问题
so i want to make this calculator i'm beginner so i dont know how to make calculations using = sign. i want to save first number in for example double temp and then save also second number an when i press = i want program to make proper operation so can you help me on simple language?
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Calculator {
public static void main(String[] args) {
JFrame frame = new JFrame("Calculator (BETA)");
frame.setSize(223, 250);
final TextField field1 = new TextField();
final JButton button1 = new JButton("1");
final JButton button2 = new JButton("2");
final JButton button3 = new JButton("3");
final JButton button4 = new JButton("4");
final JButton button5 = new JButton("5");
final JButton button6 = new JButton("6");
final JButton button7 = new JButton("7");
final JButton button8 = new JButton("8");
final JButton button9 = new JButton("9");
final JButton button0 = new JButton("0");
final JButton mul = new JButton("*");
final JButton div = new JButton("/");
final JButton equal = new JButton("=");
final JButton plus = new JButton("+");
final JButton minus = new JButton("-");
ActionListener but1 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s1 = button1.getText();
field1.setText(field1.getText() + s1);
}
};
button1.addActionListener(but1);
ActionListener but2 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s1 = button2.getText();
field1.setText(field1.getText() + s1); }
};
button2.addActionListener(but2);
ActionListener but3 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s1 = button3.getText();
field1.setText(field1.getText() + s1); }
};
button3.addActionListener(but3);
ActionListener but4 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s1 = button4.getText();
field1.setText(field1.getText() + s1); }
};
button4.addActionListener(but4);
ActionListener but5 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s1 = button5.getText();
field1.setText(field1.getText() + s1); }
};
button5.addActionListener(but5);
ActionListener but6 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s1 = button6.getText();
field1.setText(field1.getText() + s1); }
};
button6.addActionListener(but6);
ActionListener but7 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s1 = button7.getText();
field1.setText(field1.getText() + s1); }
};
button7.addActionListener(but7);
ActionListener but8 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s1 = button8.getText();
field1.setText(field1.getText() + s1); }
};
button8.addActionListener(but8);
ActionListener but9 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s1 = button9.getText();
field1.setText(field1.getText() + s1); }
};
button9.addActionListener(but9);
ActionListener but0 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String s1 = button0.getText();
field1.setText(field1.getText() + s1); }
};
button0.addActionListener(but0);
ActionListener mult = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String num = field1.getText();
int i1 = Integer.parseInt(num);
field1.setText(null);
}
};
mul.addActionListener(mult);
ActionListener equals = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
String num = field1.getText();
int i1 = Integer.parseInt(num);
}
};
equal.addActionListener(equals);
//Adding Items To Frame And Setting Bounds
frame.setLayout(null);
field1.setBounds(10, 10, 193, 22);
button1.setBounds(10, 52, 43, 37);
button2.setBounds(60, 52, 43, 37);
button3.setBounds(110, 52, 43, 37);
button4.setBounds(10, 95, 43, 37);
button5.setBounds(60, 95, 43, 37);
button6.setBounds(110, 95, 43, 37);
button7.setBounds(10, 138, 43, 37);
button8.setBounds(60, 138, 43, 37);
button9.setBounds(110, 138, 43, 37);
button0.setBounds(10, 181, 43, 37);
div.setBounds(60, 181, 43, 37);
plus.setBounds(160, 52, 43, 37);
mul.setBounds(110, 181, 43, 37);
equal.setBounds(160, 138, 43, 80);
minus.setBounds(160, 95, 43, 37);
frame.add(field1);
frame.add(button1);
frame.add(button2);
frame.add(button3);
frame.add(button4);
frame.add(button5);
frame.add(button6);
frame.add(button7);
frame.add(button8);
frame.add(button9);
frame.add(button0);
frame.add(div);
frame.add(equal);
frame.add(mul);
frame.add(plus);
frame.add(minus);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
}
}
回答1:
check here Simple calculator and Calculator
(Search for Simple Calculator in the post and you will get the idea for your calculator)
来源：https://stackoverflow.com/questions/17259401/java-calculator-gui