply.addActionListener(this);
btDivide.addActionListener(this);
btSolve.addActionListener(new Operations());
btClear.addActionListener(this);
btDot.addActionListener(this);
btExponent.addActionListener(this);
f.setLayout(null);
f.setSize(310,360);
f.setVisible(true);
f.setResizable(false);
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==num[0])
{
display = tf.getText();
tf.setText(display + "1");
}
else if(e.getSource()==num[1])
{
display = tf.getText();
tf.setText(display + "2");
}
else if(e.getSource()==num[2])
{
display = tf.getText();
tf.setText(display + "3");
}
else if(e.getSource()==num[3])
{
display = tf.getText();
tf.setText(display + "4");
}
else if(e.getSource()==num[4])
{
display = tf.getText();
tf.setText(display + "5");
}
else if(e.getSource()==num[5])
{
display = tf.getText();
tf.setText(display + "6");
}
else if(e.getSource()==num[6])
{
display = tf.getText();
tf.setText(display + "7");
}
else if(e.getSource()==num[7])
{
display = tf.getText();
tf.setText(display + "8");
}
else if(e.getSource()==num[8])
{
display = tf.getText();
tf.setText(display + "9");
}
else if(e.getSource()==btNum0)
{
display = tf.getText();
tf.setText(display + "0");
}
else if(e.getSource()==btDot)
{
String dot=".";
display=tf.getText();
tf.setText(display+ ".");
}
else if(e.getSource()==btAdd)
{
TEMP=Double.parseDouble(tf.getText());
tf.setText("");
addBool=true;
}
else if(e.getSource()==btSubtract)
{
TEMP=Double.parseDouble(tf.getText());
tf.setText("");
subBool=true;
}
else if(e.getSource()==btMultiply)
{
TEMP=Double.parseDouble(tf.getText());
tf.setText("");
mulBool=true;
}
else if(e.getSource()==btDivide)
{
TEMP=Double.parseDouble(tf.getText());
tf.setText("");
divBool=true;
}
else if(e.getSource()==btExponent)
{
TEMP=Double.parseDouble(tf.getText());
tf.setText("");
expBool=true;
}
else if(e.getSource()==btClear)
{
tf.setText(null);
}
}
public static void main(String... r)
{
new Calculator("ZeeCalc Calculator");
}
class Operations implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
//double c=1;
SolveTEMP=Double.parseDouble( tf.getText() );
if(addBool==true )
{
SolveTEMP=SolveTEMP+TEMP;
}
else if(subBool==true)
{
SolveTEMP=TEMP-SolveTEMP;
}
else if(mulBool==true)
{
SolveTEMP=SolveTEMP*TEMP;
}
else if(divBool==true)
{
SolveTEMP=TEMP/SolveTEMP;
}
else if(expBool==true)
{
double a=TEMP,b=SolveTEMP;
SolveTEMP=1;
for(int i=0;i<b;i++)
{
SolveTEMP=SolveTEMP*TEMP;
}
}
tf.setText(Double.toString(SolveTEMP));
addBool = false ;
subBool = false ;
mulBool = false ;
divBool = false ;
expBool = false ;
}
}
}